关键词: 沿空巷道　切顶卸压　变形控制　小煤柱　围岩稳定性

Abstract: With the increase of coal mining intensity,the problem of tight mining succession caused by the imbalance of mining proportion has become increasingly prominent.Frequent mining activities have caused serious damage to the surround ing rock of the roadway.As a pre mining excavation roadway,the stability of small coal pillar goaf roadway directly affects the safety of underground operations and the control effect of surrounding rock.In order to improve the safety and stability of under ground mining operations,a deformation control technology for surrounding rock of small coal pillar goaf based on top cutting and pressure relief is proposed.By analyzing the deformation and failure characteristics of the surrounding rock along the small coal pillar goaf,the roof of the small coal pillar goaf is controlled.Research has shown that the deformation control technology of small coal pillars along the empty roadway using top cutting and pressure relief has shown good performance.When there is no top cutting and pressure relief,the maximum stress on the roof is 25.7 MPa.The stress on the roof after top cutting and pres sure relief is 9.6 MPa,and the roof stress is reduced by 62.6%;When the maximum stress of the coal pillar without top cutting and pressure relief is 19.9 MPa,the stress of the coal pillar with top cutting and pressure relief is 4.4 MPa,and the stress of the coal pillar is reduced by 77.9%.The research reflects that the proposed top cutting and pressure relief control method can effectively reduce the stress on the roof and coal pillar support,thereby minimizing the damage range of the surrounding rock, which is of great significance for ensuring the safety of small coal pillar goaf operations.

Key words: along the empty roadway,top cutting and pressure relief,deformation control,small coal pillars,rock stability