Research on Optimization Mechanism of Roadway Stability With Large Cross Section and Shallow Buried

Aiming at the problem of stability control in roadway with large cross section, the auxiliary shaft which is shallow buried with large cross section in Zhuanlongwan Coal Mine in Inner Mongolia is taken as the background. Through analyzing the necessity of optimizing the former supporting scheme of U-shaped steel and armoured concrete, the FLAC^3D finite difference software is adopted to discuss the surrounding rock deformation and stress distribution in three different supporting schemes on the base of theoretical analysis and loose circle test. The result indicates that the supporting scheme of cable anchor not only increases the rigidity and overall performance of the surrounding rock, but also avoids the damages from shear and break, besides, the anchor at the basic angle controls the deformation amount of the floor.