2013 Vol. 27, No. 2

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Development and Creation
Balance Thrust Method on Stability Calculation of Retaining Wall
Xiong Daokun, Xiong Jingsi
2013, 27(2): 55-58,68. doi: 10.3969/j.issn.1007-2993.2013.02.001
[Abstract](61) [PDF 694KB](8)
Abstract:
There are several problems in stability calculation method of retaining wall which has been widely used.The problems are:estimating the stability doesn't comply with the principles of mechanics by separating the components of acting force into two acting forces; the anti-overturning stability coefficent is uncertain due to the defects in its definition and the differences of the foundation's hardness,and repetitive with the linear eccentricity of the basement's join-force;it would cause the insufficient foundation bearing capacity that the active earth pressure is be used or the passive earth pressure is ignored.the balance thrust method is put forward so as to improve the stability calculation method of retaining wall in view of the existing problems.
Technology Probe and Research
Analysis of Lateral soil Pressure for Reinforced Earth Retaining Wall Based on Different forms of Failure
Zhang Fan, Zhu Dengyuan
2013, 27(2): 59-62. doi: 10.3969/j.issn.1007-2993.2013.02.002
[Abstract](50) [PDF 684KB](9)
Abstract:
This paper Based on designed reinforced soil retaining wall model,combined with the analysis of previous studies,through the derivation of the formulas,the earth pressure,the pseudo-cohesion,the pseudo-friction angle and the destruction forms of the reinforced soil retaining wall were studied.According to the summary,the forms of the failure mode of reinforced earth retaining wall can be divided as friction failure and pull off failure.Derived results showed that:for the different failure forms,the changes of the friction and the cohesions were different,especially for the pull off failure,the changel of the likely cohesion followed by the vertical layer spacing of the reinforcement was obvious.And it was more easier to happen the pull off failure when the filling heights were the same.
Research on Optimal Design and Application of Wholly-grouted Anti-floating Anchors
Zhao Deji, Jiang Yongbei
2013, 27(2): 63-68. doi: 10.3969/j.issn.1007-2993.2013.02.003
[Abstract](38) [PDF 673KB](9)
Abstract:
Based on particular project cases,this paper introduced the designing method of the wholly grouted anchor and the procedure thereof.Moreover,some feasible schedules for anchor bar arrangement have been optimized both technically and economically,the best schedule has been obtained.In For better popularization and application of the schedule,the primary points of project quality control in the construction of anti-floating anchors,the methods and the designing theroy,and problems which should be considered during the construction and ways for solving them.
Developing and Applying the Tunnel Monitoring Intelligence on Analysis Visualization System
Li Pengyuan, Zhang Guojun, Jiang Zongbin
2013, 27(2): 69-73. doi: 10.3969/j.issn.1007-2993.2013.02.004
[Abstract](31) [PDF 750KB](5)
Abstract:
Tunnel construction monitoring and analysis requires complex expert knowledge and data analysis,which costs too much time,and it is conflicted with the construction period demand.Aiming at above problems,the paper developed tunnel monitoring analysis visualization system based on Visual C# platform and VTK techniques,and introduced global optimization method-Difference Evolution (DE) Algorithm and combined it with finite element method (FEM) in order to back analyze the surrounding rock parameters.Expounded the computing theory of the back analysis of DE-FEM. And also applied the system to the Dalian Metro tunnel engineering construction and got satisfied results.The soft system has active meaning to promote the intelligence,visualization and automation of the tunnel construction.
Deformation Monitoring Analysis of Surrounding Rock Convergence on Baihe Tunnel
Song Guihong, Chen Jihua
2013, 27(2): 74-77. doi: 10.3969/j.issn.1007-2993.2013.02.005
[Abstract](39) [PDF 693KB](4)
Abstract:
During the unsymmetrical tunnel loading,it can produce cracking,partial migration or migration.This article focused monitoring measurements,combined from gucheng to zhuxi highway of the actual situation of the baihe tunnel,analyzed the typical section zk91+335 and its the deformation characteristics, evolution process,and the regression analysis method,the cross section of a judgment of stability,it contributed to subsequent construction of tunnel.
Research of Settlement Characteristics for High Filling Subgrade in One Beijing Highway
Song Lianliang, Chen Changyan
2013, 27(2): 78-82,86. doi: 10.3969/j.issn.1007-2993.2013.02.006
[Abstract](42) [PDF 861KB](7)
Abstract:
The settlement of high filling subgrade is one of the major factors end to some highway diseases,such as vehicle bump approaching bridge,different deformation,crack and so on.Limited by short construction period and not preloading conditions,high attention must be paid to controlling filling progress and settlement characters of subgrade.Effective measurements are taken to control some engineering problems,resulting from settlement of high filling subgrade,during highway construction and operation.Taking one highway in Beijing for example,some features of settlement and deformation of the high filling subgrade are discussed due to different foundation nature,engineering geology,and construction method in this paper.The results will offer directly scientific basis for decision of design,construction and operation of the highway.
Study of Fracture Zone Based on 3-D Geological Modeling
Lin Daming, Shang Yanjun, Lin Zhongwei
2013, 27(2): 83-86. doi: 10.3969/j.issn.1007-2993.2013.02.007
[Abstract](44) [PDF 770KB](5)
Abstract:
One of the main purpose of the three-dimensional geological modeling is to predict the spatial variation of the one or more geological variables.Terrain contour based on CSNS Engineering 278 drilling accumulated 6415m core attribute interpolation to create a three-dimensional model, and by any section of the model is compared with the actual drill core, with intuitive science advantages.
Experimental Research on Compacting Effects on Pile-Driving With Hammer
Zhang Chuan, Guo Zhongze
2013, 27(2): 87-91,99. doi: 10.3969/j.issn.1007-2993.2013.02.008
[Abstract](36) [PDF 820KB](10)
Abstract:
Relying on the Maanshan Power Plant Expansion Project #1 turbine foundation hammering penetration Pile,the site tracking and monitoring tests is carried out about the squeezing effect of piling.The changing law of deep horizontal displacement of soil,degrees of hammering penetration and soil plugging effect is analysised in detail.
Several Methods to Determine Lifting Height of Harmful Capillary Water in Saline Soil
You Sunan
2013, 27(2): 92-94. doi: 10.3969/j.issn.1007-2993.2013.02.009
[Abstract](38) [PDF 687KB](10)
Abstract:
This article had introduced several common methods about determining the lifting height of harmful capillary water, the curve intersecting method of plastic limit (PL) and water content was recommended preferentially for cohesive soil and silt according to the project features and site conditions.Based on the site practical tests and test data analysis and processing, the results demonstrated that the method is more practical, which can be applied to similar projects.
Research and Application of Settlement Control Effects of Sparse CFG-Pile Raft Foundation on High-Speed Railway
Sun Honglin
2013, 27(2): 95-99. doi: 10.3969/j.issn.1007-2993.2013.02.010
[Abstract](29) [PDF 757KB](7)
Abstract:
When low subgrade on deep soft ground in high speed railway is treated with CFG pile-wet composite foundation,it cannot ensure the long-term stability under cyclic loading and the pile cannot give full play to the advantages of high bearing capacity.So the sparse pile-raft foundation structure is applied in low subgrade on deep soft ground in ballastless track high-speed railway,and the characteristics of settlement deformation of structure,pile-soil stress and the loading deformation of raft are tested through choosing representative working points.Moreover,the design calculation method is investigated and some proposal on engineering application need further in-depth studys.
Application Analysis of Post Grouting Pile in Tianjin Binhai New Area
Wang Xinhua, Hu Bo, Yang Zimin
2013, 27(2): 100-104. doi: 10.3969/j.issn.1007-2993.2013.02.011
[Abstract](31) [PDF 685KB](5)
Abstract:
As is all know to us, Binhai New Area is on the Gulf of Bohai, the soil is relatively soft, requiring high bearing capacity for pile foundation of the tall buildings. In this case, post grouting technology of bored pile, which could improve the ultimate bearing capacity of single pile.Through the engineering examples, this text analyses placing reinforcement stress meters on the in-grouting piles and grouting piles, by comparing stress meter datas among the grouting piles and non grouting piles,we analyse friction resistance of pile-side and pile-tip was enhanced to a certain degree, which promote the post grouting pile technology in coastal soft soil area to a further application.
FLAC 3D Numerical Simulation Analysis of Mixing Pile and Composite Soil Nailing Pit
Xu Shixiong
2013, 27(2): 105-109. doi: 10.3969/j.issn.1007-2993.2013.02.012
[Abstract](43) [PDF 795KB](5)
Abstract:
In this paper,one homogeneous soil pit of 10m deep is modeled by the software of FLAC 3D,the slope,which is supported by soil-cement mixied pile and composite soil nailing supporting structure is analyzed in detail by the ways of the horizontal displacement on the pit wall.Vertical displacement on the ground and on the bottom of the pit and the axial internal force of the soil nail.Finally,the regularity conclusion about the homogeneous soil pit which is supported by soil-cement mixed pile and composite soil nailing supporting structure is summarized,which provided references to the application of Pit supporting Engineering practice.

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