Study on Roof Subsidence of Filling Mining in Coal Mine
Filling mining has the effect of controlling the movement of rock layers,curbing surface subsidence,and reducing geological disasters,while it can effectively use part of the solid waste,improve the mechanical environment of rock strata and reduce roof pressure.Taking a coal mine in Pingliang as the engineering background and aiming at the settlement deformation of the hard roof under the coal mine filling mining,the mechanical model of roof plate is constructed for the settlement and deformation of hard roof under the filling mining of coal mine.For the boundary condition of the four-sided solid branch of the initial pressure,the solution of different deflection expressions is selected by using the Galiagin deformation equation in the variational method;In addition,the boundary conditions of three clamped edges and one free edge are used for periodic weighting,and the Ritz deformation equation in the deformation method is used for solving.It is concluded that the roof deflection after filling is significantly reduced,the initial weighting is reduced by 38.74%,and the periodic weighting is reduced by 66.84%.At the same time,the sedimentation deformation law of the top plate under the filling and mining can be obtained,and the sinking displacement of the roof plate is significantly reduced as the elastic modulus k value of the filling body increases.
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万方数据
维普
