TBM施工煤矿深埋硬岩巷道围岩稳定性分析及工程应用

针对首次立井煤矿TBM掘进硬岩巷道工程应用实际,进行了巷道围岩稳定性分析和施工信息化监测,并采用ABAQUS有限元数值软件研究了巷道围岩位移场、应力场和塑性区的分布规律,分析了拟定支护方案的巷道围岩稳定性。结果表明,巷道顶部的最大下沉量为33.26 mm,巷道围岩的塑性区范围为0.8~1.2 m。确定支护方式为锚网支护。在试验巷道掘进过程中,进行了围岩内部裂隙发育情况、巷道收敛变形和锚杆受力监测。巷道顶板围岩破损深度达1.5 m,两帮最大收敛量为12 mm,锚杆轴力变化范围为43.1~65.1 k N。TBM施工硬岩巷道月进尺达404 m,相比传统的钻爆法和综掘法单进提高5~10倍,工程应用表明,该工法安全高效。

Stability analysis and engineering application of TBM deep coal mine roadway and surrounding rock

Aiming at practice of the first shaft coal mine TBM, the roadway surround rock stability analysis and informative monitoring have been carried out. The distribution law of displacement, stress and plastic zone have also been studied and the stability of support design has been verified by ABAQUS finite element numerical software. Results have indicated that the maximum deformation on the roof is 33.26 mm and the range of plastic zone is 0.8~1.2 m. The supporting way has been chosen as the mode of bolt support. Fracture developing condition inside surrounding rock, roadway convergence and deformation and bolt stress have all been measured and the results have illustrated that crush zone ranger reaches up to 1.5 m over roof, the maximum horizontal convergence is 12 mm, and that bolt stress ranges from 43.1 to 65.1 kN. The maximum penetration rate of TBM is 404 m per month which is 5~10 times that of conventional drilling and blasting or roadheader, and the TBM excavation has also been proved to be safety and efficient according to engineering application.