Based on the analysis of the ultrasonic wave attenuation of crack damage in rocks,the connection of damage parameter D with attenuation coefficient a has been formulated. The crack set has been formed,by which the distribution character of flaw length and quantity can be expressed.

The results have shown that tile multiply law of crack damage in rock can be reflected from the linear slope of quality factor decrement ΔQ_p changing with the stress ratio<σ>.

This paper has do some research in-depth about the application of boundary element method in joint fissure damage rock mass on the basis of formers' work, several boundary element programs which apply in different kind rock mass are empoldered.

By using comprehensively the cracking mechanics and damage theory, the structural relation of fractured rock mass under the complicated stress state and the rule of crack starting of Compresso shear shear fractures are probed into, the damage evolution equations of fractured rock mass under compresso shear and tenso shear conditions are established, and the relation between seepage tensor and the development of fracture and damage, and the coupled model of unsteady state seepage field and damage field in fractured rock mass are put forward.

A significant aspect of the theory is the introduction of a crack damage state variable which quantifies submicroscopic crack damage prior to macroscopic failure of the material.

A first order differential equation governing the time evolution of the crack damage variable is developed based on first principles of statistical physics.

We have used the complex electrical data to produce a direction-sensitive (anisotropic) crack damage parameter, and used it to calculate the effective Young's modulus by employing the models of Walsh and Bruner.

This modelling is an improvement on similar curves produced using isotropic crack damage parameters derived from acoustic emission data.

Hypothesis tests are builtupon the (conditional) probability density function of crack damage that does not requirethe solution of stochastic differential equations in either Wiener integral or It? integralsettings.

In recent years, concept of continuous damage mechanics was applied to investigation of failure and fracture of rock and the like materials. A model was set up to simulate strain-softening effect of rock, in which rock was regarded as a damageable material with inherent micro-fissures. First of all, a thermo-dynamic formula and a model of finite deformation of rock were established in co-moving coordinates. Then a rock damage evolutional equation was proposed by the authors based on theory of fuzzy probability...

In recent years, concept of continuous damage mechanics was applied to investigation of failure and fracture of rock and the like materials. A model was set up to simulate strain-softening effect of rock, in which rock was regarded as a damageable material with inherent micro-fissures. First of all, a thermo-dynamic formula and a model of finite deformation of rock were established in co-moving coordinates. Then a rock damage evolutional equation was proposed by the authors based on theory of fuzzy probability measurement,and on micro-analysis and macro-observations. Finally, it was proved by the data obtained from labs that simulation of strain-softening effect of rock by a model is acceptable.

To deal with the seepage in jointed rock masses, a coupled mechanical-hydraulic analysis model is developed in this paper. According to this model, the jointed rock mass, to be treated as an anisotropic, porous damaged medium with the corresponding elastic compliance and permeability tensors, is hydraulically equivalent to the discontinuous mass. The mechanical behaviours of the medium are described by a fracture damage model, while the hydraulic equivalents are formulated on the assumption that joints in rock...

To deal with the seepage in jointed rock masses, a coupled mechanical-hydraulic analysis model is developed in this paper. According to this model, the jointed rock mass, to be treated as an anisotropic, porous damaged medium with the corresponding elastic compliance and permeability tensors, is hydraulically equivalent to the discontinuous mass. The mechanical behaviours of the medium are described by a fracture damage model, while the hydraulic equivalents are formulated on the assumption that joints in rock masses can be reproduced by a set of parallel planar plates. To estimate the interconnection between joints, a series of stochastic crack networks are established by computers with Monte Carlo technique on the basis of in-situ observation and statistical procedures to characterize joint orientation. The effect of seepage on mechanical behaviour of joint et rock mass and the effect of stress states in rock masses on its conductivity are discussed in detail. According to the processes of joint crack propagation under different stress states in rock masses, a set of evolution rules governing the permeability tensor variation are established. Finally, a numerical analysis FE-program with the coupled model proposed above is developed and applied to the rock engineering.