特殊地质条件下的帷幕灌浆涌水处理

摘要

大型水电站的基础帷幕灌浆作为工程设计的重要组成部分，其施工质量关系到工程后期的安全运行。大多数工程坝基帷幕灌浆施工时，受坝基地质条件和承受的河床水头影响，涌水压力和涌水量不同。向家坝水电站因特殊的地质条件和河床水位较高，在帷幕灌浆施工中有近85%的孔段出现涌水，且涌水压力和涌水量较大，给施工造成很多困难，国内其它工程较为少见。通过对向家坝水电站坝基帷幕灌浆各类涌水情况施工详细研究和大量试验，取得了大涌水量和特殊地质条件下帷幕灌浆成功的施工技术和施工经验，供其他类似工程参考。%The foundation of large-scale hydropower curtain grouting as an important part of the engineering design,its construction quality is related to the safe operation of the project built.The most engineering Curtain Grouting construction,the dam foundation geological conditions and withstand the riverbed head impact,the gushing pressure and water inflow different.Xiangjiaba hydropower station because of the special geological conditions and the high water level of the river bed,curtain grouting nearly 85% of the hole section gushing and gushing water pressure and water inflow and cause a lot of difficulties to the construction and other do-mestic works.By a detailed study and a large number of tests of the various types of water gushing to the Xi-angjiaba hydropower dam foundation curtain grouting.It achieved many successful construction technologys and construction experiences in large inflow and special geological conditions curtain grouting,which provides ref-erence to similar projects.