采空区关键层运动对震级的影响分析

为有效预防采空区上覆关键层运动诱发工作面矿震事故的发生，根据现场实测数据并通过有限元数值模拟软件对采空区形成过程中上覆关键层破裂区范围的大小进行了模拟。得出鲍店煤矿103上04 工作面影响矿震震级大小的根源为赋存在煤层底板上方100～220 m范围内致密坚固细砂岩、中砂岩组成的关键层的破裂失稳，破裂区面积大小对应震级大小。依据103上04工作面实际震级发生情况提出针对性的解危措施：对工作面后方悬空顶板进行深孔大直径爆破技术改善岩体应力状态，释放关键层积聚过多的弹性能，能够有效防止关键层的整体运动，减小矿震事故发生的强度和频次。

Analysis of Influence of Gob's Key Strata Movement on Mine Earthquake Magnitude

In order to effectively prevent mine earthquake induced by key strata movement in the gob，and according to actual data in the field，the size of fracture region in overlying key strata of the gob is simulated with application of the finite element numerical simulation software.Accordingly，the cause for influencing the earthquake magnitude of 103up04 working face in Baodian coal mine is:fracture and instability of key strata which constituted by fine standstone and middle standstone that are hard or dense at the coal seam floor about 100~220 m，and the size of the fracture region corresponds to the earthquake magnitude.Based on the occurrence of actual magnitude in the 103up04 coal face，the preventing measures are put forward:the deep hole large diameter blasting at the behind of coal face is applied to improve the stress state of rock mass and a large amount of elastic energy accumulated in key strata is released.Thid method can effectively stop the whole movement of key strata，thus，reduce the occurrence frequency of disaster and the intensity of the mine earthquake.