巴塘水电站特大断面泄洪洞出口塌方处理施工技术  

Construction Technology of Collapse Treatment at the outlet of Spillway Tunnel with Super-large Section of Batang Hydropower Station

作　　者：刘潇瑜 梁燕平 荆卢峰 LIU Xiaoyu;LIANG Yanping;XIN Lufeng(Sinohydro Bureau 5 Co.,Ltd.,Chengdu Sichuan 610066)

机构地区：[1]中国水利水电第五工程局有限公司,四川成都610066

出　　处：《四川水力发电》2023年第2期121-124,共4页Sichuan Hydropower

摘　　要：巴塘水电站泄洪放空洞出口F46/F21断层引发了边坡坍塌现象,坍塌高度约40 m,最终坍塌到泄洪放空洞洞内,导致已经贯通的第一层洞室被坍塌石渣覆盖。为快速安全地穿越塌方段,根据现场地质勘察情况,采取“小断面+短进尺+强支护”的塌方处理原则和“洞外反压+超前管棚+钢支撑”的综合治理措施,处理后,泄洪放空洞出口渐变段的最大收敛沉降变形约为6 mm。实践证明,表面塌方处理技术合理安全,相关工程处理经验可供类似特大断面隧洞塌方处理时借鉴。The F46/F21 fault at the outlet of spillway tunnel of Batang Hydropower Station caused the slope collapse with a height of about 40 m,and finally collapsed into the spillway tunnel,causing the first floor of the tunnel that had been penetrated being covered by collapsed rock slag.In order to quickly and safely cross the collapse section,according to the on-site geological survey,the collapse treatment principle of"small section+short footage+strong support"and the comprehensive treatment measures of"external back pressure+advanced pipe shed+steel support"were adopted to deal with the collapse.After that,the maximum convergence settlement deformation of the transition section at the outlet of the spillway tunnel is about 6mm,and the surface collapse treatment technology is reasonable and safe.The treatment experience can provide reference for the collapse treatment of similar large section tunnels.

关 键 词：特大断面隧洞 塌方 处理技术 治理效果 

分 类 号：TM622[电气工程—电力系统及自动化] U449.86[建筑科学—桥梁与隧道工程] TU943.4[交通运输工程—道路与铁道工程]