Table of Content

20 December 2018, Volume 32 Issue 6 Previous Issue    Next Issue

For Selected:

Download Citations EndNote Reference Manager ProCite BibTeX RefWorks

Toggle Thumbnails

Select

Stability Analysis Considering Rheology on the High Cut Access Road Slope of a Coal Mine in Southern Hunan ZHENG Yichen1， ZHANG Keneng2 2018, 32 (6):  571-573.  Abstract ( 489 )   Save The limit equilibrium stability analysis is the major design methodology for the supporting system for the high cut slopes in Chenzhou area. This analytical approach ignores many observed coal mine soft rock instability phenomena, such as, progressive failure, nonhomogeneous & heterogeneous in rock properties, noncontinuous as well as time related rheology. Under the action of rheology, the cut slope might result in a local instable and then progressive revolute into a global failure without a prominent slip surface been developed. When the time related creep movement reaches a threshold value, the local slope failure and even global landslide might occur. For the stability analysis work of access road slope in the soft rock coal mines, in addition to the creep characteristics of overburden soil, the rheologic properties of the soft rock mass soil also be considered. Based on a literature review of the stability analysis considering the rheology, this paper presents the stability analysis results of highway section between K2+700 and K2+800. Both the limit equilibrium and the rheology approaches are used and the Burgers model that considering the longterm strength was used in the analysis. Related Articles | Metrics

Select

Application of Embedded Channels in the Cast-in-Place Shielded Tunnel Construction of the Urban Rail Transit System ZHOU Chenghua 2018, 32 (6):  574-577.  Abstract ( 1113 )   Save As an efficient, cost effective and excellent corrosion retardation method for the installation of utility and equipment channels during the shielded tunnel excavation and, the embedded channels in the castinplace concrete shielded tunnel excavation for the urban transit system have received wide applications. Compared with the conventional utility channel installation method, the efficiency of the embedded channels has demonstrated its advantage. The corrosion performance of the imbedded structures was laboratory tested and the corrosion prevention methods for the embedded channels applied in transit tunnel projects in China have been reviewed. The cost for embedded channel with different widths are compared with the conventional anchoring method. The results indicate that, the embedment of utility and equipment channel on the forms of the castinplace concrete has a better performance than the other methods. The theoretical service life of the embedded channels could be 100 years. However, the current corrosion prevention methods applied in the existing projects will usually result in a less than 100year of service life. Due to its higher service life, the cost of the embedded channel is higher than the chemically anchored channels. However, considering the maintenance cost, the cost effectiveness of the embedded channels can still be justified. Related Articles | Metrics

Select

Exploration of a Large Landslide of a Proposed Highway Alignment Near Minda Village in Tibet TANG Jun, HE Weishan，SONG Zhenghui 2018, 32 (6):  578-581.  Abstract ( 474 )   Save The selection of highway alignment in the mountain area should consider the geological conditions. Geohazards in the mountain areas, such as, landslides, has the characterization of large influence area, high mitigation and maintenance cost and it might affect the feasibility of the highway alignment. In the phase of final alignment determination, if the potential landslide within the potential alignment alternates can be identified and explored, the highway alignment can be determined with much less construction and maintenance cost. The large landslide near Minda Village was investigated and the sliding limits were mapped, the principal sliding direction was determined. The stability of the landslide body was evaluated by using test borings, geo-physical methods and other in-situ as well as laboratory geotechnical testing methods. The geotechnical parameters at the sliding body were back analyzed and these are used in the stability evaluation of the proposed highway under various working conditions. The quantity of the potential landslide are also estimated and the mitigation methods are also proposed in the paper. Related Articles | Metrics

Select

Seepage Preventions Measures of Buildings Near Rain Garden and Other Urban Green Infrastructures CHAI Shaobo,WANG Chuan,HU Zhiping，WANG Hao 2018, 32 (6):  582-586.  Abstract ( 625 )   Save The urban green infrastructures encourage the infiltration of the surface water but infiltration of the surface water into the building foundations are not desirable. This paper presents the studies of the seepage prevention measures of building foundations near the green infrastructures. The principles of seepage membrane and slurry wall used in the green infrastructure construction are introduced. A seepage prevention method and its optimum location are introduced. A case study of the green infrastructure construction and its seepage prevention measures are also presented in the paper. Related Articles | Metrics

Select

Statistical Study of Physical and Mechanical Parameters of Subgrade Soils in Coastal Hebei Province LI Qian, FU Xu, LIU Xiaoli, ZHOU Huiwen, WANG Daguang 2018, 32 (6):  587-589.  Abstract ( 530 )   Save The geotechnical investigation results of subgrade soils in coastal area expressway between Chikou and Haifeng are statistically analyzed. The variation, correlation and probability properties between the physically indices and the mechanical properties are evaluated. The following conclusions are observed: 1)variations of specific gravity, unit weight, and degree of saturation of subgrade soils in coastal Hebeiare very small. These parameters can be treated as constant in the engineering applications; 2)high correlations can be found in following: Compression coefficient and moisture content; compression coefficient and unit weight; compression coefficient and void ratio. Among these parameters, the compression coefficient and unit weight have negative relations, whereas, other pairs are positive correlated. 3)the probability distribution of moisture content, void ratio, and liquid limit have a logarithmic normal distribution and other indices have normal distribution. Related Articles | Metrics

Select

Construction Control Methods of a Shielded Tunnel Over Crossing an Existing Operating Metro Tunnel LU Guoliang1, LIU Bin2, YANG Lei2, FENG Xingren2, CHEN Baoguo3 2018, 32 (6):  590-593.  Abstract ( 933 )   Save It is not unusual in the construction of an urban rail transit tunnel underneath the existing structures. However, it is rare for a shielded tunnel that is over crossing the existing operating metro tunnel at a close distance. The challenge in the construction was the safety as well as the stability of both new shielded tunnel and the exiting operating metro tunnel. This paper presents a case history of constructing the shielded tunnel zone in Qianwan Station of No.5 Line. The new shielded tunnel would over cross the existing operating No. 11 tunnel between Nanshan and Qianwan stations at a very close distance. The measures to ensure the construction safety and stability were used. These measures included soil improvement, excavation parameter control of the shielded tunnel excavation, automatic and live construction instrumentation monitoring as well as emergency response backups. Related Articles | Metrics

Select

Optimization Design and Analysis of Deep Excavation Internal Strut Supported for an Integrated Utility Culvert in Pintan HU Hongliang 2018, 32 (6):  594-598.  Abstract ( 548 )   Save This paper presents a case history of Value Engineering design and analysis of the internal strut supported deep excavation for an integrated utility culvert in Pintan. The original excavation support option was the drilled and castinplace reinforced concrete piles with one castinplace reinforced concrete waler supporting system plus two layers of steel pipe strut supporting system. The first castinplace reinforced concrete waler system in the original design had the disadvantages of low construction efficiency and high cost, and therefore, the optimized design converted into steel pipe strut support. The excavation sequence was simulated through a threedimensional finite element analysis using PLAXIS software. The stressstrain in the original and new supporting system were compared. The results indicate that, the maximum bending moment in the optimized system was 637.6 kNm/m or varying from 0.82% to 3.09%. The lateral deflections at the supporting system were similar with only 0.33% to 1.36% reduction. It was therefore concluded that the stressstrain changes in both system were not significant. The new supporting system was applied in the construction. From the construction monitoring results, the safety of the excavation could be ensured and the internal supporting system was reliable and was cost effective. The construction schedule was also accelerated. Related Articles | Metrics

Select

Live Deformation Monitoring and Control Analysis in Deep Excavation Projects LIU Wenjin 2018, 32 (6):  599-601.  Abstract ( 535 )   Save This paper presents a case history of live deformation monitoring and control analysis of a deep excavation project. The deformation and stress in the excavation supporting structure were live monitored so that the excavation process could be controlled and adjusted based on the feedback from the monitored data. As the results of live monitoring and control, the construction safety could be ensured. Related Articles | Metrics

Select

Influence of Foundation Excavation on the Uplift Resistance of Single Piles ZHANG Wen1,2, TANG Feixiang2, XU Mei2, LU Chunming1 2018, 32 (6):  602-604.  Abstract ( 566 )   Save The uplift resistances of test piles and production pile for a deep excavation project in Rugao, Jiangsu Province, were compared throughout the static uplift loading tests and large uplift difference were identified between two piles. The uplift resistance value from the code suggested formula was much greater than that of the production pile inside the excavated area and this difference was exceed from the reasonable range due to the soil strata variation. The further evaluation concludes that the deep excavation reduces the normal pressures on the pile and unloading of the soil at the bottom of the excavation induces the rebound of the soil. As results from the soil rebound, an upward friction (similar to the negative friction) developed in the production pile was the major reason for the uplift resistance reduction. Related Articles | Metrics

Select

Train Vibration Induced Settlement of Tunnel Excavation in Losses HUO Xiaobin1, LUO Zhongming1， YANG Fanjie2, LI Pan2， ZHANG Wangjie2， JIN Yunzhe2 2018, 32 (6):  605-610.  Abstract ( 425 )   Save Loess tends to collapse or disintegrate under the cyclic load. Therefore, the operating train load might impose a safety threat to the construction of tunnel in loess soils near the existing rail lines. This paper presents a case history of a tunnel excavation in loess soils of Anjiazhuang Line near an existing rail line. The potential vibration induced settlement in loess soils surrounding the tunnel excavation was evaluated through the site-specific soil property testing. Compared with the original loess soil samples, the compression modulus of samples that subjected to vibration can reduce as much as 73% and the cohesion reduction of 43.5%. The internal friction of vibrated loess soils samples remained unchanged. The evaluation results indicated that the loess soil surrounding the tunnel excavation area can have 5 times greater settlement of the soils that without the vibration at the most unfavorable locations. The preventive measures included supporting the upper portion of the portal and lateral support of inside the excavation. These measures improved the safety of the tunnel excavation in loess soils. In the following excavation, early supporting and lining also played an important role in the successful tunnel excavation in loess soils. Related Articles | Metrics

Select

Review of Engineering Property Improvement and Modification of Sand By Geosynthetics ZENG Weixing1, MENG Qingshan2, CAO Zhenzhong1， FAN Chao3 2018, 32 (6):  611-615.  Abstract ( 540 )   Save In this paper, the properties of geosynthetics and their practical engineering applications are reviewed. The test methods and results of the mechanical behavior at the soil reinforcement interface are also presented. The following conclusions can be drawn: ①Various test are applied to obtain the soilreinforcement interface shear strength and the results are different. From the highest shear to the lowest, they are: plate test, direct shear test, pull out test and triaxial shear test. ②The poorly graded coarse or fine sand have a better interface shear strength due to the higher adhesion in the uniform graded particles. Whereas, the well graded sand samples have a lower interface shear strength due to the “lubrication effect” from particles of different sizes. ③When the backfill soils are predominantly silty, clayey sands or dandy silt, sandy clays, the moisture increase will fill in the voids among particles and even dissolve some cementations and therefore results in a decrease of the interface shear strength. When the backfill soil consisting predominately sandy soils, the increase of moisture content can increase the interface shear strength. ④When the increase of unit weight or normal stress will increase the interface shear strength of sandy soils. Compared with other geosynthetics, geogrids have the threedimensional structure, and therefore, have a better interface shear strength potential for they have a moment resisting and can divert the upper stress to a larger area below the geogrid structure. This property of geogrid can effective improve the bearing capacity of sandy soils. The literature review also indicates that the standardization of laboratory test of geosynthetics still has a long way to go due to the lack of standardizing of test equipment, test procedure as well as the understanding of testing mechanism. It is very important that the laboratory testing should be able to simulate the practical engineering applications.  Related Articles | Metrics

Select

Lateral Earth Pressure Coefficient Under Various Soil Stress States SONG Zheng 2018, 32 (6):  616-619.  Abstract ( 1292 )   Save The lateral earth pressure coefficient is an important parameter in the calculation and analysis of earth pressures and is one of the influence factors on the earth pressure distributions. This paper presents a new earth pressure formula under different failure planes and friction angles of the back of the retaining wall. The results from the new lateral earth pressure formula are compared with the results from the classical formula. The results indicate that, when searching the planar failure plane using Coulomb method, the lateral earth pressure coefficient is a constant, which is consistent with the Coulomb earth pressure coefficient. Under the curved failure plane assumptions, the lateral earth pressure coefficient is not a constant and the active lateral earth pressure coefficient increase with the decrease of the friction angle of the back of the retaining wall. The passive earth pressure coefficient, however, has the reverse trend. The paper also concludes that the nonlinear lateral earth pressure coefficient change with the curved failure plane assumptions is due to the nonlinear behavior of soils.  Related Articles | Metrics

Select

Stability Analysis of Embankments Strengthened by Sliding Resistant Caissons Using Strength Reduction Method SHAO Qiaoxi1， HU Rong2 2018, 32 (6):  620-624.  Abstract ( 422 )   Save The stability of fill embankment is an important topic in the geotechnical engineering field. This paper presents a case history of stability analysis of sliding resistant caisson improved embankment using strength reduction approach. The effect of embankment different dilatant angles on the embankment stability was investigated. The results indicate that, at the beginning of the failure, a plastic zone was developed at the toe of embankment and the plastic zone would progressively develop upward and formed a continuous plastic zone when the embankment is failed. The dilatant angle of embankment soil has a significant effect of the embankment stability. The factor of safety increases with the dilatant angle. Using the sliding resistant caisson can effectively improve the development of plastic zone above the caisson and therefore improves the embankment stability. Related Articles | Metrics

Select

Seepage Analysis of the Tailing Dams Constructed on Flat Ground with Complex Subsurface Conditions ZHOU Dan1, CAO Jigang2 2018, 32 (6):  625-628.  Abstract ( 467 )   Save The seepage field is one of the important factors that affect the safety and stability of tailings dams. This paper presents the numerical tailing dam stability analysis results. The seepage analysis considers the site specific subsurface conditions under normal flood and design highest flood conditions. The resultant phreatic lines and seepage gradient are obtained. It is concluded that under two different flood levels, the seepage fields of the tailing dam are similar. Related Articles | Metrics

Select

A Soft Clay Constitutive Model Considering Rheological and Structural Properties and Its Engineering Applications WEI Xinjiang1,2, TANG Jie1,2, SUN Miaomiao2， FANG Huajian3 2018, 32 (6):  629-632.  Abstract ( 481 )   Save A soft clay constitutive model is developed based on the elastoplasticity theory and using modified CamClay model as the boundary surface. In the model, a shape factor is introduced to define the horizontal axis length of the ellipse yield surface, at the time a structural parameter is used to describe the structural damage strain. The parameters can be calibrated by conducting the laboratory one dimensional consolidation and triaxial rheological tests. This model was used to estimate the longterm settlement of a sea levee improved by surcharging method. The results indicate that the new constitutive model has the advantage of describe the behavior of the structural soft clays, compared with the conventional soft clay models. Related Articles | Metrics

Select

Strength Characteristics of Red Clay Reinforced by Cement Microstructure Analysis GONG Zilong1, SUN Gangchen2, HU Yuefa2, LIU Feng1 2018, 32 (6):  633-636.  Abstract ( 604 )   Save To investigate the effect of cement content on the Guilin Red Claycement mixtures, an extensive laboratory test program was developed. Mixture samples with different cement content and age on the strength and microstructure changes were tested with the unconfined compressive strength and analyzed with scanning electronic microscope (SEM). The results indicate that the clay particles formed the granular and needle like materials after adding cement. These soilcement reaction products can fill, connect and cement clay particles and formed harder soil aggregate, therefore, improve the strength of soilcement mixture. When the cement content is less than 20%, the increase of cement content can accelerate the form of harder aggregate and increase the early strength of mixtures. The strength of the mixture increases with the curing age. When the cement content is greater than 20%, the harder aggregate has formed with certain amount of cement and therefore, the increase of cement content will not significantly increase the strength of soilcement mixtures. Related Articles | Metrics

Select

Study on Strength and Particle Shape of Calcareous Sand Particle CHEN Huodong1,2, WEI Houzhen3, FENG Zheng1,2, ZOU Yuanjing3 2018, 32 (6):  637-641.  Abstract ( 567 )   Save It is necessary to study the strength of a single particle since its individual strength might govern the shear strength of the soil or rock mass. The uniaxial compression tests on the individual grain with three different average particle sizes was performed on three different average calcareous sand particle sizes using a house made single particle strength testing device to evaluate the relationship between the vertical load and the correspondent displacement. An optical microscope was used to obtain single particle contour images and an image processing software was used to extract shape parameters. Particle shape parameters were used to evaluate the particle breakage forms under different particle shapes. Three types of breakage models corresponding to the particle shape parameters were derived. The Weibull distribution theory was used to calculate the particle strength. The average particle sizes are 1.79 mm, 3.63 mm, and 8.15 mm. The corresponding characteristic stress of the particles are 11.23 MPa, 7.31 MPa and 4.62 MPa, respectively. The characteristic strength of the particles decreases with increasing particle size with a strong size effect demonstrated. Related Articles | Metrics

Select

The Major Difference Between the British Standard and Chinese Standard in Geotechnical Engineering: Example Projects in Uganda HUO Zhiliang, MENG Qinglin, FAN Lipin, WANG Hui, LIU Chao 2018, 32 (6):  642-645.  Abstract ( 3244 )   Save With the development strategies of “One Belt One Road”, more and more oversea projects are constructed. It is therefore necessary to have a better understanding of British Standards and other testing standards in these overseas projects. Evaluation of the differences between the British Standard and Chinese Standard can better guide the geotechnical investigation in abroad. In this paper, efforts were made to investigate the similarities and differences in existed in both standards in areas of geotechnical engineering investigation, soil laboratory as well as in-situ tests. The?rationale is?almost identical, but there are differences in soil classification, plastic?index?chart, equipment?specification of limit and shear test. The paper describes the outlines of geotechnical investigation procedures by using example?projects?in Uganda. Related Articles | Metrics

Select

Discussion of Construction Dewatering WU Lujun 2018, 32 (6):  646-649.  Abstract ( 652 )   Save Groundwater related engineering problems are frequently encountered in the infrastructure projects, such as, highway, railway, harbor and airport and industrial and residential building constructions. This paper does not deal with the treatment of groundwater as a resource or the treatment of polluted groundwater. The groundwater related construction issues are discussed in this paper. Related Articles | Metrics

Select

Seepage and Stability Analysis of High Fill Embankment with Debris Under Rainfall Events DENG Kailun, LIU Hong, LIU Xingxing， ZHOU Ji 2018, 32 (6):  650-654.  Abstract ( 562 )   Save The rainfall is the main environmental factor that triggering landslides. The soil types and degrees of compaction of the backfill materials will directly affect the rainwater infiltration pattern within the embankment. The transient seepage field of high fill embankments subject to the rainwater infiltration is simulated by an unsaturated seepage finite element software. The element stress field is obtained by the finite element method. The element stress is then applied to the limit equilibrium analysis. The slope stability under the seepage action under the precipitation conditions can therefore be analyzed. The results show that the degree of compaction of limestone gravelly soil between 90%-95% have a good performance under seepage conditions. It is also stable under the strong rainfall events. The results will provide scientific basis for selecting backfill materials and minimizing and mitigating hazards induced from strong precipitations. Related Articles | Metrics

Select

Safety Assessment System for Power Transmission Tower Foundations YANG Yong, WANG Guanyu, ZHANG Fangzheng, HU Yunshi, LIANG Yueji 2018, 32 (6):  655-657.  Abstract ( 519 )   Save This paper presents a safety assessment system for power transmission tower foundations using hierarchy process and comprehensive fuzzy judgment approach. This foundation safety evaluation system software was developed by using Microsoft VB 6.0 programming language and could automatically evaluate the safety of power transmission tower foundations. This software includes two major modules: power transmission tower foundation information management module and foundation safety evaluation module. The software has the advantages of friendly user interface, easy to operate and clear outputs. The software development strategy and algorithms are introduced and the fuzzy evaluation approaches on the input data are also applied in the system. Related Articles | Metrics

Select

Construction Process of Modern Wood Residential Structures in Japan SHI Lingyi 2018, 32 (6):  658-664.  Abstract ( 982 )   Save The wood structures have been very popular in the history of Japan. The modern wood structures are open for the individual residential homes consisting of two major portions. The upper wood structure is made of wood load carrying structures of flooring and frames, whereas, the lower portion is usually made of cast-in-pace reinforced concrete frame structures. Comparing with the traditional wood structures, this modern wood structure combined with reinforced concrete structure has the advantage of higher strength and improved seismic performance. In addition, the water and moisture proof work and thermal isolation work of the first floor are significantly improved. This paper presents construction details of modern wood residential structures in Japan.  Related Articles | Metrics

Select

Discussion of Subsurface Soil Design Shear Strength for a Metro Station in Suzhou ZHAO Chong， LI Jian 2018, 32 (6):  665-667.  Abstract ( 754 )   Save The design shear strength values of different soil layers for the design and construction of a metro station in Suzhou City obtained from various laboratory tests were statistically analyzed. It is concluded that the shear strength values from different test methods, such as, unconsolidated undrained direct shear, consolidated undrained direct shear, unconsolidated undrained triaxial shear, consolidated undrained triaxial shear, are different. Further, significant variation in shear strength values could be obtained from different test methods. The cohesion values obtained from the undrained unconsolidated direct shear are higher than those of from consolidated undrained direct shear tests. The internal friction angle, other the other hand follows the reverse relationship. The internal friction angles from silty clayey sample in triaxial unconsolidated undrained shear test re very small and close to zero, which is the theoretical value. The cohesion values obtained from triaxial unconsolidated undrained shear test are higher than 〖JP2〗those of from unconsolidated undrained direct shear tests. Under total stress conditions, the internal friction angle and cohesion values obtained from consolidated undrained triaxial shear tests are higher than those of from direct shear tests. Related Articles | Metrics

Select

Testing of the Large Size Granite Gravel Gradation Selections GUO Zhiguo, TAN Bo， YUE Aijun 2018, 32 (6):  668-671.  Abstract ( 894 )   Save The optimized coarse granite aggregate gradation selection tests were performed using interference of particles and Talbol’s theory through three different compaction methods: heavy compaction, vibratory table, and hand compaction. The objective of the testing was to obtain the optimized gradation of granite aggregates with a maximum grain size of 53mm. The results indicate that optimized gradation should have the ratio of the main grain size D0 (26.55～53mm) : D1 (4.74 ～26.5 mm) = 6:4 and a Talbol Index n =0.5. Under a moisture content of 4.2%, the maximum dry density of 2.327 g/cm3 can be achieved by the heavy compaction method. This dry density is 1.037 time of the dry density prepared by vibratory table and 1.12 time that of prepared by hand compaction. The content of grain sizes between 04.75 mm has 6.8% change under heavy compaction method. This content is 1.19 times that of prepared by the vibratory table method and 1.097 times that of prepared by the hand compaction method. Higher dry density has better mechanical properties. Related Articles | Metrics

Select

Large-scale Direct Shear Test of Shear Strength Characteristics of Blast Furnace Slag Modified Mixture LIU Xiang1, ZHANG Chao1, XU Youjun1, GUO Peng2 2018, 32 (6):  672-675.  Abstract ( 547 )   Save  Blast furnace slag is accumulated as waste of smelting metal around steel mills. It occupies land resources and pollutes the adjacent environment. This paper presents a large scale directing program on the blast furnace slag samples in order to apply these waste materials in the soil improvement projects. The impact of sand content in slags on the shear strength of the mixtures were thoroughly investigated.  The results indicate that, the shear strength of slagsand mixture increases with the sand content to a maximum value at sand content of 23.79%. After this sand content, the shear strength decreases rapidly with the increase of the sand content. The sand content has larger influence on the apparent cohesion, which increases with sand content to a maximum value and then decreases with the sand content, whereas, the sand content has less impact on the internal friction angle of the slagsand mixtures. From the engineering point of view, the sand content should be controlled to be under 23.79% when the slagsand mixtures are used in the soil improvement projects. Related Articles | Metrics

Select

Model Test of Reinforced Earth Retaining Walls Under Complicated Load Conditions Acting of the Top of Wall HUANG Cong1, YU Wencheng1,2, WANG Zhibing1,2， HE Hongfa1 2018, 32 (6):  676-680.  Abstract ( 539 )   Save This paper presents a laboratory modeling program of reinforced soil retaining wall under complicated loading conditions. The optimized reinforcement and reinforcing spacing were investigated throughout testing. The facing of the retaining wall panel was simulated by white paper cardboards and the reinforcement straps were simulated by Kraft paper types. The backfill material in the mechanically stabilized earth wall system was clean sand. Three different reinforcement spacings were studied. The model test results indicate that the combination of primary and secondary reinforcements can effectively reduce the total reinforcement quantities with a satisfactory facing movement control. The use of secondary reinforcements can effectively share the loading carried by the primary reinforcements and also improve the degree of compaction neat the wall panel. Related Articles | Metrics

Select

Test Analysis of Fully Bonded Buoyancy Anchors in Soft Rock WANG Xiaowei 2018, 32 (6):  681-684.  Abstract ( 688 )   Save This paper presents test results of static incremental loading and cyclic loading test results of fully bonded buoyancy anchors in soft rock mass. Various parameters, such as, stressdeformation, bonding length, allowable anchor deflection and bonding strength between anchor and soft rock, are evaluated. The following conclusions could be reached: the deformation characteristics of the fully bonded anchors in soft rock start with the elastic, elastoplastic and finally, full plastic stage would be reached; An allowable deflection of 10 mm at the head of the anchor can be used; the maximum bond length of 4 meters can be used and the average bond strength, frbk,  of 127 kPa can be used in the design. Related Articles | Metrics

Select

Monitoring and Analysis of Ground Movement at Kaziwan Landslide Zone LI Chunxia, XIAO Shirong, YUAN Qianbo, WANG Tao， HOU Zhenzhu 2018, 32 (6):  685-688.  Abstract ( 621 )   Save This paper presents a case history of ground movement monitoring analysis for Kaziwan landslide zone. Based on the large scale geological site reconnaissance, investigations and monitoring data analysis, it is concluded that ground movements at the potential landslide zone are strongly related to the reservoir pool water fluctuations and precipitations. Potential influence factors, such as, structural geology, ground movement of the sliding zone and monitoring data are evaluated. The following conclusions can be drawn: 1)At the beginning phase of reservoir pooling, the raise of water table had a significant impact on the stability of the slopes at Kaziwan. 2)under fluctuation of polling water table, the ground movement demonstrated a staged shape: no significant movement was monitored when the pooling water raise but large movements were observed when lowering the pooling water. The strong precipitation would also accelerate the rate of deformation. 3)under the cyclic poling water fluctuation, the rate of deformation of the sliding body gradually reduced. Related Articles | Metrics