Ⅴ类围岩隧洞交叉口段施工方法探讨

摘要

隧洞交叉口段（岔口段）的施工跨度大、结构复杂，存在安全风险，无自稳性的Ⅴ类围岩交叉口段更是安全施工的重点。本文根据四川木里河上通坝水电站引水隧洞3号施工支洞与引水主洞交叉口段的成功施工经验，分析、总结了该类工程的施工方法，保证了在Ⅴ类围岩中安全完成交叉口的施工任务。%Tunnel-crossing-section-(-fork-section-)-is-characterized-by-large-construction-span-,-complex-structure-and-security-risk.Class-V-surrounding-rock-crossing-section-without-self-stability-is-critical-for-safe-construction-.Construction-method-of-the-projects-is-analyzed-and-summarized-according-to-successful-construction-experience-of-Sichuan-Muli-River-Shangtongba-Hydropower-Station-Water-Diversion-Tunnel-No-.3-Construction-Branch-Cave-and-Water-Diversion-Main-Cave-Crossing-Section-in-the-paper-,-thereby-ensuring-safe-completion-of-construction-task-of-crossing-in-class-V-surrounding-rock-.