锦屏二级水电站引水隧洞主要工程地质问题分析

对锦屏二级水电站引水隧洞在前期试验洞施工建设过程中遇到的工程地质问题进行分析研究。概述了锦屏二级水电站引水隧洞地应力场、岩爆及其监测预报的情况,并对隧洞高外水压力和涌突水问题进行分析研究;提出通过加强初期支护防治岩爆和“以堵为主、堵排结合”的涌突水防治措施。

Main geological problems in diversion tunnel construction at Jinping Second Class Waterpower Station

The main problems of engineering geology,including the high geo-stress,rockburst,and water gushing,which occurred during the experimental tunnel construction at the early stage of the project,were analyzed,and the results about the forecasting and monitoring of the geo-stress field and rockburst in the diversion tunnel were introduced.The measure of strengthening supports at the early stage for prevention of rockburst and the technique of water blockage combined with water drainage for water gushing control are put forward.