Prediction of surface subsidence in Gequan coal mine based on probability integral and numerical simulation

The goaf produced by underground mining will produce subsidence on the surface, which will threat to the overlying buildings. In order to study surface subsidence, probability integral method and FLAC3D numerical simulation method were adopted to simulate and predict the coal seam mining in Gequan Mine. The results showed that the subsidence decreased gradually from the center of the goaf to both ends, from the underlying strata to the surface, and the result of probability integral calculation was slightly larger than that of numerical simulation. However, in the case of fully considering complex strata and insufficient mining, numerical simulation can better reflect the real situation in the mining surface subsidence of Gequan Mine, which has good reference significance.