复合顶板下冲击地压煤层综放工作面微震特征分析

以小庄煤矿40204综放工作面为例，对复合顶板下冲击地压煤层综放工作面微震事件分布及活动特征进行分析，重点分析了微震事件的周期性规律、微震活动与采动应力的关系及其沿工作面倾向的分布规律。通过分析发现，复合顶板条件下40204采空区对工作面超前应力集中影响较小，但相邻采空区对邻空巷道的影响较大。当形成大面积采空区时，采空区上方的高位顶板会形成联动效应，增大了复合顶板对工作面冲击危险性的影响。根据微震特征分析结果，制订了复合顶板下防冲卸压措施。40204工作面已回采结束，未发生冲击显现，表明采取的卸压解危措施较为合理，微震监测结果符合客观实际。

Analysis of microseismic characteristics in fully mechanized working face in rockburst coal seam of composite roof

Taking the 40204 fully mechanized working face of Xiaozhuang Coal Mine as an example,the distribution and activity characteristics of microseismic events in the fully mechanized working face in rockburst coal seam of composite roof were analyzed.The periodic regularity of microseismic events,the relationship between microseismic activities and mining stress,and the distribution regularity along working face tendency were emphatically analyzed.Through analysis,it is found that 40204 goaf of composite roof has less influence on leading stress concentration in the working face,while the adjacent goaf has greater influence on roadway.When a large area of goaf is formed,the high roof above the goaf will form a linkage effect,which increases the impact of the composite roof in the working face.According to the analysis results of microseismic characteristics,the measures to prevent and relieve pressure of composite roof are formulated.The 40204 working face has been stoped and no impact has occurred,which indicates that the measures taken to relieve the pressure are reasonable,and the results of microseismic monitoring are in line with the field reality.