Study on control technology of surrounding rock in fracture zone of return-air roadway
In order to solve the problems that may occur in the fracture zone of No.21510 return-air roadway,such as sheet wall,roof collapse and water gusher,the geological conditions of roadway excavation were analyzed.FLAC3D software was used to numerically simulate the vertical stress distribution and plastic zone development of roadway during normal excavation and fault crossing.The results showed that:compared with the normal section,the development range of the surrounding rock stress and plastic zone increased significantly during over fault tunneling,and the fault activation expanded the influence range of tunneling failure.The stability of surrounding rock was comprehensively controlled by using the method of circular grouting and"combined support with anchor net and cable beam",and the control effect was observed.During the observation period,the maximum and maximum displacement of the left and right sides of the roadway were 7.22mm and 10.68mm respectively,and the maximum displacement of the top and bottom was 21.9mm,indicating a good control effect of surrounding rock.
fault fracture zonenumerical simulationgrouting reinforcementcombined supportsurrounding rock control
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