Analysis and application of monitoring method of overburden movement and deformation in old goaf of coal mine

In order to accurately grasp the characteristics and laws of residual movement and deformation of overburden in old goaf of coal mine, on the premise of analyzing the structural characteristics of overburden in various types of goaf under different conditions, the monitoring objects and key points of overburden movement and deformation were summarized and analyzed, and the existing monitoring methods and applicability were briefly analyzed. Finally, the strip old goaf was taken as the monitoring object, the method of combining optical fiber and microseismic was used to systematically study the movement and deformation of overburden in goaf from the aspects of scheme design, data acquisition and result analysis. The research results show that the movement and deformation of overburden in the strip old goaf are at millimeter level, there is no obvious movement and damage of overburden within the monitoring period, and the overburden structure is relatively stable. The method of combining optical fiber and microseismic can effectively monitor the movement and deformation of the overburden in goaf in real time, which meets the expected monitoring purpose.