深部近距离保护层开采煤柱矿压显现规律

Mine Pressure Behavior of Coal Pillar in Deep Close Distance Protective Seam Mining

针对平煤五矿己16-17-23190回风巷在附近工作面回采中的矿压显现的规律,进行了现场实测和数值计算分析。监测数据显示,己16-17-23190回风巷煤柱中部区域存在6 m的应力降低区,应力降低幅度为60%,距离采空区边缘12 m。综合现场监测和数值分析结果,得知采动压力的超前影响距离为80 m,滞后影响距离为40 m,侧向影响距离为40 m,煤柱区域在采空区边缘0~12 m区域内为高应力集中区。综合分析结果,得知在平煤五矿己16-17煤层保护层采面布置时,煤柱宽度取值15 m较为合理。同时,在采掘布局时,需避开采动引起的高应力集中区,从而避免采动压力使掘进巷道产生严重变形。

For the strata behaviors at mining face of Ji16- 17 --23190 return air roadway in Pingdingshan Coal Group No. 5 Coal Mine, we carry out field measurement and.numerical analysis. Monitoring data show that there is a stress reducing area with 6 m in the central area of coal pillar in Ji16- 17 -23190 return air roadway, and stress reduction is 60%, 12 m away from goaf edge. Comprehensive field monitoring and numerical analysis results, we found that the advanced influence distance of mining pressure is 80 m, lag distance of 40 m, lateral influence distance of 40 m. Coal pillar area on the edge of mined - out area 0 to 12 m is high stress concentration zone. Comprehensive analysis of the results, we found that during the arrange of the protective layer in Pingdingshan Coal Group No. 5 Coal Mine Ji16-17 of coal seam mining face, coal pillar width value of 15 m is reasonable. At the same time, high stress concentration caused by mining should be avoided during mining arrangement to avoid the roadway deformation by mining pressure.