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20 February 2016, Volume 30 Issue 1 Previous Issue    Next Issue

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Site Selection Considerations for the Longjiang Extra Long Bridge in Baoteng Highway YAN Fei1,2, YIN Xiaotao3 2016, 30 (1):  1-4.  Abstract ( 1655 )   Save The site location selection of bridge depends on the stabilities of the abutment slopes and bridge structures, which are not clearly defined in current industrial standards or codes. This paper studied the stability of the abutment slopes for Longjiang bridge on highway from Baoshan to Tengchong by performing a comprehensive slope stability evaluation considering various terrain condition changes and slope failure modes. The proposed scheme of moving back bridge abutment 40 meters provides long term stability without requiring slope stabilization measures. The methodology used in this project will provide some guidance similar projects. Related Articles | Metrics

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Application of the Cast-in-Place Concrete Secant Pile and Ground Anchors in a Deep Excavation CHU Wei1， LEI Meiqing2 2016, 30 (1):  5-8.  Abstract ( 1837 )   Save The paper presents a successful project utilizing jet grouting secant piles with ground anchors and dewatering well for deep excavation in Jianghan Plain alluvial soil. The project is located in the District of Fancheng, Xiangyang City and it involves constructing 3floor underground basement of 4260 square meters with an excavation depth of 15 meters. The subsurface consists of mainly Jianghan Plain alluvial overburden with exposed gravel layer within the limits of excavation. The project location is only 300 meter away from Hanjiang River and the ground water table is about 3.0 meter below the existing ground. The support of excavation requires to consider retaining soils, seepage control, bottom heave or boiling, and etc. Related Articles | Metrics

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Stability Analysis and Mitigation Design of a Landslide at Longtanqiao Railway Section in Zhangjaijie ZUO Wengui， QU Xuguang 2016, 30 (1):  9-12.  Abstract ( 1727 )   Save This paper analyzed the mechanism of the landslide at Longtanqiao railway section in Zhangjaijie considering topographic condition, geological formation, the influence of groundwater, and human engineering activities. This paper presents the slope stability analyses using transfer coefficient method and the mitigation measures developed based on the slope stability analyses. This projectcan be used as references for similar projects in the future.   Related Articles | Metrics

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Engineering Application of Composite Ground with Rigid Columns WANG Liang, HONG Disi 2016, 30 (1):  13-15.  Abstract ( 1643 )   Save It is a challenge to select the proper ground improvement techniques for the construction that involves thick fill materials. This paper presents a project located in Huaian, Jiangsu Province which successfully utilized composite ground with rigid column (RC) foundation to improve the ground conditions for three structures. The composite ground with rigid column (RC) foundation was proven to be technically sound and economically effective. Related Articles | Metrics

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Large Oil Storage Tank Foundation Treatments and Testing LI Rongxian, LI Chenggang, FENG Zhanhai 2016, 30 (1):  16-19.  Abstract ( 1489 )   Save The paper presents a series of ground improvement techniques used to minimize the potential large differential settlement for a crude oil tank farm station with complex subsurface conditions. Considering the fill materials at upper layer and weak soils at lower layer, the ground improvement involved the combination of low energy dynamic compaction and Cement Flyash Gravel (CFG) columns with various lengths through different soft soil. This paper presents the subsurface conditions encountered, construction controls, and testing performed to verify the effectiveness of the ground improvement.    Related Articles | Metrics

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Mountain Tension Fissure Investigations and Mitigations for Station K313+950 and K314+300, Baocheng Railway LIU Linji1, HOU Xiaofeng2 2016, 30 (1):  20-23.  Abstract ( 1514 )   Save Baocheng railway K313+950-K314+300 downlink line on the north side of the mountain consists of complex geological conditions and the safe operation of the Baoji Chengdu Railway Vehicle is threaten due to large scale cracks. Based on the investigation of the crack，the stability evaluations were performed for the entire mountain and different sections of the mountain. A comprehensive mitigation plan was developed including piles, ground anchors, protection nets, and crack filling. This paper provides a reference for future similar engineering geological disaster treatment. Related Articles | Metrics

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A Case History of Cut Slope Stability and Remediation for a Residential Community WANG Kui 2016, 30 (1):  24-27.  Abstract ( 1537 )   Save The slope stability and remediation techniques are key elements in the design and construction of residential community. This paper presents a project located in Jingdezhen which demonstrated that the key factors affecting the slope stability are slope angle, hydrogeological conditions，geological conditions，physical and mechanical properties of rock, and etc. Related Articles | Metrics

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River Crossing Shielded Tunnel Remediation Techniques for Wuhan Metro No. 4 Line XU Yanzhao 2016, 30 (1):  28-31.  Abstract ( 1485 )   Save In the crossriver project along Wuhan Metro Line 4, when the shield got through the portal, water burst and sand boil took place, damaging greatly lining segments. And they must be repaired ahead of usage. This paper will introduce relevant repairing methods to remediate the damaging situation. The paper can also provide some experience and reference for similar segment repair.    Related Articles | Metrics

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Application of  TSP Technique in the Tunneling in Phyllite Rock Mass CAO Haiyang， JIA Jinxiao， LIU Yangfei 2016, 30 (1):  32-35.  Abstract ( 1184 )   Save In the phyllite rock tunnel construction，the soft, broken surrounding rock is easy to causing instability of the geological disasters such as collapse accident in the process of excavation disturbance. Tunnel geological disasters serious threat to life，property and engineering quality, Accurate prediction of tunnel geological conditions and make a good plan in prevention and control geological disasters is the premise to Control and reduce accident loss . This paper compared TSP geological forecast results with the actual excavation results for K181+273～K181+376 in Zhegushan tunnel Wenma highway. This paper also discusses the Tunnel Seismic Prediction (TSP) geological prediction technology application in phyllite section tunnel of the metamorphic rock area.    Related Articles | Metrics

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A Case History for the Evaluation and Remediation of Lijia Landslide of Nanyuan ZHANG Shoulong 2016, 30 (1):  36-40.  Abstract ( 1467 )   Save Landslides are a global disaster, which cause significant threat to the construction and  life and property. The landslide is widely distributed in various provinces and regions in China .As a kind of destructive geological disaster, landslide often poses a serious threat to human life, property, and environment, which restricts the sustainable development of human beings. In order to prevent and reduce this disaster, the subject of landslide treatment has increasingly becomes a researching hotspot in the academia and engineering field both at home and abroad. This paper studied the landslide in Nanyuan Village of Yujiang County and presents the remediation treatments for this landslide.   Related Articles | Metrics

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A Unstable Slope Disease Evaluation and Management LUO Yao1， WANG Haihua2 2016, 30 (1):  41-43.  Abstract ( 1561 )   Save Geological hazard on the roadside slopes affects the safe operation of the highway in the mountain area. This paper presents a case history of highway slope geological hazards evaluation on the AB Slope in Zone I at Ciping of Jinggangshan. The regional engineering geological environment was investigated throughout the geological, topographical, meteorological and hydrological aspects. The potential geological hazards, including the slope stability, on the highway slopes are evaluated. The remediation measures are also provided.   Related Articles | Metrics

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A Case History of an Abandoned Mine Mitigated by the Dynamic Compaction YU Lianshun1, WANG Zong2, CHANG Hongshuai2, LIU Li3 2016, 30 (1):  44-46.  Abstract ( 1588 )   Save This paper presents a case history of an abandoned mine mitigated by the dynamic compaction. The mitigation system consists of providing drainage path, filling voids, dynamic compaction and replacement procedures. The construction parameters of the dynamic compaction selection criteria are also discussed in the paper. The quality assurance testing results indicate that the mitigation is successful.    Related Articles | Metrics

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Application of Double-Row Piles in the Deep Excavation for a Metro Parking Facility WANG Huang 2016, 30 (1):  47-49.  Abstract ( 1525 )   Save In addition to the general requirement for the strength and stability, the DoubleRow pile deep excavation supporting system has the advantage of less impedance to the construction of the excavated zone, smaller disturbance to the adjacent environments and the ease of soldier pile construction. This paper presents a case history of the application of DoubleRow pile supporting system in the deep excavation of an underground parking facility for the Wuhan Metro.     Related Articles | Metrics

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The Application and Comprehensive Evaluation of Random-Fuzzy -Probability Statistics Method in Slope of Rumei Hydropower Station LUO Binhong， SUN Hualing 2016, 30 (1):  50-54.  Abstract ( 1391 )   Save The biggest bottleneck in Slope Stability Evaluation System is the actual occurrence state of evaluation factor is discrete, and the interlayer is clear. For this, we took samples of results of rock mechanics laboratory test from about 100 groups as the total sample, and introduced statistical theory to put the membership probabilities of factor under different stable levels as the membership value in the level, which avoiding excessive subjective sense when measured value is selected to participate in the evaluation. There are many methods of determining the weights, but some problems are existing in those . On the basis of the theory of probability and statistics, and using the brainstorming method to summarize the opinions of different experts in mathematical statistics, the representative weight values are obtained, which can take emphasis of different experts into comprehensive consideration and achieve better results. The findings are applied in the fuzzy evaluation system to evaluate strength of the rock slope in the left bank of Rumei power station, and results are better able to reflect the slope stability. Related Articles | Metrics

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Several Considerations on the Common Factors in the Geotechnical Engineering NIU Genbo1, LIU Kehua2, LIU Fuchen3 2016, 30 (1):  55-58.  Abstract ( 1480 )   Save This paper presents the author’s considerations on several parameters and concepts that are commonly misused by the practitioners. These parameters/concepts are: index properties for design can be selected from the local practice; difference between the net additional effective stress and the footing pressure; design parameters for layered soil can be taken from the layer thickness weighted average; the mechanism of the quick sand is essential the same as the liquefaction; the relief platform should be close the bottom of the retaining wall. The paper presents the correct parameters and concepts.   Related Articles | Metrics

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Retrogressive and Bedding Landslide Evolution Process and Progressive Failure Mechanism Numerical Method Research of Guiyang ZHENG Kerui1, YU Bo2, YANG Chaofa3， CHEN Yun1 2016, 30 (1):  59-63.  Abstract ( 1286 )   Save This paper presents a daylighting rock slope failure simulation results. The progressive slope failure through excessive deformation and its evolution factors are evaluated through the geological investigation and deformation analysis by software FLAC3D. The layered rock joint was incorporated in the deformation analysis of the numerical model. The stability evaluation was performed under the most unfavorable conditions. The numerical analysis results is similar to the limit equilibrium analysis by using segment line method. The process of the shear movement at the failure plane is also dynamically simulated.  Related Articles | Metrics

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Numerical Analysis of the Lateral Rigidity of the Waler in a Soldier Pile and Anchor Supported Deep Excavation HAO Yu，PENG Wenxiang, SHEN Haiping 2016, 30 (1):  64-67.  Abstract ( 1168 )   Save The spatial effect of the reinforced concrete waler system at the top of the soldier pile has different impacts on the lateral deflection as well as the internal force in the soldier pile and ground anchor supporting system in the deep excavation. The lateral deflection and the stress in the reinforced concrete waler of a soldier pileanchor supported deep excavation in Changsha are monitored and predicted through commercial software FLAC3D. The role of the rigidity of waler system in the soldier pileanchor supported system is investigated and the simplified rigidity analysis method is proposed for the engineering practitioners.   Related Articles | Metrics

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Sliding Factor of Safety Calculations under Various Special Conditions WANG Linyong1, LIU Fuchen2, LIU Minnan3 2016, 30 (1):  69-72.  Abstract ( 5376 )   Save The different sliding factory of safety in the retaining wall design under various loading conditions are presented in this paper. These conditions are: reverse slope at the bottom of a retaining wall; segmental lined slope failure mode; and circular failure mode. The factor of safety calculation formulas are proposed. The case history calculation these methods are reasonable. Related Articles | Metrics

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Corner Effect in a Deep Excavation Supported by Soldier Pile and Ground Anchor System SHEN Haiping, PENG Wenxiang, HAO Yu， WU Yiduo 2016, 30 (1):  73-76.  Abstract ( 1168 )   Save The corner effect of a deep excavation supported by the soldier pile and ground anchor system as well as factors that impact the this effect are evaluated by the commercial finite difference analysis software FLAC3D. The spatial distribution of the deformation due to the excavation is evaluated and the influence of the corner effect can be quantified. The corner effect coefficient is therefore obtained and the deformation prediction method that considering the corner effect is proposed and verified by the excavation monitoring data. Related Articles | Metrics

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Deformation Prediction Method of Composite Gravity Retaining Wall in Two Steps LIU Zunjing1,3，CHEN Kunxiao2，LU Jindi2，YANG Min1，YAO Han2 2016, 30 (1):  77-82.  Abstract ( 1738 )   Save Composite gravity retaining wall is one type of excavation support structure that in between gravity retaining wall and piled supporting structure. Since the complicated relationship of this internal structure of the retaining wall, there has not been an appropriate deformation estimation method other than the finite element method. Based on the elastic Winkler model, this paper proposes a twostep iterative calculation method considering its spatial effects. The first step of the calculation is a conventional method in accordance with the Winkler model, the second step is to superpose an additional moment generated by friction of interpolated reinforcement structure to the grid point on the Winkler beam, using the deformation curve obtained by the first step. Through an engineering example, the method is validated.   Related Articles | Metrics

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Influence of the Sand Particle Size on the Compressive Strength in the Analog Model Study JIA Jinxiao1， LI Tianbin1， CAO Haiyang1， PEI Mingsong2 2016, 30 (1):  83-86.  Abstract ( 1365 )   Save The influence of the sand particle size on the compressive strength of the analog model study is always ignored in analog simulations. This omission leads to the difficulty of finding the matching ratio of the model. The impact of the particle size of the sand on the compressive strength in the analog model studies with other factors remain unchanged. The results indicate compressive strength of the model is reversely related to the particle size of the sand. The impact of the particle size on the strength is proportional to the cementation of the sand material. Related Articles | Metrics

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Discussion of DepthModification of Subgrade Bearing Capacity of Main and Attached Building Foundation LI Zhi， CHEN Song， CHEN Zhijun 2016, 30 (1):  87-90.  Abstract ( 1604 )   Save With the largescale development of construction, the width and depth of the foundation of highrise buildingsismore and more large,and the boundary conditions of the foundation become more and more complex. Besides,in order to satisfy the requirements of a variety of functional use, there increasingly emerged with manyconditions such as the podium designed as a whole with the main building, or the adjacent buildings approaching so close to the main building edges, when determining the characteristic values of the bearing capacity of the foundation, the specificationdoesn'tdefine how to reasonably consider the influence of the ground overload on the depth correction. For a variety of complex foundational boundary conditions, the adjacent overloading situations above the foundation vary differently, based on the theory of limit equilibrium of soil , this paper discussed how the depth correctionof subgrade bearing capacity is considered and how to judge the depth and range of the overload correctly and reasonably. Related Articles | Metrics

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Collapse Properties of Loess under Various Vertical Pressures ZHANG Changcheng, DING Bing, ZHANG Jing 2016, 30 (1):  91-94.  Abstract ( 1354 )   Save The coefficient of collapse of loess on samples were tested under various vertical pressures with both single line and double lines methods. The results indicate that, the coefficient of collapse increases with the vertical pressure. This paper also evaluates the properties of loess from the deposition and microstructures. Related Articles | Metrics

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Monitoring and Settlement Analysis of Soft Soils Surcharge with Prefabricated Vertical Drains XU Binfeng, XU Yinnian, ZHENG Bin, YANG Lanqiang 2016, 30 (1):  95-98.  Abstract ( 1597 )   Save It is important to accurately predict the settlement of soil improvement projects since it has a large impact on the soils after the construction. This paper first summarizes the settlement prediction methods that are used in the soft soils, and then the settlement prediction methods are used in a project to predict the settlement so that the methods that are most applicable to soft soils in Ningbo area can be selected. The results indicate that the modified threepoint parabolic curve method proposed by Chen has a better prediction the settlement of soils in Ningbo area. Related Articles | Metrics

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Application of Underwater High-Density Resistivity Method in Karst Terrain HUANG Huan, JIA Yuwu 2016, 30 (1):  99-101.  Abstract ( 1969 )   Save The geotechnical investigations in the karst terrains require not only to determine the variation the karstic rock surface, but also to real the development of the rock pinnacles, rock cavities in the rock mass as wells soil cavities at the soilbedrock interface. Due to the random occurrence of these adverse geological features, the drilling and rock coring cost will be excessively high, especially, if the drilling operation is under water. This paper presents the underwater highdensity resistivity method as a compensate method for the geotechnical investigations in the karst terrain.   Related Articles | Metrics

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Experiment Study of Secondary Consolidation Properties of Zhuhai Soft Soils WANG Bing1, LIU Jianmin2 2016, 30 (1):  102-105.  Abstract ( 1351 )   Save The one dimensional secondary consolidation properties of the soft soil underneath a bridge site in Zhuhai, Guangdong Province are laboratory investigated. The coefficient of the secondary consolidation were tested under various moisture contents and loading conditions. The results indicate that the secondary consolidation coefficient increases with the increase of the confining pressure. The secondary consolidation process is affected by the moisture content of the soft soils. The secondary consolidation decreases in the reloading process after the unloading.  Related Articles | Metrics

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Seepage Testing of Saline Soils in Western Qinghai LI Jiquan 2016, 30 (1):  106-109.  Abstract ( 1409 )   Save The paper presents the feasibility of conducting insite permeability testing to evaluate the seepage of the saline soils in western Qinghai. The concept of permeability coefficient is also introduced in the paper. The grain size characteristics of the saline soils in Mangya and the selection of the testing equipment for the insitu seepage testing are also introduced. The test points at various soil depths and soil properties are characterized. The permeability tests procedures and the seepage volume with time curves are provided. The seepage limits in the saline soils are evaluated by the high density resistivity method. Related Articles | Metrics

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Application Testing of Variable Energy Dynamic Penetrometer in the Rapid Detection of Channel Filling Quality WEN Shiyi1, REN Jiali2, CHENG Yonghui2， WANG Hanwu2 2016, 30 (1):  110-114.  Abstract ( 1443 )   Save Degree of compaction is an important index in quality control of channel filling, use cutting ring method to examine usually, but it have a long testing periodic time and destroy the embankment heavily. Based on the relationship, that tip resistance of variable energy dynamic penetrometer and degree of compaction, put forward a rapid testing method of degree of compaction detect. Which is use traditional cuttingring method to standardize the surveyed area, find a tip resistance correspond with the degree of compaction, and then use variable energy dynamic penetrometer to measure the embankment, according to the tip resistance evaluate the quality of the fill body. This method have a tiny damage to the fill body, and achieve the fast testing of the fill body which have many layers uninterrupted, satisfy the need of detection, have a broad application prospects. Related Articles | Metrics