不同开采条件下巷道围岩支护反力理论分析

目前对深部巷道围岩表面变形理论计算公式仅限于截面为圆形的巷道,但在工程实例中多采用矩形巷道.就目前常见的深部开采条件,采用面积等效原理进行理论分析和数值模拟分析,即将矩形巷道采用等面积原理等效于相应的圆形巷道来计算围岩表面的变形.考虑不同截面尺寸,不同巷道埋深及不同岩性这3个因素,分别选取5个水平,进行正交试验设计出25组不同开采条件下巷道围岩表面变形.初步设计出各开采条件下的最佳支护方案,并在此基础上确定淮北袁店二矿101运输巷道控制围岩稳定的合理锚杆支护参数.

On theoretical analysis of roadway supporting reaction forces under different mining conditions

At present, the deep roadway surface deformation theory formula is limited to circular cross-section of roadway, but rectangular roadway is used in the actual engineering. In this paper, according to the current common deep mining conditions, the corresponding circular roadway surrounding rock surface deformation is calculated on the basis of theoretical analysis and numerical simulation analysis of equivalence principle. Con- sidering the different cross-sectional dimensions, different depths and different lithology, and five levels were selected for lower roadway surface deformation orthogonal design of 25 different sets of mining conditions. We can take preliminary design of optimal supporting scheme to determine the bolting parameters of No. 101 transportation roadway of No. 2 Yuandian mine in Huaibei for reasonable control stability of surrounding rock of roadway.