Research on overburden failure and land subsidence characteristics of double coal seam mining in Yushenfu Mining Area

In order to study the overburden failure characteristics and surface subsidence law of shallow buried coal seam under the condition of double coal seam mining, based on the geological conditions of typical shallow buried coal seam in Yushenfu Mining Area, the numerical simulation method was used to analyze the overburden failure and surface subsidence characteristics under six different working conditions, and the physical similarity simulation experiment was used to verify. The results show that the failure mode of shallow buried coal seam is full-thickness cutting, and the mining-induced failure in the water-resisting layer in the retained coal pillar mining presents the “mud cover effect”. When the coal pillar is not retained, the two sides of the goaf form the development zone of separated cracks, and the cracks develop about 45° above the two sides of the goaf. The surface subsidence is stepped when the coal seam is mined. With the advance of the working face, the surface subsidence center moves forward