锦屏一级电站尾水调压室大角度上仰孔锚索施工

Construction of Anchor Cable with Large-angle Upward Hole in Tailrace Surge Tank of JinpingI Hydropower Station

摘要:

锦屏一级水电站地下厂房尾水调压室顶拱发育有f14、f18断层及煌斑岩脉，开挖后出露断层及其影响带岩体破碎，风化强烈，围岩不稳定，为了洞室稳定及施工安全，设计采用预应力锚索进行加强支护。介绍了尾水调压室大角度上仰孔锚索的施工方法。

Abstract:

f14, f18 fault and lamprophyre veins are developed in the top arch of tailrace surge tank in underground powerhouse of Jinping I hydropower station, the fault and the influence line was exposed after excavation with broken rock, strong weathering and instable surrounding rock. Pre-stressed anchor cable was designed to strengthen the support for cavity stability and construction safety. The papermainly introduced the construction method for anchor cable with large-angle upward hole in tailrace surge tank.