2004 Vol. 18, No. 2

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Application of Transfer Matrix in the Problem of Dynamic Load below the Earth Surface
Zhou Hailin
2004, 18(2): 55-58.
[Abstract](30) [PDF 181KB](4)
Abstract:
The theory of liquid saturated porous medium is quoted to analyze the displacement and force in the sand when there is dynamic load below the earth surface. Through the axial symmetry supposition and the laplace Hankel transformation, the laplace Hankel aralytial form of the vertical dynamic load in saturated sand is obtained by using the dyramic transfer matrix.
Numerical Simulation on Inflence of Residual Stength on Macroscopic Behavior of Rock Failure
Liu Wenbin, Tang Chunan, Tang Liexian
2004, 18(2): 59-63.
[Abstract](50) [PDF 254KB](5)
Abstract:
By RFPA2D (Rock Failure Process Analysis) Code,the failure processes of lots of rock specimens are simulated under uniaxial test.The influence of residual strength on elasticity,brittleness and plasticity of rock is mainly studied.The results of numerical simulation show that the residual strength has great effect on elasticity,brittleness and plasticity of rock,with the increase of residual strength,rock specimens perform more plasticity and higher peak compression strength.
Research and Realization of Three-dimensional Object-oriented FEM Analysis Program
Chen Zhuo, Deng Anfu, Duan Xiaoyu
2004, 18(2): 64-67,95.
[Abstract](28) [PDF 421KB](5)
Abstract:
Calculation analysis has a important weight in engineering investigation and application.Process Oriented Programming(POP)has many disadvantages in readability,code use ratio,exploitation period,maintenance and so on.Therefore combination of the FEM and Object Oriented programming(OOP)method has become a tendency in the filed of geotechnical engineering. The Object Oriented programming of finite element software with language C++ is developed which solves three dimensional interaction problems of raft foundation and soil.It is a useful attempt to study FEM by Object Oriented method.
Stereographic Projections Analysis Program
Wang Haibin, Li Yongsheng
2004, 18(2): 68-71.
[Abstract](49) [PDF 196KB](5)
Abstract:
Stereographic projections analysis is an effective method to appraise the rock slope stability with structural plane.Abstract theories,complex graphic method and drawing inaccuracy limit the application of the method. The program of stereographic projections analysis can solve the problem efficiently.
Stability Assessment for the Surrounding Rock Mass of Natural Cave
Chang Shipiao
2004, 18(2): 72-73,77.
[Abstract](51) [PDF 137KB](7)
Abstract:
The Instability of natural cave is absolute and its stability is relative. Among the top, base and lateral wall of natural cave, the stability of top is most important, which dependent on some factors, sach as the formation mechanism, the stratfied condition, the section figure, the conditon of fissure and water seepage, the time of formation and stabilization, the geological formation and etc.
Gray Prediction to the Settlement of Pile Foundation
Chen Zhibo, Jian Wenbin
2004, 18(2): 74-77.
[Abstract](25) [PDF 305KB](6)
Abstract:
A GM(1,1) model is established by Gray Theory using observation data of loading tests for pile. The model can be used to predict the unknown part of p-s curve of pile loading tests. The result of study shows that GM(1,1) model can effectively predict the settlement of pile foundation, and be of the theoretical and actual meaning for further analysing the bearing capability of pile foundation.
Three-Dimensional Finite Element Analysis about Characteristic of Differential Settlement of Foundation Supported by Different Type Piles
Huang Bin, Yang Min, Xiong Juhua
2004, 18(2): 78-82.
[Abstract](28) [PDF 231KB](5)
Abstract:
Recently more and more attentions are given to the variable rigidity design method for controlling differential settlement, The three dimensional(3-D)finite element method is used to discuss the relation between settlement and rigidity of foundation supported by different type piles.A design method is presented to control differential settlement by changing types of piles and layout of piles.A case study shows that this method can be used to reduce the differential settlement and prevent second stress.
The Test Study of Pre-Stress Bolt in Excavation Supportion
Tao Xigui, Tan Yuehu
2004, 18(2): 83-85.
[Abstract](51) [PDF 289KB](9)
Abstract:
Through the test study of tension and distortion of the pre stress bolt in a deep foundation pit, Some profitable conclusions are obtained, which can offer some references for the application and spread of pre stress bolt in soft soil area.
Analysis on the Deformation and Consolidation of the Soft Ground Improved by Dry Jet Mixing Piles
Luo Xiyuan
2004, 18(2): 86-89.
[Abstract](44) [PDF 375KB](8)
Abstract:
Taking the results of the test on the soft foundation improved by DJM piles on the Guangzhou Zhuhai Qusai High speed Railway for example,the settlement of the soft ground,the transverse differential settlement of the ground,the deformation of the piles between two sides of the embankment,the distribution of the pore water pressure and the consolidation of the ground are analyzed.
Application of Computerized Geophysical Tomography in Exploring Bad Geologic Body of Tunnel
Cai Chengguo
2004, 18(2): 90-92,109.
[Abstract](31) [PDF 391KB](4)
Abstract:
The CT imagining technique and the basic principle of converse deduction method are expounded. Through the case of a tunnel's exploration, it shows that the imagining profile produced by SIRT method has very highly accuracy, which has the particular advantage of judgment for the grown zone of karst, crack and rock crush.
Study on the Constitutive Equation of Foundation Soils with Branching Strata and Its Application
Wang Chunhe
2004, 18(2): 93-95.
[Abstract](26) [PDF 265KB](4)
Abstract:
There are often some branching strata in the foundation soils of engineering.Through grouping the branching strata in mechanical property,and considering the influence of branching strata to the constitutive relationship of integral foundation soils,the constitutive equation of foundation soils with branching strata is obtained,which offers a new thinking way to solve the constitutive relationship of foundation soils with branching strata.By using the theory stated above,the elastic parameters of transverse isotropic foundation soils can be obtained considering the varity of elastic parameter with depth.
The Stability Judgement Based on Extensive Angle Method in Deep Excavation
Hu Qiang, Shao Guojian, Liu Ning
2004, 18(2): 96-99.
[Abstract](48) [PDF 391KB](5)
Abstract:
The methods applied in stability of foundation pit are summarized,and then their merits and shortcomings are compared.Based on the interference-energy theory,the extensive angle method is applied in the judgement of the stability of foundation pit.Finally,it is applied in stability judgement of the deep excavation of Run Yang bridge,and the results indicate the foundation pit is stability.
Study on the Further Development Technique of ANSYS and Its Use
Li Xinpo, Yuan Wenzhong
2004, 18(2): 100-102.
[Abstract](48) [PDF 262KB](5)
Abstract:
Some important techniques are discussed to the problems in designing calculation of retaining piles on ANSYS system. The problem can be solved by the method of programming with APDL. Also, the method is used in the calculation of piles with prestressed anchor cable and the results are reasonable compared with that acquired by routine method.
Evaluation Method of Slope Stability and Its Developing Trend
Yang Xuetang, Wang Fei
2004, 18(2): 103-106.
[Abstract](42) [PDF 190KB](6)
Abstract:
The ordinary evaluation methods of system stability of slope are introduced.Then the main principle,character,merit and shortcoming of each evaluation method are pointed out. Finally its developing trend is proposed and discussed.
The Experimental Research on New Type of Grouting Material Consist of PVA and Sodium Borate
Zhang Haiqing, Zhang Yumin
2004, 18(2): 107-109.
[Abstract](45) [PDF 144KB](6)
Abstract:
Through determining the viscosity of the new grouting material consist of PVA as main agent and Sodium Borate as crossing linking agent, and testing the intension of consolidated rock,the grouting capacity and intension of this grouting material are analyzed.On the basis of research,the grouting technique is presented.

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