Mine Pressure Behaviors of Shallow-buried and Close Distance Coal Seams Passing Through Overburden Goaf and Coal Pillars

Based on the measured results of ground pressure at 31201 working face of Shigetai Mine in Shendong Mining Area, mine pressure behavior laws of mining under overlying residual coal pillar and overlying goaf are summarized. Measured results show that mine pressure behavior is severe when the mining is under overlying residual coal pillar; rib spalling at working face and large-scale roof caving directly leads to crushing events in nearby area of coal pillar. When mining is under longwall goaf, working face first weighting step is 48.6 m, and periodic weighting step is 9.68 m. In order to further study mine pressure laws of working face in various stages, according to the rock physical parameters of 31201 working face, we build plane physical model, use model support to measure mine pressure laws in different mining stages; the simulation experiment results show that the experimental measured results were consistent with the measured results.