Abstract: Wall rock mechanical response under deep high stress differs from that under shallow mining.In order to study the numerical simulation research method for the mechanical characteristics of wall rock under deep high stress environment,taking the deep mining project of a cooper mine with stable wall rocks as a case,FLAC3D is adopted to build the calculating model respectively by Moore-coulomb model and the strain softening model to analyze the stress,displacement and plastic zone of roof wall rock after deep mining.The results show that under the condition of a wide range of excavation in deep high stress stope,some individual stress index in Moore-coulomb model is less than that in the strain softening model,but the wall rock deformation and the plastic zone indexes in the strain softening model is even larger.The overall results from the Moore-coulomb model approach to be safe.So,the strain softening model can better reflect the strain softening characteristics of wall rock under the high stress environment in the nonlinear phase,and the calculation results are more close to the practice.The results also show that for deep stope mining simulation under high stress,it is difficult to obtain objective conclusion depending on only a single stress or displacement index.A variety of calculation models and a variety of analysis indicators are necessary to make comprehensive analysis and contrast in order to improve the objectivity of the calculation results.

Key words: Deep high stress, FLAC3D, Numerical simulation, Strain-softening model