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本文以玉希莫勒盖隧道过断层带段为工程依托,通过仿真分析按照初始、开挖、涌水、处治等工序分阶段研究地下水渗流场变化规律及YK723+911涌水坍方原因,研究表明隧道开挖改变地下水渗流分布向洞口聚集,加之大气降水及绿泥石片岩遇水急剧软化的特性,导致涌水塌方。结合理论分析从注浆加固、封闭塌方体、提升支护参数等方面提出具体处治措施供同类工程借鉴,现场监控量测结果表明注浆措施能够将大部分地下水封堵在隧道开挖影响范围之外,保障了隧道建设及运营期间的安全。
In this paper, the Yuxi-Maili tunnel cross-fault zone is relied on. Through the simulation analysis, the variation law of groundwater seepage field and the reason of YK723 + 911 gushing collapse are studied in stages according to the procedures of initial excavation, water gushing, treatment and so on. Digging to change the distribution of groundwater seepage to the hole aggregation, combined with atmospheric precipitation and chlorite schist suddenly softened water characteristics, leading to water collapse. Combining with the theoretical analysis, concrete treatment measures are put forward from the aspects of grouting reinforcement, closed landslide body and raising support parameters, etc. The monitoring results of on-site monitoring show that the grouting measures can seal most of the groundwater in the tunnel excavation range In addition, the safety during the construction and operation of the tunnel is guaranteed.