Evaluation method of geological mechanic for surrounding rocks in design of bolt support for seam gateway

Base on the analysis on in-situ rock stress affected to the mine roadway surrounding rocks, the paper introduced the method to obtain the rock mechanics parameters. According to the basic quality classifications of the rocks and the stability classifications of the mining gateway surrounding rocks, the paper provided new classification scheme and parameter determination of the rock project quality classes for mine roadway surrounding rocks. Base on the characteristics of the bolt supported roadway, the geological mechanic parameters related to rock completed characteristics can be concluded as a generalized index with a certain method, which is as "quality index of the rock project". Then a classification was made for the index. The index could be the basic geological mechanic index for digital simulation analysis with the strata stress, which could be the scientific geological mechanic parameters for the digital simulation analysis.