糯扎渡水电站尾水系统五岔口快速开挖施工技术

Rapid Excavation and Construction Technologies for Five-way Bifurcations in Tailrace System of Nuozhadu Hydropower Station

糯扎渡水电站尾水系统五岔口开挖具有地质条件复杂、洞室布置紧凑、挖空率高、预留岩柱较薄、施工干扰大、围岩稳定控制难度大等特点,通过采取精选开挖程序及方案、及时采集和分析监测数据、及时调整支护方案等施工手段,最终保证了尾水系统五岔口安全、保质、快速开挖支护成型。

The excavation of five-way bifurcations in the tailrace system of Nuozhadu Hydropower Station has characteristics of complex geological conditions, compact cavern layout, high hollow out rate, thin rock pillar, serious construction interference and difficult rock stability control. Through selecting excavation procedures and programs elaborately, collecting and analyzing monitoring data in good time and adjusting supporting procedures in no time, the excavations of five-way bifurcations are safe, high-quality and rapid.