NUNERICAL SIMULATION STUDY ON 3D COMPREHENSIVE SHEAR STRENGTH OF FRACTURED ROCKMASS

Applying stochastic theory to establish a 3D probability distribution model of discontinuities network is an important research subject of utilizing the computer programming technique in the field of rock mechanics.This technique obtains the original data of discontinuities from the in-situ investigation by sampling window method and creates a probability statistics distribution model of discontinuities geometric parameter;then,Monte Carlo method is adopted to build up a 3D discontinuities network model;finally,3D discontinuities network model is obtained with the help of computer.Based on the 3D discontinuities network model,the persistence is determined and the 3D shear strength indexes are provided by searching for the critical path of combined failure of the discontinuities and rock bridge.During the process of search,genetic algorithm which has obvious biological background is applied.