摘要
Abstract
Aiming at the problems such as large deformation of the surrounding rock,difficulty in maintaining the roadway and others when adopting retaining roadway along goaf in Yuecheng Coal Mine,taking the 2303(upper)working face retaining roadway along goaf roadway as the research object,a combination method of numerical simulation and on-site monitoring is used to study the rock stratum overburden rock migration law of the roof cutting and pressure relief stope.The numerical simulation analysis results show that the instability period of the low-level key layer in the 2303(upper)working face stope is 20 m;Compared to the roof cutting on the coal pillar side and upper side,roof cutting on the working face side can enable the roadway side of the coal pillar side to play a bearing role and is beneficial for controlling the roof of the stoping working face;When the roof cutting angle is 70°,the pressure relief effect is optimal,which can effectively control the mine pressure and coal pillar stress concentration in the stope.The on-site pre-splitting blasting test shows that the optimal roof cutting and pressure relief scheme is to cut the roof in the direction of the working face,with a roof cutting angle of 70°,a blast hole length of 10 m,and a blast hole spacing of 2 m.By monitoring the change in the surrounding rock after pressure relief,it is found that the stability of the filling bodies after roof cutting is relatively good,and the deformation amount of the roadway surrounding rock is relatively small.关键词
沿空留巷/切顶卸压/岩层运移规律/数值模拟Key words
retaining roadway along goaf/roof cutting and pressure relief/rock stratum migration law/numerical simulation分类
矿业与冶金
