锦屏二级水电站西端引水隧洞主要施工技术

Main technologies for construction of diversion tunnels of Jinping Hydropower Station II

锦屏二级水电站4条引水隧洞单洞长度约16．67km，开挖洞径13．0～13．8m，埋深1500～2000m，水文地质条件复杂，具有长洞线、高埋深、大洞径的特点。针对具体施工条件制定并实施了超前地质预报、岩爆防治、突涌水处理等技术措施，并引进了世界先进设备，自主研发水平曲面滑模，较好地解决了高埋深、高地应力、大流量突涌水、强岩爆等问题，可供类似工程借鉴。

The four diversion tunnels of Jinping Hydropower Station II are under a complicated hydro-geological condition with the characteristics of long tunnel axis of about 16.67 km, deep buried depth of about 1 500 -2 000 m and large excavation diameter of about 13.0 - 13.8 m. In accordance with the specific construction＂ condition therein, the technical measures such as geological prediction, control and prevention of rock burst, sudden water inrush, etc. are made, and then all the problems of deep buried depth, high geo-stress, sudden water inrush with large flow rate, strong rockburst, etc. are better solved with both the introduce world-advanced equipments and the self-developed horizontal curved face slip-form; which can provide a reference for the similar project.