Stability Analysis and Control Technology of Close-Distance Lower Coal Seam Roadway for Mining Excavation
In order to study the stability of close-distance lower coal seam roadway for mining excavation,taking the mining excavation problem of 13 lower 06 roadway in the mining process of 13 upper 06 working face in No.31 mining area of Xin'an Coal Mine as the research object,the stability of close-distance lower coal seam roadway for mining excavation was studied by combining theoretical analysis and numerical simulation.Through numerical simulation on the influence range of the abutment pressure of the stope,the depth of the floor failure,the deformation of the lower coal seam mining roadway,the range of the plastic zone,the change of the force of the anchor rods and cables,as well as the mutual influence degree of the mining between the upper and lower coal seams was studied,so as to provide a basis for reasonably determining the safe distance between the upper coal seam mining and the lower coal seam roadway excavation.The results of the study show that the influence range of the mining dynamic pressure of the upper coal seam working face on the roadway excavation of the lower coal seam working face is from+30 m to-30 m.It is recommended that when the pushing face of the goaf is 30 m away from the head of the material roadway,the lower coal return roadway stops excavating,and when the pushing face of the goaf is-30 m away from the head of the material roadway,the lower coal return roadway resumes excavating.During the cessation of excavating,reinforcement should be carried out by means of monolithic pillars.
Close-distance coal seamRoadway for mining excavationInfluence of dynamic pressureNumerical simulation
万方数据
维普
