糯扎渡水电站主厂房运输洞塌方处理  

Collapse treatment for transportation tunnel of main powerhouse of Nuozhadu Hydropower Station

作　　者：李弦 张玉成 尹晓慧 

机构地区：[1]长江勘测规划设计有限责任公司工程建设与监理公司,湖北武汉430010

出　　处：《人民长江》2012年第4期83-85,共3页Yangtze River

摘　　要：糯扎渡水电站主厂房运输洞V类围岩洞段开挖后发生塌方,塌方体填满整个洞室,为了防止塌方的进一步扩大或再次坍塌,确保塌方处理安全,首先对塌穴和影响段进行了加固处理,然后对塌方进行处理,并对塌方段进行开挖。采用预先灌浆加固、超前支护和预留核心土开挖等措施,顺利穿越塌方体。处理后的监测结果显示,支护后位移变化较小,且呈收敛状态。Collapse happened after excavation of the transportation tunnel （ surrounded by type V rock） of main powerhouse of Nuozhadu Hydropower Station, and the whole cavern was filled with collapsed rocks. In order to prevent the collapse from expanding or happening again, the collapse site and its related sections were reinforced, and the body was treated and the collapse section was excavated. The measures such as pre - grouting reinforcement, advanced support and excavation with core - soil reserved are adopted, and the collapse body is tunneled through successfully. The monitoring results after treatment show that the displacement variation is small and in a convergent state.

关 键 词：塌方处理 Ⅴ类围岩 超前管棚 开挖支护 灌浆 糯扎渡水电站 

分 类 号：TV543[水利工程—水利水电工程]