Abstract:

The inference of alteration zone thickness and side pressure coefficient to abnormal stress distribution was studied by systematic numerical simulation. Using the test design method of orthogonal and uniformity and  applying the analysis method of finite difference method produced regular results. On the basis of the riverside hydropower station tunnel,  the influences of the alteration zone to the distribution of ground stress and rockburst degrees were studied, and  some useful conclusions were obtained.

Key words: alteration belt; rockburst; ground stress; numerical simulation