深埋隧洞施工期围岩变形与应力分析及稳定性评价

摘要

By embedded monitoring instruments, monitoring of tunnel section excavated by TBM meth-od and drilling and blasting method was carried out. By analysis of the monitoring results, insight into the deformation and stress adjustment of the brittle marble during excavation was got. As well, the relax-ation depth and failure characteristics caused by TBM method and drilling and blasting method to differ-ent rock type were obtained. These were of great meaning to understand the physical characteristics of the deep-buried brittle marble and response pattern of the surrounding rock in excavation.%通过现场原位多种监测仪器的预埋对大直径TBM法和钻爆法开挖的洞段进行监测，综合分析围岩变形及应力监测成果，深入剖析深埋脆性大理岩在开挖过程中围岩变形及应力调整的特征，把握TBM法和钻爆法两种不同施工方法在不同围岩类别条件下引起的围岩松弛深度及围岩破坏特性，对进一步了解深埋脆性大理岩的物理特性和洞室开挖围岩响应规律具有重要意义。