关键词: 深部开采, 煤岩巷道, 围岩稳定, TBM掘进, 支护技术, 数值模拟

Abstract: Abstract: Aiming at the problem of long-term stability of surrounding rock of coal mine TBM tunnelling, with TBM tunneling a gas drainage tunnel in Huainan mining area as the engineering background, time-effect deformation analysis of tunnel surrounding rock and optimization of support parameters were carried out. CVISC creep parameters are obtained by drilling sandy mudstone samples at the construction site of TBM tunnelling tunnels, carrying out creep tests, and introducing CVISC creep model into FLAC-3D numerical simulation software to carry out TBM tunnelling tunneling under different supporting conditions the surrounding rock is subjected to a 100-day creep deformation simulation, and the time-dependent deformation characteristics of the surrounding rock of the roadway under various supporting conditions and the evolution law of the stress field and the plastic distribution area are obtained. The analysis shows that the bolt + steel mesh combined supporting system can resist resistance the time-dependent deformation of the surrounding rock of the roadway is more effective; based on the results of the numerical simulation, the optimized bolt + steel mesh support system is applied to the TBM construction roadway, and the surrounding rock deformation monitoring and the bolt axial force monitoring of the TBM construction roadway are carried out. Verification based on actual measurement results. The field test results show that the optimized support scheme adopted can effectively control the surrounding rock deformation and the roadway stability is good. The research results can provide technical reference for the stability control of surrounding rock and the design of support parameters for deep soft rock TBM tunnelling.