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.

This paper is a summary report research work for soil mechanics division of our institute in the past 30 years. The contents of this report are rheological behavior of clay, constitutive relationship and other basic properties of soil, characteristics of some special kinds of soil and their influence on engineering, and prospect of further study for soil mechanics in this division.

The development history, research orientation, and achievements for the group of physico-chemical geomechanics in the past 30 years are reviewed in this paper. The prospect and suggestion for the further development of physico-chemical geomechanics are also made in this paper.

The main achievements of technical system in the past 30 years in our institute are summarized in this paper. The strong challenge confronted technical system in the large environment of reforms and openness is analysed. The countermeasure for technical system to come out from valley bottom is proposed and discussed. Some suggestions about the development direction of technical system are also made in this paper.

The information work is a part unable to separate with scientific research of rock and soil mechanics. The review and prospect of information work in out institute are made in brief. Some ideas about the information work for the future are also given in this paper.

A technique of peripheral presplitting blast with multi-ignitions of millisecond detonaters is put forward in this paper based on the characteristics of ridge blast for wave power station, the main ridge blasting with deep hole smooth blasting and casting blast of inclined holes. The formula to calculate explosive charge is established. Finally, the theory and process of this technique for ridge blasting are discussed.

PPT-type static-dynamic pore pressure transducer gage is developed and designed by our institute. The principle, technical behavior, calibration method, and application to practical engineering are presented in this paper.

The fundamental mechanical properties, time and crisscross effects of a kind of siltstone under different stress states and along different stress paths are studied with laboratory testing. A failure criterion, constitutive equations with one dimensional rate dependence and three dimensional volume deformation are proposed in this paper.

Engineering geological survey, field testing of physico-mechanical parameters, and numerical analysis of stability are made for a high steep rock-soil slope. Based on this, a reinforcement design scheme is proposed to keep slope stable in give period. The reinforcement method and safety coefficients presented in this paper are of reference value for similar slopes.

Based on hydrogeology and engineering geology, the storage capacity of a depression on mountain top in Chengshan is studied. The depression is estimated to have the capacity to hold 3.85 million cubic meters with a leakage of 0.96 million cubic meters in 24 hours. As result, the real storage capacity for power is 2.90 million cubic meters, which satisfies concerned departments with 2 to 3 million cubic meters to be held.

The essential principle, technical feature, and application of inductive strain gage are described in this paper. This kind of strain gage is developed by our institute and has become product with invention patent.