In this paper, the infinite boundary elements developed previously in two and three dimensional problems are reviewed, and the shortcoming and irrationality of interpolation functions of those elements are pointed out. A new interpolation function of infinite boundary element is proposed. The divergent integration on infinite element is also discussed in this paper.

In this paper, the whole process of initiation, propagation, and failure of rectangular plaster plates with cracks under dynamic loading is described in detail. Based on the theories of fracture dynamic and stress wave, the testing results are analysed, and the fracture law followed by the plates with cracks under dynamic loading is given.

In this paper, the potential of marine soil liquefaction caused by wave loading is evaluated. This evaluation is based on the testing results from lab. And site of South Sea, China. This evaluation is also compared with the results from different methods.

The sublevel caving method is used in No.4 ore body of Fusan Iron Mine, and large scale stratum movement took place there for four times in the past a few years. Many kinds of instruments, such as AE monitor, convergence meter, etc., are used to study the law of stratum pressure appearance. On this basis, oblique stopping lines and proper support system are adopted, so that the stratum movement is controlled, and continuous production of iron ore is realized with an extraction rate of eighty two per cent.

The theory and technique of combined trinity-reinforcement are studied to solve the problems risen from the field where surround rock masses are very soft and fluid-like collapses occur. These theory and technique are of unique advantage, with which obvious economic effects are gained.

Fracture mechanism, initiation and propagation of cracks, and the control method of cracks in rock like brittle material under dynamic load are described in this paper.

The HA-1 type instrument used to measure soil thermal parameter is briefly described in this paper. This instrument can measure soul thermal conductivity quickly with thermal needle method. A group of artificial compacted kaolinite samples are tested with this apparatus, and the testing results show that the thermal conductivity varies regularly with the change of water content and dry density of soil.

An inductive strain digit measuring device with 8031 single chip microcomputer has been designed high resolution. In this paper, the problem about random quantization is discussed. Random quantization is used to improve accuracy of computation. State method and interruptable subroutine nesting technique are applied to the soft desing. The testing results show that the device structure described in this paper is rational enough to satisfy the technical requirement of measurement.

Model DWZY-1 intellectual displacement apparatus-one of the newest research achievements in our institute, which transfers physical parameters, such as displacement, force, vibration, stress, strain, into digital output signals (through different transducers). DWZY-1 is a modern measuring apparatus which can interprete and plot measured data automatically.

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.

The Institute of Rock and Soil Mechanics was founded in 1958, which is one of the research bodies under the Academia Sinica (National Academy of sciences). Four divisions (of Rock and Soil Dynamics, Rock Mechanics, Soil Mechanics, Electronic and Mechanical Design ) and one factory have been set up in the light of the needs for research tasks. In addition to these units, there is an information research division and a computer department. More than 300 staff are now working in this Institute, about half of the employees are technical staff and scientists. Since founded thirty years ago, more than 220 items of major research topics has been Completed by our Institute. Of which 210 items of major scientific and technical contributions have been obtained. Among them 8 won the national prize, containing 1 piece of national invention prize and 36 won the significant result prize issued by Academia Sinica, HuBei province or ministries. Many results approach or come up to advanced level of the world and much more results reach the national leading level. In order to promote the academic activity and its engineering services, the Institute of Rock and Soil Mechanics takes pleasure inviting international cooperation in the field of geotechnical engineering science.

This paper is written for the 30th anniversary celebration of the founding of our institute . the development and achievements of rock dynamics in the past 30 years in our institute are summarized briefly. The prospect for further development of rock dynamics in our institute, including some opinions and suggestions about the research topics to study, are also made in this paper.

The research achievements about weak intercalated layers of bedding rocks are presented in this paper, which were made by the author and his colleagues in the past 30 years. A lot of work made are related to the stability analyses for slops of large-scale open-pit minings, and for bed rocks of key water conservancy projects. The emphasis of this paper is put on shearing testing method in-situ, and the research results of deformation and strength properties of weak intercalated layers.

he research work on acoustic characteristics of rock and soil in laboratory in the past 20 years is reviewed in this paper. Some topics of this work are described and analysed.