The goaf retaining roadway has undergone multiple mining stress impacts,and the surrounding rock of the roadway has been severely deformed and damaged.The roof cutting and pressure relief technology can cut off the connection between the direct roof of the roadway and the overlying rock layer,improve the surrounding rock conditions of the roadway,and enhance the stability of the roadway.In order to explore the key technical parameters of roof cutting pressure relief,this paper used numerical simulation methods to study the stress distribution and displacement changes of roadway surrounding rock under different roof cutting heights and angles.It is determined that the roof cutting height of 263up31 working face in Chaili Coal Mine is 6 m,and the roof cutting angle is 5°.After on-site practice verification,the control plan for roadway surrounding rock in 263up31 working face has achieved the expected effect,the research can provide a certain reference for the control of roadway surrounding rock under similar conditions.
关键词
煤矿/高地应力/沿空留巷/切顶卸压/数值模拟
Key words
coal min/high stress/gob-side entry retaining/roof cutting and pressure relief/numerical simulation
维普
万方数据