According to the damage mechanism of rock materials, a set of constitutive equations with temperature effect taken into account has been obtained by means of introducing two damage variables into endochronic theory. The constitutive equations can be used to describe the rock material deformation process at different temperatures and under different loadings. The damage variables represent respectively hydrostatic stress decrease in void rate and fracture due to deviatoric stresses. The parameters in the constitutive equations can be determined by uniaxial stress-strain curves. Experiments on marble samples have been performed in the temperature range of 20℃-500℃ at an interval of 50℃ and all material parameters in constitutive equations were determined by experimental results.

Based on reviewing the published papers on the multi-reaction of lime-soil system, this paper makes a wide range of discussed on the physio-mechanical properties of stabilized soil. Besides the macro-properties, the micro-mechanism of strengthened soil is also studied. With powder X-ray diffraction, it has been shown that the cementitions material—Calcium Silicate( Aluminate) Hydrate (CS(A)H) is produced by the slowly lime-soil reaction during long curing time or high temperature circumstance, using prosimetry analysis, it is suggested that the cemetitions material increases in quantity with the curing time and results in a gradual replacement of capillary pore space with fine gel pores. The micro-fabric of soil samples indifferent ages under the scanning electric microscope sheds some light on setting the relation between strength increase and curing time, that is the producing of CSH gel, then forms a poorly crystallized material which can make a strong bonding of soil particles. Other chemical additives’ role in increasing strength and factors that may possiblely influence the effect of lime stabilization in practical application are also approached.

The inverse problems, with a bright future are in the forefront of both theoretical and applicational science researches within the international scope. Especially the studies in exploring the variations of physical parameters in closing objects by using acoustic wave or seismic wave methods are paid great attention to, because of its relation with many domains such as mathematics, mechanics, physics and computer science and its wide applications in geological exploration, engineering and medicine. This sort of problems can be included in the category of determining coefficients terms in a partial differential equations in mathematics. The previous researches are based on the elastic media model. A model of coefficient inverse problems of wave equation in viscoelastic media is proposed in this paper, which describes characteristics of geological media more truly. The finite element method and the least-squares inversion process are used to solve the inverse question of plane viscoelastic wave equation in the frequency domain. A numerical perturbational algorithm has also been employed for obtaining the gradient matrix quickly and accurately. Singular Values Decomposition (SVD) produces significant improvements in computational precision. Based on above-mentioned studies, the authors have compiled the computational programs. Some numerical examples, showing the validity and practicality of the model and the numerical algorithm, are also given.

Based on load transferring concept, this paper presents new method of analyzing negative friction of piles. This method is not only suitable for an end-bearing pile but also for a friction pile. Some comparisons are made between measured and predicted distribution of down drag forces of piles in layered strata. The results show that the agreement between theory and observation is satisfactory.

An endochronic dilation model for marine soils on the basis of Gibbs free energy and stress intrinsic time scale is presented and used to found pore water pressure(pwp) equation to predict pwp under undrained uniform or non-uniform cyclic ocean-wave loadings. The equation is used for performing numerical simulation and prediction to some previous and writer’s cyclic test data. It is shown that equation provides a reasonable description for pwp under undrained cyclic loadings. The model is concise and its basic parameters are few and easy to decide. It is convenient to apply the model to the analysis of liquefaction potential under ocean-wave loading. The mechanism the progressive increase of pwp during undrained cyclic loading is also illustrated well by the model.

The properties of a newly-developed polymeric material, shotcrete for increasing tenacity and strength are described firstly, then the assessment is made, through lab, and field tests, on the effects of tenacity and strength increasement of this material. And finally the exploratory research is carried out to the mechanism of tenacity and strength increasing effects.

A brief introduction is given to the properties of model RAP-1 dynamic pile testing apparatus and more detailed descriptions are given to the functions, operation SAMPLE /D sampling soft-ware system and PAP/4A analyzing soft-ware system of RAP-1 as well as to the auto-processing for pile testing data from dynamic parameter method Case method. SAMPLE/D and PAP/4A are complete in function and easy to operate, which can compensate the inadequate waveforms caused by the changes of some conditions in field measuring and reduce the errors in data analyzing. They can not only he used for in-situ real time analyses but also for analyses after testing.

Expert system is a newly developed discipline. It has been widely used in various fields. This paper analyzes the properties of expert system and evaluates the expert system application in geotechnical engineering.

In this paper, a new method of dual secondary coils for linear variable differential transformer(LVDT) transducer is described. The transducer has the capability to compensate the variation in ambient temperature and the influence of factor with an unstable transducer's excitation, etc. The experimental results show this compensating transducer is stable and suitable to both favorable and unfavorable environments.

A kind of special strain-gauge with large strain capacity has been developed and applied in the measurement of tensile deformation for geotextiles. A variety of feasibility tests of tensile deformation measurement with a large capacity strain-gauge for soft material, geotextiles are presented in detail. The tests for reinforcement of soft foundation both in lab. and in field are made with the help of this kind of strain-gauge. Many key technical problems of large capacity strain-gauge applied in deformation measurement for geotextiles are found and solved through lots of tests.