Based on the results of underground observations and model tests of simulated materials of immediate roof, it is expounded that fragmented roof belongs in cataclastic rock mass,and its caving characteristics is clarified in this paper too.

Practice of anchoring and grouting in large-deformation cataclastic rock tunnels;

Laboratory similar model test investigation of prestressed anchor rope strengthened slope fractured rock mass;

Analysis of influence of discontinuous plane on strength of rock mass based on unified strength theory;

Computing joint persistence ratio and strength of rock mass by using rock discontinuity network simulation;