This is a summing-up report of the topic on development of constitutive modelling of geological materials both in China and in the world since 1985,presented in the Third National Symposium on Numerical and Analytical Methods in Geomechanics held in Zhuhai, Nov. 9-12, 1988. In this report, a brief description of relative papers submitted to this symposium is also made.

This is a summing-up report of specific topic, presented in the Third National Symposium on Numerical and Analytical Methods in Geomechanics. A summary description and review are made in this report based on the papers, submitted to this symposium, on application of numerical methods geomechanics.

This is a summing-up report based on 48 papers on the applications of numerical method to soil mechanics. Recently, there is a new development of coupling of finite element with other numerical ones in soil mechanics. The dynamic numerical analyses have found further application to nonlinear stress-strain relationship, effective stress, and three dimensional problems. The suitable contact element or conjunct element could be used for contact conditions in finite element calculation. It is an important direction to combine usual numerical method with probabilistic method, which has been used in evaluations of consolidation effect, slope stability, dam, seepage, deformation calculation, interaction, and the performance analyses of pole and foundation.

This is a summing-up report of the topic on application of numerical and analytical methods to geotechnical engineering, presented in the Third National Symposium on Numerical and Analytical Methods in Geomechanics. The application to rock mass and engineering is emphasized in this paper, based on the papers submitted to this symposium.

In this paper, the basic idea of Roberts algorithm is presented, and a new improved algorithm is proposed. The new algorithm is faster, simpler and more applicable to many problems than Roberts’ one. Based on this new algorithm, program TDFEP is developed, which is executable on microcomputer. With this program, a three dimensional object can be viewed from any direction in the space, and 3D-perspectives are formed. 3D-perspectives take an important role to check original data of finite element calculation, which can improve the efficiency of the whole calculation process obviously.

This paper introduces the contents about engineering geological properties of soil mass presented in the 3rd National Conference of Engineering Geology, held in Chengdu, Sichuan, Dec. 1988. Based on this, the engineering geological properties of soil mass and their researching developments are described, in view of some kinds of soil distributed in China, or with specific characteristics. Such as loess, expansive soil, dispersive soil, red clay, marine clay, and fly-ash soil.

The nonlinearty of rock deformation results mainly from closing, opening, and propagation of microcracks or microviods inside rock. Taking the influence of microdefects into account, a new constitutive relationship of damage is developed, and applied to different models of rock with different porosities. The theoretical curves consist with the experimental ones.

A rock dynamic triaxial machine with high pressure is developed for the needs of Defence Engineering, Explosive Engineering, Scismic Engineering, and the work related to high pressure and high rate condition. The machine can be used to study the stress-strain relation of rock or other materials under dynamic and static triaxial condition. High pressure and fast loading rate are the features of this experimental machine. Rock testing study can be done with this machine under the conditions of confined pressure from zero to 1000 MPa and axial pressure from zero to 4000 MPa. The loading time from zero to peak takes only 4-9 ms. The strain rate can reach 10° 1/sec. The main parts of the triaxial experimental machine, the principles of dynamic loading, and the measurement under high liquid pressure, etc. are described in this paper. In addition, the test results of the stress-strain relation, strength, deformation, the effects of strain rate, etc. obtained with this machine are presented, too. This machine fills in the gaps of dynamic high pressure machine in China.

A data collection and process system is developed for RDT-10000 Type Rock Dynamic Triaxial Machine with High pressure, this system is supported by several subroutines in 6502 assembly language, which is of high-speed, flexibility, multi-functions.