Numerical Analysis on Movement Rule of Overlying Strata of Shallow Coal Seam Covered with Thin Bedrock

In this paper, the RFPA(Stratum Failure Process Analysis) software is used to simulate the movement rule of overlying strata when the shallow coal seam was extracted in the Huojitu Mine of Shenfu-Dongsheng mine area. According to simulation results, along with working face being advanced, the failure processes and features, and weighting of overlying strata, were analyzed. Load-relief deformation is one of the main factors causing first separation layer of immediate roof in shallow coal seam. The main sequence of main roof抯 destruction in shallow coal seam is 憇eparation layer- breaking caving? When the shallow coal seam is extracted, after the keyload-bearing layer fully collapses, the overlaying layers will be cut and fallen, and the cracks will expand to the earth's surface.