厚煤层刀柱采空区下分层复采工作面矿压规律研究

Study on Pressure Behavior of Repeated Mining Face under Pillar Goaf of Thick Coal Seam

针对虎峰煤矿2#煤层刀柱式采空区下分层复采工作面矿压规律显现异常等现象,根据SMP准则得到煤柱极限稳定宽度为7 m,采用数值模拟与现场实测进行研究。得出工作面过煤柱时,支承压力显现为"弱-强-弱"的规律;工作面过跨度较小的采空区时,支承压力显现为"强-弱-强"的规律,工作面过跨度较大的采空区时,支承压力显现为"强-弱-强-弱-强"的规律。

Aiming at the abnormal phenomena of pressure behavior of repeated mining face under pillar goaf of No.2 coal seam in Hufeng mine, according to the SMP criterion, the limit width of the coal pillar is 7 m, numerical simulation and field test are used to research. When the working face passes the pillar, the support pressure shows the law of ＂weak-strong-weak＂, when the working face passes the goaf with small span, the support pressure shows the law of ＂strong-weak-strong＂, when the working face passes the goaf with big span, the support pressure shows the law of ＂strong-weak-strong-weak- strong＂.