Research on microseismic monitoring and movement law of overlying strata in near horizontal thick coal seam

In order to study the influence of mining on the movement law of overlying strata in underground coal mine, taking the near horizontal thick coal seam 31313 working face of Chahasu Coal Mine as the engineering background, the stratum movement law and coal rock rupture range under the influence of mining have been studied from the aspects of the overall distribution range of microseismic events, the distribution of varied heights in the stratum, and the relationship between microseismic frequency and periodic weighting, numerical simulation software 3DEC was used to verify the results.The results show that the fracture events at different altitude have different periodicity, the high-level period is composed of several mid-level periods; the direct roof is located within 18 m above the stope, and the basic roof is located within from 18 m to 60 m; the periodical weighting step obtained by the analysis of microseismic event is twice the actual periodical weighting step; the movement of overlying rock stratum in stope can be truly and effectively inverted with the help of microseismic monitoring technology.The research results can provide a reference for microseismic technology to identify the law of rock strata movement.