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黄沙坑水库引水隧洞不良地质段主要分布在主洞出口段,围岩类别以Ⅳ、Ⅴ类围岩为主。施工过程采用“短进尺、弱爆破、强支护、勤观测”等施工措施总方案,结合超前小导管管棚注浆、钢拱架支撑、钢筋网、混凝土喷锚闭合成环等强支护技术措施,有效解决了隧洞塌方、溶洞涌泥涌水等问题,确保了工程施工安全与质量,顺利通过了不良地质段。该文对此进行总结,供隧洞开挖工程遭遇类似不良地质参考。
The poor geological section of the diversion tunnel of Huangsongkeng reservoir is mainly located in the outlet section of the main tunnel, and the surrounding rock types are dominated by Ⅳ and Ⅴ type of surrounding rock. Construction process using “short footage, weak blasting, strong support, ground observation ” and other construction measures of the total program, combined with advanced small duct pipe shed grouting, steel arch support, steel mesh, Support technical measures to effectively solve the tunnel collapse, cave Chung flooding and other issues to ensure the construction safety and quality of construction, successfully passed the adverse geological segment. This article summarizes this for tunnel excavation engineering encountering similar unfavorable geological reference.