Research on the movement law of overlying strata during mechanized paste filling mining in coal mine

In order to promote safe, efficient and green mining of coal resources and sustainable energy development, and to improve the production efficiency of coal mines and the support effect of overlying strata. By combining theoretical analysis, numerical simulation, and on-site practice, the movement law of the overlying strata in the mechanized mining of paste filling in 12403 working face is studied. The main influencing factors on the subsidence of the top plate of the filling working face have been determined to be the rock parameters of the top plate, the filling step distance of the working face, the strength of the filling material, the filling rate, and other related parameters. It studies the characteristics of overlying rock movement and found that when the filling rate of the paste in the working face exceeds 80%, the top plate of the filling working face remains intact, with minor bending and sinking. A filling material with a strength of 3.5 MPa, a filling rate of 80%, and a combination of three mining and one filling are proposed. After filling with paste, the stability period of the overlying rock layer is significantly shortened, and the rock movement is relatively gentle, with a maximum surface subsidence displacement of 210.22 mm. The research results indicate that the filling and mining of the working face paste significantly weakens the movement law of the overlying rock layer, and effectively controls the stability of the surrounding rock of the working face. To provide theoretical basis and technical guidance for achieving safe, efficient, and green mining of deep coal resources.