Research on control effect of long anchorage and pressure relief synergistic control in deep and strong mining roadway

Abstract

In view of the serious deformation of surrounding rock of deep strong mining roadway, this paper takes 4203 return airway in Jianxin Mine as the engineering background, and uses FLAC3D numerical simulation software to simulate the stress distribution law of roadway and the deformation law of surrounding rock of roadway after three schemes of “short bolt + long anchor cable”, “long bolt + short anchor cable” and “long bolt + short anchor cable + pressure relief” are adopted when the roadway is disturbed by tunneling and secondary mining. The results show that increasing the bolt length can effectively reduce the roof deformation, and pressure relief can effectively improve the stress environment of roadway surrounding rock. The experimental section was set up in 4203 return airway, which proved that the collaborative control of long anchorage and pressure relief had obvious effect on the control of roadway deformation and the improvement of stress environment.

Keywords

• strong mining
• long anchorage
• pressure relief
• stress distribution
• numerical simulation
• surrounding rock control