In this paper ,a practical approach to rheological behavior of joints and weak intercalations in rock mass is given .In finite element analysis with this method for a rock engineering problem ,good agreement is found in a comparison of the calculated results with the deformations measured .

Based on the principles of overlapping stress-wave of all elements charge blasting ,the basic computation graph of stress wave parameter during strip explosive charge blasting was abtained .consequently ,a computation method of open-hole blasting was postulated .combined with in situ data ,a computer program in fortran code was designed and then the calaulation of stress-wave parameter of rock mass during open-hole strip charge blasting was made ;The consistency of computed results with observed data wasfine .The laws of stress-wave propagation and the stress distribution characteristics for open and closed-hole blasting were discussed .The computed data were compared and evaluated with in situ data .these data could be used as a basis of reference in practical engineering .

This paper discusses the propagation law and reflecting relation of shock wave initiated in bi-linear increasing-hardening medium ,giving an answer to question which could not be solved better for a long time in the study of underground stress wave . The results of present paper can be used as reference for the work of study and design .

In the paper ,the experimental results of some uniaxial compression tests preformed on samples of one kind of sandstone are deseribed .The sandstone tested is discontinuous and anisotropic .It contains a large amount of tensile fission which occur along a preexisted shear fracturing zone of geological structure in the rock mass .it is suggested in this paper that the deformation and failure of this kind of rock could be divided into five stages ,and the experimental results obtained could further be used to interpret the deformation and failure of rock masses .

The whole deformation curve of rock represents important mechanical behaviour in the deformation and failure of rock .The problem has been deeply studied by numerous scientists .The author intends to deal with the whole deformation curve of rock .As the first step of study .the analogous calculation has been considered with the whole deformation curve of rock under uniaxial pressure in this paper .The mathematical expressions are developed piecewise ,and the constitutive law is given .Then ,the stress state of a rock specimen is computed for loading and unloading cycles step by step under the uniaxial pressure ,using the finite element method .A satisfactory result is obtained .The author will consider the problem about the deformation and failure of rock under the different confining pressure in another related paper .

The first section of the report presents failure shape of clay specimen and analyses of inducing sources by mohr-theory .A soft layer within the specimen can effect and control the strength and the failure shape of clay ;In the second section of the report the whole process of deformation of the clay specimen under external loads is analysed .The relationship between the deformation and strength is stated .The meaning of statical limit-equilibrium condition ,kinematical equilibrium condition and limit kinematical equilibrium is delineated .the differences under various equilibrium condition were discussed ;In the last section the use and the existing problems of the various failure criterias of soil are discussed .

Through an important modification of the conventional triaxial compression ,a new triaxial apparatus was developed by Prof .Mogi about ten years ago .this devices has made possible to study the fundamental properties of rock deformation and fracture under the more general triaxial states of stress ,in which all three principal streets are different . In order to help the designing work of such apparatus to be carried out in China ,this paper presents in detail the bases of the modifications and structural features of the true triaxial compression apparatus .prof.Mogi’s advices about design and device developed in the institute are also given.