浅埋群采煤层大巷煤柱合理尺寸留设数值模拟研究

Numerical Simulation on Rational Size of Coal Pillar in Allays of Group Mining in Shallow Coal Seam

基于神木张家峁煤矿浅埋煤层条件,以3-1煤层、4-2煤层、5-2煤层群采为研究背景,提出通过数值模拟手段分析煤层群采时大巷保护煤柱合理宽度,以求在保证煤层大巷的稳定前提下,既提高资源回收率,又能实现安全高效生产。数值模拟得出3-1煤层、4-2煤层和5-2煤层共同回采时的大巷保护煤柱宽度应分别为170 m、185 m和200 m,模拟结果表明合理的浅埋群采煤层条件下大巷保护煤柱较单煤层开采时留设尺寸略低,可进一步提高资源回收率。

Based on shallow coal seam in Shenmu Zhangjiamao Mine,taking the group mining of coal seam 3^-1,4^-2and 5^-2as the research background,numerical simulation was used to study the reasonable width of protective pillars in order to ensure alley stability,increase resource recovery rate,and realize safe and efficient production.The simulation obtains the reasonable widths of coal seam 3^-1,4^-2and5^-2to be 170,185,and 200 meters,respectively.The simulation results show that the reasonable pillar width of the group mining is slightly less than that of single seam mining,which could further improve the resource recovery rate.