Study on the deformation characteristics and support of peripheral rock over faults during the excavation of back-mining roadway

Aiming at the problem that the faults in the roadway during the excavation of the back-mining roadway lead to the slow construction speed and the roadway surrounding rock is not easy to be maintained, which affects the safety and rate of development, etc., the depth of damage of the faults to the surrounding rock of the roadway and the range of influence of the faults are analysed through the theoretical analysis and numerical simulation, and the result shows that, under the influence of the faults, the maximum depth of the plastic damage zone of the surrounding rock is 2.56 m, and the maximum depth of the surrounding rock is 2.56 m.When the tunnel passes through the low-drop fault, high-drop fault and combined fault, the range of reinforced support should be more than 10 m, 15 m and 13 m respectively, and the reinforced support scheme within the influence of the fault is proposed, and through the simulation and comparative analysis and on-site monitoring, the reliability of the support scheme is verified to guarantee the stability of the tunnel peripheral rock.