Abstract:In the process of thick coal seam mining, section coal pillars are usually retained for roadway protection, which brings problems such as waste of coal resources and difficulty in roadway maintenance. In order to solve these problems, this paper proposes a method of non-pillar mining of prefabricated filling roadway side in fully mechanized top coal caving face. The numerical simulation method is used to establish a non-pillar mining model of prefabricated filling roadway side in fully mechanized top coal caving face. The stress distribution, displacement change and plastic zone distribution law of surrounding rock in the process of roadway excavation are studied. The results show that the excavation of the mining roadway will cause the stress redistribution of the surrounding rock, which will lead to the increase of the stress of the filling roadway side and the solid coal side; the prefabricated filling body in the roadway has a large supporting strength and anti-deformation ability, and its deformation is less than that of the solid coal side. The application of non-pillar mining method of prefabricated filling roadway in fully mechanized caving roadway can effectively improve the recovery rate of working face and reduce the deformation of roadway surrounding rock, which is of great significance to the study of non-pillar mining and roadway surrounding rock stability.
