安砂水电站坝基地下水析出物的研究

A STUDY OF MATERIAL SEPARTING FROM GROUND WATER AT DAM FOUNDATION OF ANSHA HYDROPOWER STATION

从我国首次大坝安全定期检查中得知，在已建成并运行多年的许多大坝中，其坝内廊道或基础廊道中的排水孔、排水沟，均不同程度地发现有地下水析出物存在，有的析出量特别多，种类也比较复杂，曾引起电厂及专家们的重视。本文从研究安砂水电站大坝工程地质、水文地质环境入手，采取多种分析测试方法，研究环境水、坝基岩体和析出物的矿物、化学成分、物化特性及颗粒组成等，揭示坝基地下水析出物的形成机理，并评价析出物对大坝安全的影响。

It is kowen in first regular examination of dam safity in China that there exists material separating from ground water to different extent in drainage holes and draingage galleries at dam foundations or foundation corridors of many constructed and operating dams. Large amount and yaring composition of the material found in some dams have attracted sttension from experts and the relevant persongs of electropower stations. This paper provides a result of study of mineralogical and chemical conposition, physico chemical properties, and granulometric composition of surrounding water, rockmass on dam foundation and the material operatingfrom ground water by measurement and determination methods from engineering geological and hydrogical aspects,revearls the formation mechanism of the material separating from the ground water,and evaluates the effect of the material on dam safity.