煤矿TBM掘进巷道围岩时效变形分析及支护参数优化研究

针对煤矿TBM掘进巷道围岩长期稳定性问题，以淮南矿区张集矿TBM掘进某瓦斯抽采巷为工程背景，开展了巷道围岩时效变形分析及支护参数优化研究。通过在TBM掘进巷道施工现场钻取砂质泥岩岩样，开展蠕变试验，获得CVISC蠕变参数|在数值模拟软件中引入CVISC蠕变模型，对不同支护工况下TBM掘进巷道围岩进行为期100d的蠕变变形模拟，获得各支护工况下巷道围岩时效变形特征和应力场及塑性分布区的演化规律|基于数值模拟结果，将优化后的锚杆+钢筋网联合支护体系应用于TBM施工巷道，并对TBM施工巷道进行围岩变形监测和锚杆轴力监测，现场实测结果表明采用的优化支护方案可有效控制围岩变形，且巷道稳定性较好。

Study on time - dependent deformation analysis and support parameter optimization of surrounding rock of TBM tunneling roadway in coal mine

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.