浅埋冲击危险性加长工作面坚硬顶板控制研究

Hard Roof Control of Extended Working Face with Shallow Depth and Rock Burst Hazard

为实现冲击危险性加长工作面坚硬顶板的有效控制,采用支架压力监测、微震监测、数值模拟和综合指数评价的方法,开展加长工作面坚硬顶板条件矿压显现规律现场实测、煤柱上方顶板处理范围的数值计算以及工作面冲击地压危险评价,并进行了现场实践。研究表明,加长工作面具有中等冲击危险,坚硬顶板活动剧烈程度、应力变化、巷道变形具有区域性,在"单面见方"等区域,坚硬顶板岩层能量集中释放,巷道变形量大,煤柱应力集中程度高,确定了不同区域坚硬顶板处理范围,开展了超前深孔预裂爆破的现场实践,使坚硬顶板问题与冲击地压危险得到有效地控制。

In order to control the hard roof of extend working face with rock burst hazard effectively, based on support pressure moni- toring, microseism monitoring, numerical simulation and composite index evaluation, filed test of rock pressure of extend working face with hard roof, numerical calculation of treatment scope in roof that overhead the pillar and evaluation of working face rock burst hazard were carried out, then practiced in filed. The research results showed that extend working face experienced the following characters, which included the middle rock burst hazard, hard roof moved violently, stress change and regional deformation of roadway and so on. In ＇ single face square＇ zone, strata energy of hard roof released concentration, roadway deformation largely, high stress concen- tration appeared in coal pillar, then the treatment scope of hard roof in different zone was confirmed, advanced presplit blasting in deep was practiced in filed, the problem of hard roof and rock burst hazard were controlled effectively.