煤厚变化区采动应力演化及其冲击影响研究

为探究深部煤厚变化区冲击地压显现机理,以山东某矿孤岛工作面为工程背景,基于矿震活动分布规律和揭露的煤层变薄带,采用数值模拟方法分析了煤层厚度变化对冲击地压的影响。结果表明:在煤厚变化区初始应力集中,且煤层越薄应力增大的程度也越大;当工作面采动推进至煤厚变化区时,这一现象更为明显。

Mining-induced stress changes and rock burst effect in thickness variation of a coal seam

In order to investigate rock burst mechanism in thickness variation of deep unburied coal seam, an island working face in Shandong Province was considered as engineering practice background. Through microseismic activities and the observed variable thickness of the coal seam along the open-off cut, the influence of coal seam thickness variation on rock burst was analyzed by numerical simulation. The results show that the increasing thickness of the thinning accentuates the increase in stresses. The phenomenon will be more obvious when mining activity approaches the thickness variation of a coal seam.