【摘要】 采煤工作面顶板岩层主关键层及其破断距的确定对于采场矿山压力控制至关重要。以白皎煤矿采煤工作面硬软交替岩层的复合顶板为研究对象,采用相似模拟试验研究、关键层理论分析和数值模拟计算相结合途径确定复合顶板主关键层及其破断距。研究结果表明:该工作面顶板第1～3硬岩层依次破断,为顶板亚关键层;第4～6硬岩层组成的复合关键层为顶板主关键层;计算得到的复合顶板主关键层的平均破断距为114m;当该工作面推进到108.2m时,主关键层的破断导致工作面出现异常矿压显现。工程实际应用情况表明,3种方法的有机结合,可以较准确地确定硬软交替岩层的复合顶板主关键层及其破断距,对采煤工作面的支护及矿山压力控制具有指导作用。更多还原

【Abstract】 It is very important to determine the key strata and its fracture of roof rocks to control.Taking Baijiao mine as an example,it is used three methods which are analog simulation experiment,key strata theory and numerical simulation to calculate the key strata and its fracture of hard and soft composite roofs.The results show that the first hard strata to the third hard strata break one after another,which are inferior strata in the roof.The fourth hard strata to the sixth hard strata are the combined key strata;and the average interval of roofing breaking is 114 m.Breakage of the key strata over this working face leads to strata behavior when it is progressed at 108.2 m.Meanwhile,it can determine the key strata and interval of roofing breaking of hard and soft combined roofs accurately with the three methods;and it can provide references to working face support and ground pressure control.更多还原