近距离煤层重复采动面过沟谷矿压显现规律研究

Research on strata behavior rule of mining face of close distance coal seams in valley terrain condition

针对神东矿区活鸡兔井近距离煤层重复采动工作面过沟谷地形时易发生动载矿压的问题,采用物理模拟与现场实测方法,研究了沟谷地形下覆岩主关键层被侵蚀程度对浅埋煤层动载矿压的影响。结果表明:浅埋煤层工作面在过沟谷地形上坡段时,因覆岩主关键层受侵蚀影响而缺失,使主关键层缺少侧向水平挤压力作用而产生滑落失稳,从而导致下煤层工作面过沟谷地形上坡段时易发生动载矿压。据此确定了类似条件下工作面过沟谷地形上坡段时支架所需合理的工作阻力,保障了该矿后续工作面的安全回采。

According to the problem of dynamic strata pressure when the working faces are affected by repeated mining of close distance coal seams under valley terrain, the paper researched the influence of the erosion degree of primary key strata in valley terrain on dy- namic strata pressure of shallow coal seams using physical simulation experiments and field measurement. Result shows that when the working face is advanced in the uphill section of valley terrain, the dynamic strata pressure is always generated for the primary key stra-ta is missed by erosion. The reasonable working resistance of supports for working faces advancing in the uphill section of valley terrain was determined that can guarantee the mining safety of subsequent working faces.