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20 June 2015, Volume 29 Issue 3 Previous Issue    Next Issue

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Protection Measures and Study on the Effect of Tunnel Boring Adjacent to Bridge Pile Foundation CHEN Hui 2015, 29 (3):  1-05.  Abstract ( 1503 )   Save This paper presents a case study is of Zhengzhou No.3 Metro Line Tunnel Boring adjacent to the pile foundation of a highspeed railway bridge. The Fast Lagrange finite difference code was adopted to calculate the impact of tunnel boring on the pile foundation. The results suggest that: the construction will induce additional vertical deformation and horizontal bending moment. This impact can be mitigated by the construction of isolation piles. Related Articles | Metrics

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Treatment and Monitoring on Seepage of Vertical Shaft Supported by Vertical Anchor-jetting during Underground Passage Construction YAO Hucheng1，GUO Zhenkun1，LIU Guanshi2 2015, 29 (3):  6-09.  Abstract ( 2080 )   Save The vertical shaft is an important component in the construction of the underground pedestrian pass in urban areas and its safe installation is essential to the success of the underpass construction. The construction of the underground pass at Wusheng Road East in Wuhan utilized the ground anchors with shotcrete as the vertical support measure. The steady seepage at the shaft walls and a sudden ground subsidence were encountered during the construction. The local grouting and other seepage stoppage measures were used based on the construction monitoring data on the extensometers and surface settlement points. The results indicate that the mitigation measures are appropriate. The construction monitoring can provide a viable and reliable feedback of the construction, and is a vital measure to a safe construction of underground pedestrian pass. Related Articles | Metrics

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The Landslide Stability Analysis and Treatment Measures of K1661+370~420 on National Road 209 GONG Yong1，FU Guijun2，REN Weizhong2 2015, 29 (3):  10-13.  Abstract ( 1864 )   Save The landslide between Station K1661+370 and 420 of State Route 209 is located in Xingshan County, Yichang City. This ancient landslide was reactivated by the excessive precipitation. The landslide mechanisms are discussed based on the thorough understanding of the site geological conditions. The main triggering factors identified are: expansion of the fissures; precipitations; and human activities. The sliding body was evaluated with the limit equilibrium method. The mitigation measures are a combination of railtrack pile supported retaining wall with the surface drainage.  The construction results indicate that the landside treatment measure is successful. Related Articles | Metrics

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Groundwater Gushing in the Cast-In-Place Concrete Pile Installations in Mountain Terrains WU Qun1，KONG Hailong2 2015, 29 (3):  14-15.  Abstract ( 1360 )   Save  Geotechnical investigations in the mountain terrains should thoroughly inspect the environmental geology conditions in surrounding areas. Layered groundwater observations might be necessary for areas that the artisan groundwater levels are suspected. As a case history, this paper presents that, in the castinplace concrete pile installation site, large quantities of groundwater were gushing into the boreholes. The groundwater gushing mechanism was investigated, and cost effective mitigation measures were provided. Related Articles | Metrics

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Anchoring Failure in the Prefabricated Vertical Drain Installations YUAN Cheng 2015, 29 (3):  16-19.  Abstract ( 1161 )   Save The Prefabricated Vertical Drain (PVD) is a conventional and effective ground improvement method for thick soft cohesive soils, but the anchoring failures are frequently encountered during the PVD installations. These anchoring failures affect the quality of the construction and will increase the cost if several PVDs are inserted adjacent to the failed one. This paper presents a case history of PVD installations in Zhuhai Cross Gate No. 6 bid package project. The anchoring failure during the installation was analyzed and improving method was proposed and the improved procedure effectively reduced the anchoring failure rate. Related Articles | Metrics

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Deep Excavation Dewatering in Suzhou Soil with Silt Lenses LI　Suchun，PU Chunlin 2015, 29 (3):  20-22.  Abstract ( 1039 )   Save In the deep excavation practice in the urban area of Suzhou City, the slightly artesian silt lenses are frequently encountered. The success of the dewatering in this layer is critical to the smoothness of the entire deep excavation project. This paper resents a case study of the deep excavation project. The material components, water bearing characteristics and the selection of the dewatering scheme are discussed. The use of small well point groups is a feasible and cost effective solution in these soils.    Related Articles | Metrics

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Post Grouted Cast-In-Place Concrete Piles CHEN Jinsong1，CHEN Xinsong2 2015, 29 (3):  23-25.  Abstract ( 1147 )   Save The castinplace concrete pile was designed to have pile tip into the medium weathered clayey silty sandstone stratum and it was value engineered during the construction. The pile tip was shortened up to gravelly sand and post grouted in order to improve the axial capacity. The static load test indicated that the shortened and post grouted pile have a higher axial capacity than that of the original design value. The total pile length was able to be reduced by 14 meters. Each pile can save cost of 5,208 RMB. Related Articles | Metrics

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Monitoring Ａnalysis and Ｄesign of Foundation Excavations Support Project Close to the Subway DAI Zhonghai 2015, 29 (3):  26-29.  Abstract ( 1602 )   Save To ensure the safety operation, the deep excavations adjacent to the subway metro needs to impose a strict deformation requirement in the design and construction. This paper presents a case history of the deep excavation support of the west tower of Baidu International Building. The engineering and design of the building are briefed and the construction monitoring data are analyzed. The results indicate that support selection was adequate and the support scheme is also cost effective. Related Articles | Metrics

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Effect of the Construction of the  Logistics Park in Shiyan City on a Xiangyu Second Line Tunnel MENG Xianglong 2015, 29 (3):  30-33.  Abstract ( 1372 )   Save The Lin'an Logistics Park in Shiyan City is now under construction. When it is completed, it will be the largest automobile accessary supply center in Asia. The Fulongkou No. 2 Tunnel, which is the tunnel for the existing Xiangyu Second Rail Line, is underneath the park. The effect of the logistic park construction on the safety of operation of the railway tunnel is studied in this paper. The impact of the construction activities of the park on the stability of the tunnel is numerically simulated. The results indicate that the proposed building has minimal impact on the existing tunnel, however, the proposed earthwork (fill) will has a significant impact on the stability of the tunnel. It is suggested that constructing the arch structure or using the sheet pile wall to spread the vertical fill load to both sides of the tunnel if the fill operation has to be conducted.   Related Articles | Metrics

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Dewatering of the Deep Excavation for a High Rise Building WANG Jiang1，YANG Zhi2 2015, 29 (3):  34-37.  Abstract ( 1247 )   Save  This paper presents a case history of the deep excavation dewatering for a highrise building in the Sunshine New Town Residential Community development. The site dewatering influence radius as well as the comprehensive coefficient of the site were determined from the site specific geological and hydrological conditions. Then well point dewatering design was able to be performed and the well point distribution can be determined by using a zoned complete submerged well model. The construction results indicated that the number of well points as well as the spacing of the well points could meet the design as well as code requirements. The safety construction of the deep excavation and the foundation work can be ensured. The combination of the closed rectangular well system with the double row well point dewatering system are a reliable, safe and cost effective approach. Related Articles | Metrics

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Vacuum Preloading without Sand Blanket Construction Technique and It Results MIAO Dong1,SHENG Dongsheng2,3,ZHANG Hong3,ZHANG Jinliang3,WU Yuelong2,3 2015, 29 (3):  38-43.  Abstract ( 1243 )   Save This paper presents a successful vacuum preloading on dredged soils without sand blanket project. After 90 days of vacuum preloading, both physical and mechanical properties of the soft soils demonstrated improvements. The soil strength also increased, as examined by both the static plate loading tests as well as the vane shear tests. The bearing resistance of the surface soil reached the design required value of 50 kPa. The bearing resistance determination combined different industrial standards and summarized the design criteria for the bearing resistance for dredged soils. For surface soil within 1.5 meters below the ground, the 50 kPa requirement can be estimated with moisture content of the soil. If the moisture content of the soil is smaller than 57.8%, the bearing resistance of the ground is greater than 50 kPa, whereas, the bearing resistance of the soil is greater than 40 kPa if the moisture content of the soil is less than 62.5%. Related Articles | Metrics

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Design Parameters for Dayaowan Northern Shore Container Terminal Soft Soil Improvement LIU Xiaopeng，LIU Lin 2015, 29 (3):  44-47.  Abstract ( 1358 )   Save This paper presents a case history of the soft soil improvement design for the Dayaowan Northern Shore container terminal. After a thorough review of the site condition information, both hand calculations and numerical analysis were performed on the proposed container yard. The bearing capacity of the surface soils, resilient modulus and the post construction settlement after the soil improvement are estimated. The design parameters for this project are recommended. Related Articles | Metrics

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Support Design of Deep Excavation in the Metro Protective Zone LIU Dong1, 2 2015, 29 (3):  48-52.  Abstract ( 1236 )   Save The deep excavation activities in the metro protective zone demand a safe excavation support design and construction in order to maintain the safe operation of the metro system. This paper presents a case history of the deep excavation in the metro protective zone in Shenzhen. The potential main and difficult aspects of the construction of supporting system and their mitigation measures are evaluated in the paper. The proposed supporting system is recommended and the selection process are also discussed. Numerical analyses on the construction progress using the selected supporting system are performed. The results indicate that the deformation at both the entrance and exit of the tunnel are met the requirements. Related Articles | Metrics

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Sealing Practice of Deep Excavations in Fine Sand Soil Strata above Karstic Rocks LIN Huaguo1,YUAN Zuochun2,FENG Longfei1,ZHANG Yongsheng1 2015, 29 (3):  53-57.  Abstract ( 1469 )   Save This paper presents a case study for selecting type of braced excavation and water cutoff technique in high permeable soil in karst area. This specific project suggests that the quality and effectiveness of a seepage cutoff wall and the safety of the excavation can be improved at the design phase by improving cutoff wall design and increasing stability at bottom of the excavation.    Related Articles | Metrics

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Dewatering Impact on the Stability of the Deep Excavations LI Changshan 2015, 29 (3):  58-61.  Abstract ( 1533 )   Save The deep excavation for Qiutao Road Station of Hangzhou Metro dewatering case history is presented in this paper. The dewatering induced stability at the bottom of the excavated area, the ground subsidence in the adjacent ground as well as the construction impact on the adjacent environment are discussed. Relationship between the seepage cutoff effect and the ground settlement is obtained through the groundwater monitoring on both sides of the excavation. The seepage water leakage induced additional ground subsidence is also discussed. Related Articles | Metrics

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Common Highway Embankment Hazards and Construction Techniques of Transition Zone between Existing and New Embankments CHEN Liang1,TANG Chengyao2，LIU Junyong2 2015, 29 (3):  62-65.  Abstract ( 1107 )   Save The differential settlement between the existing and new embankment is the critical topic in highway widening projects. Excessive differential settlement will lead to the failure of the highway subgrade, settlements and cracks in the pavements. These defects can severely affect the performance of the pavement and reduce the service life of the pavements. This paper discusses five (5) common hazards in the highway embankment widening projects and their causes. Related Articles | Metrics

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Effects of the Groundwater Corrosion on the Concrete from the Different Sampling Time ZHAO Chong,TIAN Dichong 2015, 29 (3):  66-68.  Abstract ( 1271 )   Save This paper presents the groundwater corrosion to the foundation element test results. The water samples are collected from three toll collection locations in TangLang Expressway: BL, YL and FJ. The groundwater at various sampling time were tested for its corrosion to the concrete and steel reinforcement bars. The sampling collection time effect on the water corrosion is also studied. The results indicate that, within the same site, the impact of sulfate contents, magnesium contents and total salinity on the concrete and steel corrosion do not change with time. The same conclusion can be extended to the chloride content on the corrosion of the concrete and the steel. It is also recommended and the drilling only with clean water should be used in order to have an accurate groundwater sampling.       Related Articles | Metrics

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Application of the Advance Injecting Reinforcement Technology in the Subsea Tunnel of the Xiamen Eastern Passageway SU Wende 2015, 29 (3):  69-72.  Abstract ( 1451 )   Save The eastern passageway project in Xiamen is the first subsea tunnel in mainland China that was ever designed and constructed by Chinese professionals. The tunnel is design to be under the shallow buried depth in completed weathered on land segment and to pass the weathered trench under the sea. The potential construction difficulties include the penetration of the saturated sand strata and the vertical shaft construction in Xiangan. In summary, the complexities of the geological conditions is more than any of the subsea tunnels ever been constructed in the world. This paper discusses the characteristic and difficult aspects of the subsea tunnel crosses the waterenriched sandy strata and the weathered trench as well as the application of the advance grouting and reinforcement technique. The results show that: (1) in different construction stages of the weathered trench, the different advance grouting should consider both the surrounding rock degrees of weathering and water contents; (2) the TSS small diameter pilot pipe the cement silicate grout can effectively reinforce the waterenriched sandy strata. Related Articles | Metrics

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Groundwater Gushing in the Deep Excavation in Costal Soft Soil Areas XIONG Haoxiang1,LI Zhihong1，CHENG Zhan2 2015, 29 (3):  73-76.  Abstract ( 1340 )   Save It is a common and challenge hazard of the groundwater gushing from the water enriched weak soil strata during the deep excavation. This paper presents an engineering case study of the treatment of groundwater gushing during a vertical shaft excavation in the coastal soft soil areas. The aspects that might potentially affect the groundwater gushing, such as, specific site conditions, special construction methods and sequences are also discussed in the paper. Summaries in the deep excavation are provided with the aim of providing references for the future constructions in the similar areas. Related Articles | Metrics

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Application of Shallow Vacuum Preloading to Taihu Dredged Sludge TANG Zhonglin1，WU Hongming2，ZHANG Hongwei3，CHEN Hongbing4，WU Yuelong3 2015, 29 (3):  77-80.  Abstract ( 1370 )   Save Solidification of the lake dredged sludge and preventing it from secondary pollution is one of the important aspects of the ecological management of lake at present. The shallow vacuum preloading method used in the reclamation engineering is introduced to solidify the Taihu dredged sludge for the first time. During the solidification process, the surface settlement, vacuum pressure, pore pressure, vane shear strength were monitored and the static load test data were analyzed. The results show that this method is able to consolidate the Taihu dredged sludge quickly and cost effectively. Related Articles | Metrics

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Risks and Response Analyses in the Construction of a Shallow Buried Subway Tunnel DING Zhaohui 2015, 29 (3):  81-83.  Abstract ( 1417 )   Save This paper presents a case history of the Nanluogu Subway Tunnel construction in Beijing Metro No. 6 project. An old residential buildings are located right above the proposed the tunnel. The potential risks during the tunnel excavation are identified and the measures that mitigating those hazards are presented. The combination of the large diameter steel pipe shielding and the deep hole grouting methods are proved to be successful. The use of the shield support is critical to the safe excavation of the tunnel when is close to the residential buildings. It is also an effective protective measure for the deformation control of the buildings on the ground. Related Articles | Metrics

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Properties of Columnar Jointed Rock Mass in Rock Structure and Unloading Loose and its Engineering Prevention WANG Hongbin1,HAO Xianjie2，LI Shaojun2,JIANG Quan2 2015, 29 (3):  84-87.  Abstract ( 1130 )   Save The unloading collapse and the falling of the columnar jointed rock mass have challenged the excavation and supporting design of underground tunnel in Baihetan Hydropower Station project. This paper presents the results of the characteristics and the mechanism of the columnar structural surface and the irregular shaped rock joints based on the detailed field rock mass investigation results. The insitu rock features were revealed by the borehole camera and ultrasonic testing in order to develop the jointed rock supporting and excavation methods. These studies indicate that, after the excavation (unlading), the structural planes are opened and the results provide experience in the supporting and excavation of the similar rock mass. Related Articles | Metrics

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Study of the Effectiveness of Utilizing Vertical Piles to Stabilize Slope Failure Using FLAC3D XU Xiang， XU Jun 2015, 29 (3):  88-91.  Abstract ( 1770 )   Save  A numerical model was set up to simulate vertical piles for slope stability using FLAC3D. The effectiveness of the vertical piles to stabilize slope failure was assessed by deformation, stress, and plastic zone distribution. The simulation indicates that compressive stress is generally developed in the slope with principal stress generally parallel to the slope which results in driving force. The inclusion of vertical piles in the slope alters the stress condition and improves slope stability. Generally connected plastic zones are mainly the result of shear failure right above the soilrock interface. Vertical piles socketed in rock improve the slope stability by interrupting the connectivity of the plastic zones. Related Articles | Metrics

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Analysis and Discussion on Blasting Loading and Its Effect on Road-Rail Tunnel HE Yingdao 2015, 29 (3):  92-95.  Abstract ( 1174 )   Save The blast resisting capacity of large rivercrossing tunnel is the key aspects of tunnel disaster prevention and emergency response design. The impact of blast from the road level and rail level of the Sanyang Road River Crossing Tunnel were simulated with equivalent static loading. The results suggest that tunnel lining has redundant structural capacity under blast loading, while the internal structure needs additional reinforcement at certain areas.   Related Articles | Metrics

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Construction of a Three-Story Subway Transfer Center by Using Deep Excavation Supporting Method for the Two-Story Subway Station XIONG Zhu 2015, 29 (3):  96-99.  Abstract ( 1052 )   Save A threestory subway transfer junction is constructed underneath the main intersection of the city's main streets in the high groundwater area. The supporting structure is the same structure for the two story station deep excavation. The segmental strip excavation was used during the construction without increase the depth of the existing supporting structure. This paper presents the design and construction considerations.   Related Articles | Metrics

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Optimization of Tunnel Supporting Time Considering Rheological Properties of Metamorphic Schist LI Xiyong1,FENG Ling1，HAN Zhiqiang2,3 2015, 29 (3):  100-104.  Abstract ( 1306 )   Save For soft rock that having rheological properties, like the carbonaceous schist, the modified Burgers model, which is the combination of Burgers model and Mohr-Coulomb model, can characterize its visco-elastic-plastic deformation behavior. In a tunnel excavation project, the squeezed deformation zone with soft rock mass was numerical analyzed and the rheological model parameters are calibrated throughout the back analysis. The paper discusses the interactions between the carbonaceous schist rock mass and the supporting structures. The optimization of the time for the tunnel excavation supporting is made possible by using the numerical analysis results, regression analysis results and the construction monitoring data. Related Articles | Metrics

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Limiting State Design of the Soil Improvement Method by Horizontal Drainage HUANG Fuhai 2015, 29 (3):  105-109.  Abstract ( 914 )   Save The limiting state equations are established based on the consolidation design parameters that are calibrated with the monitoring data from the case histories. The equivalent reliability indices of the variables in the current design code are identified. The structure importance factor and the resistance factor for the embankment stability are adjusted based on the reliability theory on the soil improvement projects. The limiting state design approach of the horizontal drainage method is established. In the paper, the soil improvement design for the case histories of XinChang and GuangZhu railway projects are compared with both conventional and limiting state approaches. The results indicate that both methods yield similar results. Related Articles | Metrics

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Selection and Improvement of Augers in the Foundation Drilling GENG Xiewei 2015, 29 (3):  110-113.  Abstract ( 1083 )   Save  Foundation drilling in various soil and rock strata is achieved by using different drill bit and augers. This paper presents a case history of auger and drill bit selection so that different soil layers cab be effectively drilled. The paper also discusses the improvement of the existing drill bit so that the construction efficiency can be improved and the service life of the drill bit can be increased.   Related Articles | Metrics

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Research on uniaxial creep model of undisturbed reticulate red clay YANG Yuanli，LI Jianzhong 2015, 29 (3):  114-117.  Abstract ( 1134 )   Save Studies show that the reticulate red clays have the creep characteristics. The SinghMitchell Model has the advantage of the triaxial creep behavior of this type of soil due to its suitability in a wide variety of soil properties with the minimum soil parameters. However, the description of the uniaxial creep behavior using this model has not been reported. The paper presents the one stage as well as multistage uniaxial creep test results on undisturbed soil samples from Yuelu Mountain, Changsha City. The Singh-Mitchell Model was used to simulate the test results and it suggested that this model has a better fit that other models. Related Articles | Metrics

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Numerical Simulation of the Excavation Process of a Hydropower's Underground Powerhouse LI Chao1,PENG Xuan2,WANG Yuan3,LUO Bangpei4,WU Lang4，YANG Zhenrong4 2015, 29 (3):  118-121.  Abstract ( 1295 )   Save The stability of the large cross sectional underground space during the construction is one of the important topics in underground engineering. The excavation method as well as the sequence of the main plant of an underground power house is numerically simulated twodimensionally by using ADINA software.  In the numerical simulation, the effect of the rock anchored was simulated by an equivalent shotcrete modulus. The stress, displacement and the yield zone are evaluated based on the specific site conditions. The analytical results are found to be consistent with the actual construction monitoring data. Related Articles | Metrics

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The Model That Can Describe the Static Loading Curves of Helical Piles WANG Chengwu,GONG Chengzhong，LI Xiuhua 2015, 29 (3):  122-124.  Abstract ( 1092 )   Save The static loading test curves of helical piles are fitted by the Richards model and the axial bearing capacity of the test piles are estimated. The results indicate that the Richards model is better than the power index and hyperbolic models in the curve fitting. Both the curve fitting and the accuracy of the prediction can meet the requirement of the projects. The results also verified that the feasibility of applying Richards model in the static testing of helical piles.   Related Articles | Metrics

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Stability of Highway Tunnels in the Shallow Buried Coal Bearing Strata WANG Nan,LI Chao,YE Mingliang 2015, 29 (3):  125-128.  Abstract ( 1159 )   Save Tunnels are more and more popular in the construction of the higher grades of highway in the mountain areas. The tunnel construction in the mountainous area is a challenge in the Southwestern China due to the complexities of the geologic conditions, especially, when the tunnel are penetrating through the coal bearing strata. The control monitoring is a key measure for the safe construction of the shallow buried tunnels. This paper presents a case history of the construction monitoring of the settlement at the tunnel crest and the deformation at the surrounding area. The deformation characteristics in the tunnel through coal bearing strata are summarized. Related Articles | Metrics

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FEM Settlement Analysis of Oil Tank over Natural Soils LIN Chuan1,MA Yongfeng2,GUO Bingxin3,ZHOU Kai4，ZHOU Xunjun2 2015, 29 (3):  129-133.  Abstract ( 1119 )   Save The two dimensional finite element analysis model for the settlement of oil tanks over natural soils are established based on the Guangxi Petroleum annual 10 million metric tons refinery project. The soil parameters are back analyzed from the settlement observation results. The results indicate that the computed settlements are slightly greater than the monitored data and therefore the safe tank operation can be warranted. The post construction monitoring is needed since the settlement beneath the oils tanks might be long term.   Related Articles | Metrics

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Application of Discrete Element Method in the Stability Evaluation of the Jointed Rock Slopes ZHOU Xiangguo1，LI Senlin2 2015, 29 (3):  134-136.  Abstract ( 1085 )   Save This paper presents the jointed rock slope stability analysis results by using the discrete element method. The factor of safety values are obtained from the jointed slope with fixed sliding planes and sliding plane with automatic searching techniques. These results are also compared with the limit equilibrium method and it is concluded that al results are similar. Related Articles | Metrics

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Numerical Analysis of Reinforced Soil Slope Using FLAC3D WEN Xu,LI Fengxian，LI Lianying 2015, 29 (3):  137-140.  Abstract ( 1651 )   Save Staged construction of a reinforced soil slope (RSS) was modelled with  FLAC3D， a finite difference software. The results were used to obtain the relationship between factor of safety of the RSS against sliding and reinforcement length/spacing, along with the discussion on lateral displacement of RSS and distribution of tensile stress along the reinforcement. Related Articles | Metrics

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Numerical Analysis of Effects of Deep Excavation on Existing Metro Structure SONG Leipeng 2015, 29 (3):  141-144.  Abstract ( 1413 )   Save  MIDAST/GTS was used to develop a three dimensional model to study the effects of deep excavation on an existing metro structure. The results suggest that the proposed deep excavation design is capable of controlling the maximum displacements of existing metro structure in both horizontal and vertical directions within tolerable limit, i.e., the excavation has minimal impact to the metro structure. The numerical model was also used to propose the approaches to reduce the possible risks in the process of deep excavation.   Related Articles | Metrics

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The Application of Fox's One-dimensional Large Strain Consolidation Model in Settlement Estimation for Embankment ConstrUction on Soft Soils LI Chunling,QIAN Liying，ZHOU Xiantao 2015, 29 (3):  145-148.  Abstract ( 1417 )   Save With the rapid development of highway construction, soft soils are frequently encountered especially in coastal areas of Jiangsu and Zhejiang. Therefore, it is of great academic value and social benefit to improve the existing settlement calculation and forecast method, so that the estimated settlement is close to the actual measurement. Fox's onedimensional large strain consolidation model (CS2) was utilized to estimate the embankment settlement of the south bank connecting line of the bridge form Jiaxing to Shaoxing. The improved CS2 model accounts for the nonlinear change of parameters during the process of consolidation. The simulated roadbed consolidation settlement was validated by monitored settlement. Related Articles | Metrics

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Study on Physical and Mechanical Properties of Sediment from Centralwestern Pacific Basin ZHU Kunjie1,2,WANG Jinlian1,2,DENG Xiguang1,2 2015, 29 (3):  149-152.  Abstract ( 1295 )   Save  A series of tests, such as water content, density, miniature vane shear, and micro penetration, were performed at the scene on the samples collected by piston gravity coring in COMRA Cruise 32 Voyage in Pigafetta Basin and the Central Pacific Basin. The physical and mechanical properties of the surface sediments of deepsea basin indicate high water content，low density，low shear strength and low penetration resistance. There are good correlations among the different geotechnical parameters. The variation of the parameters can also be generally correlated with the depth. Related Articles | Metrics

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Landslide Stability Analysis Using Meshfree Method CAO Xiujuan，YANG Hongpo 2015, 29 (3):  153-155.  Abstract ( 1236 )   Save In comparison to finite element method, meshfree method is independent of the mesh quality. Reproducing Kernel Particle Method was used to study the cause a typical landslide. The safety factor was obtained by the strength reduction method, and compared with the limit equilibrium method. The results of meshfree method yield more straight forward slope deformation at failure that is close to the actual field monitoring. Related Articles | Metrics

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Numerical analysis of Deep Excavation Dewatering Induced Ground Subsidence FANG Runlin 2015, 29 (3):  156-158.  Abstract ( 1477 )   Save The mechanism of ground settlement due to foundation pit dewatering was analyzed. The mechanism of differential settlement as a result of change in effective stress and pore water pressure was discussed. The water and soil coupled model in ABAQUES was utilized in the simulation. The results of the analysis compared well with field observation. Additional parametric study indicates that ground settlement increases with increasing in foundation pit dewatering depth.   Related Articles | Metrics

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Influence of Moisture Changes on the Shear Strength of Undisturbed Soils HU Zhongquan，YU Xiaoli 2015, 29 (3):  159-160.  Abstract ( 993 )   Save Shear failure is a very common failure mode in the engineering practices in highway slopes, embankments, earth and rock filled dams as well as building foundations. The moisture content is an important physical index of soil mas and different shear strength of soils are correspondent to different moisture contents. This paper presents a series of direct shear test results on undisturbed soils with various moisture contents. The impact of moisture contents on the shear strength are studied.   Related Articles | Metrics

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Test study on Dynamic Strength and Strain Behavior of representative Marine Soil CHENG Yuhui1,HOU Hongwei2 2015, 29 (3):  161-165.  Abstract ( 1107 )   Save This paper presents test results of stressstrain properties of the undisturbed Zhoushan marine soft cohesive soils under cyclic dynamic loadings. Laboratory tests were focused on the dynamic stresses, strains and pore pressures in relation with the loading cycles. The results indicate that, the dynamic strength decrease with the increase of load cycles and the strength indices are correlated with the magnitude and cycles of dynamic loadings. The stressstrain relationship can be characterized with an incomplete closed hysteresis loop. Under cyclic loading conditions, the magnitude of both tensile and compressive strains are affected by the intensity of the dynamic stress. The failure mode of samples under the dynamic loading is compressive failure. The magnitude of tensile and compressive strains tend to similar with the increase of loading cycles and the development of plastic strains. The development of the dynamic strain can be characterized by the modified Monismith model.   Related Articles | Metrics

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Field Trial Study of Using Soft Rock as a Dam Construction Material CHEN Chaohong 2015, 29 (3):  166-169.  Abstract ( 1168 )   Save The use of soft rock as a dam construction material receives a wide application with the development of the dam construction technology. This paper presents a case study of the field trial study of P1 soft rock quarry for the Rockfill dam of a reservoir. The test results are used for providing the appropriate design parameters in order to save the construction cost.   Related Articles | Metrics

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Preliminary Study on the Soil Property Identification in the Geotechnical Investigations for Halfaya Oilfield, Iraq SUN Yue1，ZHOU Jianguo2,LI Long1 2015, 29 (3):  170-172.  Abstract ( 2196 )   Save Halfaya oilfield is located in the plain of Mesopotamian, south Iraq. The subsurface soils mainly consist of silt, clay and sand. Soil property identification is an important aspect of the geotechnical engineering. It is required that the geotechnical investigation work be performed in accordance with the western codes and there are fairly great difference between the state of the practice in China and western countries. These differences exist in the definitions of silt and elastic silt, empirical relationship between soil properties and blow counts of Standard Penetration Test as well as the criteria for the relative density of the sandy soils. This paper compares the differences of the above aspects and provides recommendations of the geotechnical investigation work if the western code is being used. Related Articles | Metrics

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Construction Monitoring and Application in Jianchanggou Tunnel Excavation LI Jinglong， SUI Bin 2015, 29 (3):  173-175.  Abstract ( 2091 )   Save This paper presents a case history of the application of the construction monitoring of the New Austria Tunneling Method (NATM) support in the Jianchanggou Expressway Tunnel excavation. The monitoring methods applied in monitoring the stability of the rock mass are introduced. A typical section monitoring data are presented in details. The monitoring ensured the stability of the rock mass and the helped in determining the time for the secondary lining support. Related Articles | Metrics

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Optimization Design of a Three Dimensional Monitoring System for the Stability of a High Slope XU Yiming1,PAN Yi2,YANG Xu2,ZHOU Cuiying2,LIU Zhen3,LEI Ming1，XIA Jian1 2015, 29 (3):  176-180.  Abstract ( 1233 )   Save The appropriately distributed of transducers in the three dimensional monitoring system for the stability of a high slope can improve the monitoring reliability, reduce the monitoring cost as well as ensure the safety of the cut slope. This paper presents an optimization design of the monitoring system of combining the prestressed ground anchor monitoring probes and the slope inclinometers. The optimization design is based on the application of the optimality principles as well as the three dimensional numerical analysis. This optimized system was applied in the stability monitoring of an expressway high cut slope. The results indicate that this optimized method can effectively reduce the use of construction materials and cost. The coverage of the monitoring system can be maximized and the monitoring errors, such as, data loss, repeated data, can be minimized.   Related Articles | Metrics

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Static Uplift Load Tests for the Percussively Formed Cast-in-Place Concrete Piles HU Rujun，LI Qiang,XIAO Ganping 2015, 29 (3):  181-183.  Abstract ( 1582 )   Save The static uplift load tests on two percussively formed castinplace concrete piles indicated that the uplift resistance did not meet the design requirements. The uplift resistance estimation should consider the influence of the slurry in the pile installation, and the limit uplift resistance should be determined by the static load testing since the large variations of different estimation methods. The piles were post grouted and the uplift resistances are significantly improved.    Related Articles | Metrics

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Feasibility Study of Using Plastic Tubes in the Integrity Testing of Cast-in-Place Concrete Piles LI Linyong 2015, 29 (3):  184-187.  Abstract ( 1390 )   Save The steel producing is a high pollution and high energy consumption industry and it is the social development trend of reducing the use of steel productions. The steel pipes in the state of the practice of the crosshole sonic logging in the integrity testing of the castinplace concrete piles predominant and the utilization of the PVC plastic pipes in the integrity testing is relatively rare. This paper presents a feasibility study of the use of plastic pipes in the sonic logging test. The design, application and installation aspects of the plastic pipes are discussed in the paper.   Related Articles | Metrics

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Probe Borings and Optimization for Large Diameter Piles in a Residential Community in Karst CHEN Xuejun,CHEN Wenwen 2015, 29 (3):  188-190.  Abstract ( 1092 )   Save Guilin is located in a typical Karst terrain. The probe boring practice in the area is one hole for each castinpace pile. Potential safety hazard might exist for this general practice since the accurate geological information below the large diameter pile tip is still difficult to obtain. In the foundation construction project of a residential community, which large diameter castinplace piles are utilized, the number of probe holes at each pile location are optimized. The spacing of the probe holes is determined by the diameter of the proposed pile and the tip elevation is determined based on the most unfavorable conditions revealed by the probe holes. The construction records and pile coring results verified that the investigation was very close to the actual construction conditions. The coring results also indicate that there are no rock cavities and broken rock mass underlying the pile. Related Articles | Metrics