Movement law and stability control of overlying rock strata in strip filling mining of fully mechanized mining faces
Aiming at the problem of overlying rock strata stability in the pasted strip filling mining of longwall fully mechanized mining face,taking the strip filling mining of Guojiawan Coal Mine of Guoneng Yulin Energy as the engineering background,using the finite element engineering simulation software ABAQUS to carry out the numerical simulation,the movement law of overlying rock strata when the longwall fully mechanized mining face is not filled and the influence and stability of the overlying rock strata when the strip filling is carried out are studied.The research results show that,with the continuous advance of the working face,stress concentration occurs in the middle of the coal wall in front of the working face and at the coal pillars on both sides of the working face;the overlying rock keeps collapsing,and the initial pressure comes when the mining reaches 60 m,the working face periodic pressure step is 30 m,the stress peak reaches 32.02 MPa,and the roof displacement peak reaches 3.42 m.After using strip filling mining,the filling strip can obviously alleviate the deformation and stress concentration of the roof.With the decrease of strip spacing,that is,with the increase of filling rate,the strip filling body is more beneficial to the stability control of overlying rock strata.When the strip spacing is 20 m,and the filling rate is 33%,the displacement and stress of the coal pillar in the middle and both sides of the roof are effectively controlled and basically tend to be stable.Compared with the unfilled condition,the peak stress of the coal pillar on both sides is reduced from 32.02 MPa to 3.79 MPa,and the peak displacement of the roof is reduced from 3.42 m to 0.09 m.
longwall fully mechanized mining facestrip fillingmovement law of overlying rock stratafinite element software ABAQUS
万方数据
维普
