关键词: 断层影响, 软岩巷道, 数值模拟, 支护参数优化, 围岩稳定性控制

Abstract: Aiming at the engineering problems of surrounding rock instability and difficult support when deep high-stress soft rock roadway passes through large faults，taking the deep gas test roadway pass⁃ ing through B4F8 large normal fault project of a mine in Anhui Province as the background，the theoretical analysis，numerical simulation，scheme comparison and field industrial monitoring are comprehensively used to systematically explore the vertical stress evolution and deformation and failure law of surrounding rock in the whole process of roadway excavation near，exposing，crossing and far away from faults. The sur⁃ rounding rock control effects of four schemes of no support，single anchor net cable support，single U�shaped steel frame shed support and U-shaped steel + anchor net cable combined support are compared. The support parameters are optimized，a coordinated surrounding rock control technology suitable for the fault fracture zone is formed，and the reliability of the technology through field engineering applications is verified. The results show that the vertical stress of roadway surrounding rock shows significant stage evolu⁃ tion characteristics due to the barrier effect of fault on stress transfer. Near the fault stage，there is obvious stress concentration in the head and two sides of the hanging wall of the fault. In the stage of exposing and crossing the fault，a large range of stress reduction area is formed in front of the roadway，and the stress of surrounding rock is transferred to the roadway side of the intersection line of the upper plate of the fault. Af⁃ ter far away from the fault，there is still residual stress concentration in the deep rock mass of the fault foot⁃ wall intersection line. The comparison results of various support schemes show that the combined support of U-shaped steel+anchor mesh cable can give full play to the advantages of rigid-flexible cooperative bear⁃ ing，and the constraint effect on the deformation of the roof and floor of the roadway is significantly better than that of the single support scheme. Field monitoring shows that after the collaborative control technolo⁃ gy is adopted，the deformation of surrounding rock gradually converges and stabilizes after about 40 days of roadway support. The overall convergence rate of surrounding rock is less than 5%，and the overall sta⁃ bility of roadway is good，which can provide reference for the control project of surrounding rock crossing fault in deep high-stress soft rock roadway.

Key words: fault influence, soft rock roadway, numerical simulation, support parameter optimiza? tion, surrounding rock stability control