Research on Determination Method of Gas Drainage Radius Based on Elastoplastic Softening Model

Based on the elasto-plastic softening model and the theory of gas seepage, this paper establishes the calculation model of the gas pressure and the pumping time of the coal around the mining. The COMSOL Multiphysics simulation software is used to simulate the gas pressure of the surrounding coal Distribution with time. According to the basic parameters of the 3# coal seam in the mine, the simulation results show that the effective sampling radius is 1.5m and the model is 1.6m, and the error is small within the allowable range. Based on the elastic - plastic softening model, the mining radius can provide the basis for the design of mine coal mining and drainage, improve the efficiency of gas extraction and ensure the safety of mine production. (paper)