College of Mining Engineering, Liaoning Technical University Institute of Safety Engineering and Technology,
Liaoning Technical University College of Safety Science and Engineering, Liaoning Technical University

针对大同矿区双煤系纵深大区域煤层群开采条件,对大区域顶板岩层动态垮落形变与矿压显现特征规律进行了研究。以同忻煤矿8105工作面为工程实例,在提出了上部煤层未开采区域、遗留煤柱区域、开采垮落区域向下传递动态载荷的计算方法基础上,对动态载荷作用下岩层的垮落步距修正计算进行了研究。研究结果表明:同忻煤矿8105工作面受上部侏罗系14号煤层开采影响,主关键层垮落步距为38.23~62.32 m,8105工作面开采波及的顶板范围较广,各关键层发生同步失稳是导致强矿压显现的诱因;而主关键层垮落步距的动态变化,增加了其发生同步失稳的概率,是导致工作面频繁强矿压显现的原因。同时发现,纵深大区域煤层群开采条件下,上部煤柱对工作面强矿压显现的影响具有滞后性。

According to the mining condition of multiple coal seams with deep overburden strata and large panel in Datong Mining Area, dynamic deformation of ov erlying strata and pressure behavior were studied. Based on the mining practice of No.8105 working face of Tongxin Coal Mine, a dynamic load calculation method for t he unextracted area, coal pillar area and mining collapse area of the upper coal seams was established. The strata caving interval under the influence of dynamic load was modified. The results showed that under the influence of extraction of the upper Jurassic No.14 coal seam of Tongxin Coal Mine, the main key strata caving interval was determined from 38.23 m to62.32 m. With the wide influence range of roof strata from the working face, synchronous instability of key stratum was the cause that「 esulted in intense mining pressure occurrence. Dynamic changes of the main key stratum caving interval which increased the potential of synchronous instability were t he cause of the frequent occurrence of intense mining pressure. Moreover, under the mining condition of deep overburden strata and broad mining area, strong pressur e influence from the upper coal pllars to the working face appeared with a lag.