Mechanism And Engineering Application Research Of Dynamic Reinforcement Support In Deep Roadway

In order to solve the difficult problem of controlling the surrounding rock of deep roadway, it is necessary to study the evolution law of the stress field of surrounding rock in deep roadway. In this paper, the space time evolution law of stress field of surrounding rock of deep roadway is analyzed theoretically and numerically based on the core and laboratory tests, The mechanism of dynamic reinforcement support of roadway is obtained, and the dynamic reinforcement support nursing effect was verified by the engineering practice.Theoretical analysis results show that the peak value of the surrounding rock is transferred to the surrounding rock at the time of the first support. Once peak strain exceeds the rock yield strain of rock will flow, The broken rock mass ranges from the deep to the surrounding rock. A case study of Xinhu coal mine, The calculation results show that the initial transition velocity of surrounding rock is relatively fast, in the 60th day the inflection point appears,and the peak position in 6.96m, then evolution slowed, Eventually,In the first 124.8 days of rock peak basically stopped in the 7.21m position. For security, the time of dynamic reinforcement support is determined to be 60 days after the excavation of the roadway. Further research shows that the original rock stress, the radius of the tunnel, the internal friction angle, the rock lithology and so on will have an impact on the timing of the support. Reinforced support method for anchor wire mesh cable injection.Use FLAC3D numerical simulation software to simulate the excavation of tunnel stress and displacement of surrounding rock mass in the different time nodes, the results also demonstrate the correctness of the theoretical analysis results; in the 60 days of the roadway of anchor cable, grouting and shotcrete, played a very good control effect.Comprehensive theoretical analysis and numerical simulation results, in deep roadway of engineering application, the field supporting effect observation shows, roadway surrounding rock obtained stable control, dynamic reinforcement support support successfully applied to engineering practice.