摘要
在房柱采空区下煤层顶板完整性受到破坏,煤房煤柱交替出现使下部近距离煤层顶板中应力分布和破断规律受到影响。为了得出房柱采空区下近距离煤层顶板受煤柱集中应力影响机制,采用数值模拟、理论分析和物理模拟相结合的方法对典型煤矿房柱采空区下近距离煤层开采进行研究,得出结论:房柱采空区下煤层直接顶板中应力均值较低,未直接受到集中应力影响,但开采过程中由于控顶区上方顶板背负具有支撑作用的煤柱,在工作面顶板中产生偏向后方的集中应力带;受偏向后方的集中应力影响,工作面出煤柱下方区域后顶板压力仍较大且顶板易发生超前破断,顶板裂隙沿煤房与煤柱边界产生并向工作面延伸,给工作面安全生产带来不利影响。
The integrity of the coal roof beneath a room mining goaf at close range is destroyed,and the roof stress distribution and rupture regularity is affected by the alternate appearance of room and pillars in the roof of the lower near stratum.In order to get the influence mechanism of concentrated stress on the roof of the close coal seams under the room and pillar goaf,a typical coal mining practice under room and pillar goaf has been studied through numerical simulation,theoretical analysis,and physical simulation.The results have shown that the mean stress in the immediate coal roof under the goaf is lower,so the immediate roof is not directly affected by concentrated stress caused by pillars.However,concentrated stress range is generated in the roof behind the working face during mining beneath the room mining goaf because the roof above the control roof area carries the supporting coal pillar. Affected by the concentrated stress to the rear, the working face roof pressure in the area below the coal pillar is still large, and the roof tends to be fractured in advance. The roof fractures occur along theboundary between the room and pillar and then extend to the working face, which is a disadvantage for the production safety.
作者
何富连
康庆涛
殷帅峰
刘佳宇
HE Fulian;KANG Qingtao;YIN Shuaifeng;LIU Jiayu(School of Energy&Mining Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China;Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources,China University of Mining and Technology-Beijing,Beijing 100083,China;School of Safety Engineering,North China Institute of Science and Technology,Sanhe,Hebei 065201,China;Ordos Guoyuan Mining Development Co Ltd,Ordos,Inner Mongolia 017100,China)
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2020年第6期1077-1083,共7页
Journal of Mining & Safety Engineering
基金
国家自然科学基金项目(51974317,51604114)
中国矿业大学(北京)越崎杰出学者奖励计划项目(800015Z1138)
中央高校基本科研业务费专项资金项目(3142018035,800015J6,3142016002)。
关键词
煤柱
近距离煤层
集中应力
coal pillar
close coal seams
concentrated stress
