Based on a great number of in-situ tests, the paper presents the relationship of soil resistance vers depth and lateral displacement, the relationship of lateral foundation reaction factor vers soil indexes. Based on the principle of similitude, we have replaced non-linear FEM programming calculation with tabulation method - NL method. Case history of 39 piles has illustrated that the method is of reliable precision and practicability.

A procedure of multi-grid solution to adaptive nonlinear FEM is described in this paper. Numerical analyses on underground cavern excavatio n have shown the effectiveness of the procedure and the advantages o f adaptive multi-grid FEM in the simulation o f excavation process.

According to the principle of generalized plastic mechanics, the mathematical expression of the shear yield surface in the Lode angle θe direction is presented initially and a three-yield-surface model for soilmasses is established based on the experiment of previons researchers. In combination with the numerical example, many calculating schemes are designed. The comparison and analysis of various calculated results have shown the validity of the model. The effects caused by various factors on the deformation of soilmasses are discussed.

This paper presents a practical model for oil reservoir in field recovery. Based on stress-seepage coupled variational principles, it is proved, using the perturbation method, that the three-dimensional problem can be reducible to a modified plane-strain problem with variable thickness of the oil formation if the thickness varies slightly in the horizontal direction. The solution then obtained is the zero-order perturbation solution. The global finite element equations are given for the modified plane-strain problem. An example for secondary oil-recovery in hydraulic fracturing is analyzed numerically and the results a represented.

On the basis of the measured data from model simulation tests on rock-socketed pile groups subject to torsion, the variation and distribution laws of the measured forces in pile top, torsional moment against displacement and torsional moment against rotation are analyzed. The testing results are coincident with those obtained from rigid loading stand assumption.

The computing program of DDA is expanded and developed based on DDA computation model in this paper. Large displacements of slope and surface deformation due to underground excavation are discussed using the DDA model with results compared with those from DEM . It is shown that the results are in accordance with those o f DEM . All of the analysis proves that DDA can be effectively applied to large rock engineering.

By means of the least square method, the initial stress field parameters are identified according to the measured data of transformation of the rock when the underground tunnel is excavated. Considering the stochastic characteristic, a stochastic method to identify the initial stress parameters in rock mass is established in this paper. The affection of the stochastic characteristic of the transformation measurement is studied as well. The numerical results show that the lower the sensibility of the objective function to the identified parameters, the larger the standard deviation of the identified results, and the worse the identifiable characteristic of the parameter.

The embedded softening surface is used to simulate the propagation of fracture in rocks. Based upon the virtual work principle, the equilibrium equations of FEM considering the effect of fracture on deformation are established. And on the basis of the complement virtual work principle, the concrete matrix for the effect of fracture is deduced. As an example, the first type of fracture-cracking problem is analyzed to develop the visco-plastic constitutive relationship on crack surfaces, the visco-plastic FEM calculation procedure is then obtained. Finally , an example is simply calculated to demonstrate the rationality of the proposed method.

According to the static loading test of DJM pile compound foundation, the four types of foundations have been analysized and studied, concerning foundation bearing capacity , pore water pressure, axial stress of pile shaft, stress ratio and deformation modulus etc. Specific proper ties of DJM pile improving soft foundation have been explained systematically , thus providing theoretical basis and reference for DJM technique in pile engineering application.

The displacement measurement of multiple points in underground engineerings is expensive and very complicated. This paper presents the author’s achievement to develop a new method in which the multi-point displacement measurement can be performed using a convergence-meter. It ha s been proved that this simple and convenient method is very practical in use and inexpensive which gives highly precise results.

Two anti-earthquake design specifications for structure and railway are used respectively to judge the liquefaction of tunnel foundation of Nanjing Subway I in this paper. In two specifications, different considerations of factor influencing liquefaction, such as the depth of penetration point , content of clay , the thickness of unliquefied layer and the depth of underground water are analysed in detail. It is considered that different considerations of unliquefied layer result in difference in computations.

An unequal time-interval forecasting model of GM ( 1, 1) is established according to the grey theory in the present paper, which can be modified using the residual error GM ( 1, 1) model. The established model is proved satisfying through engineering practice.

On the basis of improving the limit equilibrium method of rigid body , the most dangerous sliding-block combination of rock slope is studied by enlightening search of information with precedence of tree-like structure depth. The global slope safety factor against sliding can be obtained using the proposed method. The method has been implemented in a computer software and the rock slope of Xiao wan arch dam abutment has been studied.

In this paper , some problems in slope stability analysis using the finite element method are discussed, concerning pre- and post- processing technique of FEM , influence of FEM mesh on precision of stress results, definition of safety factor, effective methods for allocating critical circular or non-circular slip surface.

Mud boil, one of the main railway roadbed diseases, has a direct effect on the safe run of trains, because it may cause the decline of roadbed elasticity through softening of bed and hardening of ballast. It is proved practically that chemical grouting can do with it. For evaluating the positive role of the selected super polymer to the soil in roadbed, this paper operates the dynamic triaxial test by simulating the proper ties of soil, the static stress, the cyclic dynamic stress and drainage condition in site. The results show that dynamic strength of the modified soil by super polymer increases in a considerable degree. The dynamic properties also get a conspicuous reformation. Subsequently the positive role is affirmed in engineering practice.

In this paper, the authors give firstly a computation model and the relevant FEM numerical method for the rheological-swelling rock mass, then calculate and analyze emphatically the rheological-swelling stability of surrounding rock masses of one convey tunnel in the Yellow River Diversion Project, Shanxi province, finally obtain useful conclusions.

At first, the FEA pre-processing method is discussed which is realized by ViziCAD of Super SAP. Then . DO and . NSO file format is introduced in detail which contains finite element model data ,displacements data and stresses data used by post-processing module SVIEW , and the corresponding sub-program is given at the same time. Finally, an example is given to prove that geotechnical FEA visualization can come true by ViziCAD rapidly.

Based on the static pile testing , the analysis of load transfer and settlement and a new means to reach the bearing capacity of piles are reported in this paper.

Based on the Winkler approach, the present paper proposes a mechanical model for prestressed-cable sommers by the principles of structural mechanics. A software is developed under the Visual C+ + environment , and an engineering case is calculated by this program. The reuslts show that the proposed model is reliable and practical, and will find wide uses.

This paper introduces the application of grouting to foundation of runway of Hongqiao Airport, Shanghai and discusses the problems encountered during construction. So me methods to tackle the problems are presented.

High and steep cut slopes due to excavation are a common sight in building high-grade throughways, the slopes’stability directly affect the safty of construction and operation of the roads in future. In the case of unstable rock slopes with potential sliding surfaces, the prestressed cable or bolt is usually used to reinforce the slopes so as to cut down engineering cost and shorten time limit for the project. In combination of the cut slope engineering works of an express way the present paper puts forward the designing method to reinforce the slope with prestressed cables, which is useful referentially for similar slope engineering works.

The project of large frame overhead cross constructed by jacking method in Xianyue Road, Xiamen City has some unique characteristics. In order to evaluate the stability of the upper structure of the cross and the pillar-soil compound foundation, and provide more theoretical bases for design and construction of this type of jacking frame overhead cross in future , the 2D FEM analyses for bearing-deformation of the frame structure of the cross and the pillar-soil compound foundation are carried out , and some relevant conclusions are obtained.

The rammed in-situ cast pile becomes useful increasingly. The present paper describes in detail its characters, application situation, design and key points in construction, which is helpful to the practical use of the rammed pile.

Experiments show that the classic plastic mechanics fails to reflect the real deformation mechanism of geomaterials because the classic plastic mechanics is based on the hypothesis of the traditional potential theory , the hypothesis of the associated flow rule and the hypothesis of not considering rotation of stress principal axes. The generalized plastic mechanics gives up all these hypo theses and gets all its plastic formulas from solid mechanics directly ,so it ca n be used for both geomaterial and metal.