煤巷锚杆支护设计中的围岩地质力学评估方法

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

在分析原岩应力对巷道围岩的影响基础上,介绍了岩石力学参数的获取方法,在岩体基本质量分级和回采巷道围岩稳定性分类的基础上,提出了一种新的巷道围岩岩体工程质量级别划分方案及参数确定,针对锚杆支护巷道特点,按一定方法将反映岩体整体特性相应的地质力学参数归结为一个统一指标,即“岩体工程质量指标”,并对其进行分级,并与地应力一起作为数值模拟分析的基本地质力学指标,为进行数值模拟分析提供了比较科学的地质力学参数。

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.