Table of Content

22 October 2013, Volume 27 Issue 5 Previous Issue    Next Issue

For Selected:

Download Citations EndNote Reference Manager ProCite BibTeX RefWorks

Toggle Thumbnails

Select

The Application of Grouted Hollow Anchors in the Tunnel Excavation Support YE Dongfang 2013, 27 (5):  1-3.  Abstract ( 1960 )   Save This paper presents the numerical analysis results of the grouted hollow anchors in the Gangtoushan Tunnel excavation support.The mechanism of the grouted hollow anchors is briefly introduced and the commercial software FLAC 3D is used.The displacement at the top of tunnel, plastic zones within the tunnel liner and the shear stress field during the construction are compared between the grouted hollow anchors and the conventional cement mortar grouted anchors. The results suggest that,compared with the conventional anchors, the grouted hollow anchors has a better performance in terms of pressure grouting since the grouting slurry can penetrating the fissures and cracks, results in a higher anchorage force and improved rock mass. Related Articles | Metrics

Select

Application of the Sheet Pile Wall Structures in the Slope Stability Mitigations LI Qilin1,ZHOU Shaoyuan1,GAO Jie2 and LIU Fabiao1 2013, 27 (5):  4-6.  Abstract ( 1644 )   Save The application of the sheet pile wall structures in a slope stability mitigation project is presented in this paper. The linear elastic beam on soil method (K Method) is used in the sheet pile wall design and the Swedish Circular Slides method is used in the stability analyses. Related Articles | Metrics

Select

Soil Improvement Methods in Treating the Collapsible Loess Soils ZHENG Xiaojiao1,ZHANG Lijia2,WANG Jing2 2013, 27 (5):  7-9.  Abstract ( 2194 )   Save The characteristics of the foundations on collapsible loess strata are briefly introduced in this paper.The case histories of soil improvement methods in the collapsible soils are also presented. Related Articles | Metrics

Select

Analysis and the Mitigation of a Slope Failure at the Oil Storage Area BIAN Shourong1,CHEN Guixi2  2013, 27 (5):  10-12.  Abstract ( 1824 )   Save The slope failure mitigation is commonly encountered in the geotechnical engineering. The selection of an optimized cost effective mitigation scheme among the various technically feasible methods and ensuring the long term safety of the mitigated slopes are the aspects that worth further discussing. This paper presents a case history of a slope mitigation project for the oil storage area.The characteristics of the slope failure are described and several feasible slope mitigation methods are also proposed.The selected method is then finalized based on the optimization evaluations. Related Articles | Metrics

Select

Mitigations of No Return Slurry Incident in ThreeAxisSoil Mixing in Thick Silty Soils QI Junqiang1,GU Guorong2,LIANG Bing3 2013, 27 (5):  13-15.  Abstract ( 2456 )   Save This paper presents a case history of the mitigation of no return slurry incident in the three-axis soil mixing for a deep excavation support project in Suzhou. Throughout the exploratory soil borings and laboratory testing, it is suggested that the groundwater conditions changed during the dewatering and piling operations in the silty and sandy soils. The disturbed silty and sand soils are the main cause that resulting the no slurry returning. Adding the bentonite into the soil strata would significantly improve the returning of the slurry in the soil mixing. Related Articles | Metrics

Select

Discussions of Grouting in Karst CHEN Jun1,2 2013, 27 (5):  16-17.  Abstract ( 1995 )   Save The karst terrain consisting of soluble carbonate rock is widely distributed in China. The construction projects in the karst terrain are often encountered some adverse conditions, such as, bearing capacity and differential settlements. It is necessary to improve the karst conditions using various methods to meet the performance requirements. This paper presents a grouting method for the local treatment of a building over the karst terrain. Related Articles | Metrics

Select

Soil Improvement Techniques for the Auxiliary Building Foundations of aPower Plant in Shouzhou,Shaanxi Province LI Guiqing 2013, 27 (5):  18-19.  Abstract ( 1924 )   Save The subsurface conditions of a coal burning power plant in Shouzhou,Shaanxi Province,are the collapse loess soil with medium collapsible,Class II,according to Chinese Site Investigation Code.The soil improvement methods for the auxiliary building foundations for the 2x300MW generator units are discussed. Related Articles | Metrics

Select

Analyses of Shangxintian Landslide HAI Zhen,LIANG Liang，FU Diaojin 2013, 27 (5):  20-22.  Abstract ( 1932 )   Save The potential Shangxintian landslide has a serious adverse effect on the construction and the future operation of the Wudongde Hydropower Plant and its dam.It is therefore necessary to conduct an extensive safety evaluation on its stability.The two dimensional stability analyses are performed based on the geotechnical investigation data.The results indicate that,under the normal conditions,the target slope is stable; under the storm rain condition,it is marginally stable.But,the stability under the seismic conditions is dramatically reduced with a factor of safety of 1.07. Related Articles | Metrics

Select

Stability Evaluations of the Slope at the Left Abutment of a Reservoir WU Zuguo,YIN Guosheng，WANG Yaobang 2013, 27 (5):  23-26.  Abstract ( 2141 )   Save The stability of the slope at the left abutment of abutment of a reservoir is evaluated in this paper. The overburden soil layer is above elevation of 1548.0 meters. The bedrock daylights the abutment slope. During the construction, tensile open cracks were observed at the rear of the slope. It is also observed that shear cracks distributed along the front toe of the slope. It is concluded that this soil movement was triggered by the vibrations from the compaction roller and other construction equipment. The original soil structures were destructed by the excessive vibrations. The lapse of the slope supporting measures could not eliminate the gradual deformation of the slope. The tensile cracks at the crown of the slope are widened and result in a landslide. The slide body was three dimensional monitored and evaluated by using the site specific geotechnical parameters. The impact of this slide on the adjacent buildings is also evaluated in this paper. The results indicate that, the slide body is marginally stable and the slope failure is likely under the heavy rain condition. The engineering mitigation is needed on the slide body. Due to the small scale of the slide body, the impact on the adjacent buildings is negligible and the slopes behind the slide body are stable. Related Articles | Metrics

Select

Relationships between the Maximum Dry Density andthe Index Properties of Clay LI Yonghe 2013, 27 (5):  27-30.  Abstract ( 2173 )   Save Cohesive soil is one of common soil type in the coastal and southern part of China. Although cohesive soil has low bearing capacity and difficulties in compaction comparing those of cohesionless soils, it is still widely used in the engineering projects. The optimum dry density throughout the compaction is the key for a successful project. This paper discusses the relationships between the maximum dry density and the index properties of cohesive soils. Related Articles | Metrics

Select

Application of RBF neural network in rockburst prediction ZHANG Deyong,WANG Yuzhou,ZHANG Zhihao 2013, 27 (5):  31-33.  Abstract ( 1462 )   Save Rock burst is one of the main geological hazards in underground constructions at the high stress areas, so it is very important to be able to predict rock burst in an accurately and timely manner. Rock burst prediction has developed from using a single indicator to using multiple and comprehensive indicators. Radial basis function (RBF) neural network is an integrated prediction method. In RBF neural network design, network is designed as high dimensional space curve fitting, in which lowdimensional model inputs is transformed to highdimensional space through hidden layer.In this way,the nonlinear mapping between the input vectors and output vectors is established. Based on several theoretical criteria specific to the project,the established RBF neural network model is applied to rock burst prediction for a real project.The results of prediction are consistent with the actual situation. Related Articles | Metrics

Select

Analyzing of the stability for the tailing dams XIE Jilong,WANG Daichao,FENG Qiyuan 2013, 27 (5):  34-36.  Abstract ( 1764 )   Save Tailings dam is the structure constructed with refuse.The heterogeneous nature of the construction material,complexity of construction history,and the coupled interaction between stress field and seepage field makes the seepage and stability analysis difficult.GeoStudio software was used to analyze the seepage condition of a tailing dam in operation.Seepage analysis was performed to obtain the phreatic surface before and after the proposed construction to increase the height of the tailing dam, along with the degree of saturation,and flux.The information obtained from seepage analysis was then used in slope stability analysis to assess the factor of safety for proposed construction. Related Articles | Metrics

Select

The effect of seepage during excavation CAI Lianjin，CHEN Zhibo，LI Fangzhen，WANG Teng 2013, 27 (5):  37-40.  Abstract ( 1924 )   Save A comparison study was performed to assess the effect of considering seepage in foundation pit excavation,using twodimensional finite element analysis (FEA).The following were predicted using FEA:settlement of ground surface outside the foundation pit,heaving of the bottom of excavation,strut reaction and displacement.The results show that the predicted deformation considering seepage is greater than that without seepage. Related Articles | Metrics

Select

Analysis of the Construction Supports for a Hammer HeadPier in Heishanhu Lake Bridge YANG Bo1，ZhANG Peng2 2013, 27 (5):  41-43.  Abstract ( 1605 )   Save A continuous cantilever beam(hammer head type)is divided into four segments:Block Zero,Cantilever,Support and Closure.Block Zero is the first construction segment in the hammer pier construction.It has the characteristics of densely reinforced,complicated cross sections with complicated stress distributions and containing many embedded parts,as well as having large selfweight. Therefore,the construction quality of Block Zero is critical to the safety and the stability of the entire hammer head pier.As an effective technique in the hammer head pier construction,the analysis method for the Bracket Support is very important.This paper presents a case history of the analysis of the Bracket Support in the Block Zero construction of the Heishanhu over LanXin Rail Line Bridge piers. Related Articles | Metrics

Select

Study on the Longitudinal Decoupling Coefficient of Airdecked Charge for Tunnel LIN Yun1,CHENG Kang2 2013, 27 (5):  44-47.  Abstract ( 2103 )   Save During tunnel outline excavation,airdecked charge as a newtype technology is being used gradually.The decoupling coefficient will directly influence the result of smooth blasting.Using rock mechanical properties obtained from airdecked charge testing site of tunnel excavation in Dabie mountain,and CowperSymonds failure criterion,a double arch decoupling charge blasting model was established by using LSDYNA,to obtain decoupling charge blasting stress and simulate the process of blasting stress over time. The stress of hole wall and its damage situation was analyzed in the case of the chargelength at 1.4m,1.5m,1.6m,1.7m and 1.8m,from which an optimum longitudinal decoupling coefficient in the range of 1.94 and 2.18 was obtained for Rock Class III in the hole depth at 3.5m.This offered a theoretical foundation for the parameters for presplitting and smooth blasting. Related Articles | Metrics

Select

Evaluation of and Mitigation of a Slipped Soil Deposit WANG Haijian 2013, 27 (5):  48-49.  Abstract ( 1876 )   Save A soil deposit slipped during the construction of Liyuan Hydropower Station. The causes of the sliding was analyzed. Various measures were taken to control further development of the sliding. Monitoring data suggest that measures selected were effective in stabilizing the deposit. Related Articles | Metrics

Select

Dynamic Environment Analysis of a Coral Sand Island in the South China Sea YE Haimin,ZHOU Hui,ZHONG Xiaoshuai 2013, 27 (5):  50-52.  Abstract ( 1549 )   Save Some coral sand islands have experienced gravel loss in recent years due to natural and human factors.A coral sand island in Xisha was studied as an example.Features of the marine environment including tideway,tide and wave,were analyzed utilizing the dynamic environment data of the South China Sea.With field testing analysis,remote sensing and other methods,the evolution process such as development and formation of the island were revealed.This paper also proposes management of the loss of coral sand, and provides a reference to the key technologies and approaches for exploitation and protection of the coral sand island. Related Articles | Metrics

Select

FEM BackCalculation of a large size diversion tunnel WANG Yanxia,ZHANG Yuelin 2013, 27 (5):  53-55.  Abstract ( 1620 )   Save A 3DFEM model was established on the MATLAB platform to backcalculate lateral pressure coefficient for a large size diversion tunnel from insitu stress measurement.The backcalculated results indicate the FEM inversion method proposed is feasible and provides a reference for the design,construction of the supporting system of the diversion tunnel. Related Articles | Metrics

Select

Inclinometer Monitoring Techniques in Preloading Projects NI Yong 2013, 27 (5):  56-59.  Abstract ( 1676 )   Save Using the inclinometer monitoring of a soft soil preloading treatment project in Jiangmen City,Guangdong Province as an example, this paper describes the components of the inclinometer monitoring system and summarizes the precautions in the process of monitoring, presents the plots of depthdisplacement curves, displacement ratetime curves.This paper also discusses the warning value of the inclinometer monitoring,and the phenomenon of the probe jumping from one groove to another groove during inclination monitoring, and the refloating measures for the inclinometer. Related Articles | Metrics

Select

Study on Assessing Concrete Quality Using Radial Ultrasonic Transducer PENG Liangjie1，LIU Peng2 2013, 27 (5):  60-63.  Abstract ( 1919 )   Save Ultrasonic transmission method was used to assess the monolithic concrete footing for highrise buildings.A number of simulation tests were performed on footing with cored testing holes.Radial ultrasonic transducer was used to inspect the density of monolithic concrete footing and similar concrete structures.Precautions during the test are also presented in this paper. Related Articles | Metrics

Select

Analysis on Shear Strength of Red Sandy Clay Using Laboratory Testing GAO Meiben,CHEN Guoqing，XUE Demin 2013, 27 (5):  64-66.  Abstract ( 1710 )   Save This paper analyzes the shear strength of red sandy clay obtained from direct shear tests.The correlation between shear strength and sand fraction was obtained using least square method and fitted into polynomial function expression. Related Articles | Metrics

Select

Application of the Transient Rayleigh Wave Method to assess the Quality ofGrouting in Karst in HeFu Passenger Rail Line YAN Kuanghua 2013, 27 (5):  67-69.  Abstract ( 1739 )   Save This article describes the detection principles,main characteristics of surface wave exploration technology and its application in the inspection of subgrade grouting in karst area in HeFu passenger rail line,along with validation of the data from water injection and core sampling.The results indicate that surface wave exploration is a simple,fast and cost effective way to provide results with highresolution visual presentation. Related Articles | Metrics

Select

Regression Analysis of Monitoring Data during the Tunnel Excavation WANG Yuanzhu1，LIANG Cheng2 2013, 27 (5):  70-72.  Abstract ( 2088 )   Save The regression analysis method can provide an effective guidance for the changes in the tunnel design and construction. This paper presents a case history of the construction displacement monitoring at the top of the Wujialing Tunnel in 03A Bid Document in DanjiangkouTusiya(DanTu)primary highway.During the tunnel excavation,the time effect on the deformation in the New Austria Tunneling Method(NATM)was applied in the construction and the regression analysis was performed on the deflection data collected at the crown of the tunnel.The time relationships with the surrounding rock mass are obtained.These relationships can provide guidance for the subsequent design and construction changes. Related Articles | Metrics

Select

Evaluation of Data from the Pile Integrity Tests DU Yong 2013, 27 (5):  73-75.  Abstract ( 1963 )   Save This paper presents the basic methods of evaluating the pile integrity test data and methods of interpretation of pile installation quality.The key technical aspects in various testing methods are also summarized. Related Articles | Metrics

Select

A Rapid Data Processing Method for the Combined AtterbergLimits Testing Using Excel Spreadshet ZHANG Sheng1,2，AO Dahua1,2 2013, 27 (5):  76-78.  Abstract ( 2472 )   Save By reviewing the data processing methods of Attergerg Limits test of soils,the authors propose a rapid data processing method by use the Excel Spreadsheet.This method has the advantages of fast,accurate,and easy implementation.The method can also be used to improve the data processing skill of the testing technicians. Related Articles | Metrics