2D FEM SIMULATION FOR THE STABILITY OF SURROUNDING ROCKMASS WITH CATACLASTIC TEXTURE OF UNDERGROUND EXCAVATION

A hydraulic engineering project of a city in the northwest of China is taken as an example in the paper. It made three calculating models for the rockmass types which had been named as rock mass Ⅲ、Ⅳ and Ⅴ and it adopted 2D-elastic-plastic finite element method to simulate the stability of surrounding rockmass in low ground stress region. The simulated result shows that deformation and failure zones would be formed at the arch and both sides of excavation, but the failure zones formed at the arch of excavation are especially more serious than those at both sides.The achievement of this research will play a very important role in making progress in underground engineering projects.