下保护层开采卸压保护范围及可行性分析

Analysis of Pressure-relief Protective Range and Feasibility of Under-protecting Coal Stratum Mining

基于有限差分计算方法,对李雅庄矿下保护层开采进行数值模拟分析,得出下保护层开采时被保护层应力分布、变形规律及卸压保护范围等,同时借助模拟结果,运用有效隔水层突水系数法对下保护层突水危险性区域进行划分,并对保护层开采可行性进行分析判断。结果表明,下保护层开采后卸压保护层角为50°左右,下保护层开采不可行。

Based on finite difference method, the numerical simulation analysis on under - protecting coal stratum in Liyazhuang mine is carried out, the stress distribution, deformation laws and pressure - relief protective range of protected coal seam are achieved. Mean- while, according to the simulation results, using water inrush coefficient method of effective waterproof layer to divide water inrush risky area of under - protecting coal stratum, the feasibility of protective coal seam mining is analyzed and judged. The results show that the under -protecting coal stratum is not feasible when the pressure -relief protective angle reaches up to about 50°after mining under - protecting coal seam.