Study on Deformation Failure and Control Strategy for Deep Large Span Soft Rock Roadway

Abstract

As the depth increasing of domestic and foreign coal mines, the ground press increasing gradually and the mining conditions are getting worse and worse. By the impact of tunneling and mining face, the roadway deformation is serious and the roadway floor heave frequently, the regular service of the roadway is affected severely. The engineering geological conditions and the mechanical properties of the wall rock of the Ninth Coal Mine of Hebi Coal group were analyzed, and the in situ ground press and strain of the roadway was measured, the floor heave failure mechanism of the deep large span roadway was studied, and the new coupling support design—bolt-mesh-cable + anchor in floor + high protrusion steel band—was put forward, as well as the optimization for the main section of the design. Both numerical simulation and in-situ monitoring proved demonstrates that the design can make the bolt-mesh-cable and steel band and anchor in floor coupling support highly active, be able to control the asymmetrical deformation of roadway effectively, and provide fundamental basis for safe and efficient production for other coal mines.