乌江渡坝址岩溶发育特征及其防渗方案设计

乌江渡水电站是我国成功地兴建在岩溶地区的大型水电工程．岩溶渗漏是主要的工程地质问题．本文结合工程的运行情况，对坝址区岩溶作了进一步的探讨．指出浅部岩溶与深部岩溶的发育均受到多因素的制约，但是在不同的水动力条件下形成的；通过对岩溶洞穴堆积物特征及岩溶水质的分析，指出岩溶发育阶段在垂向上具有不一致性，文章还对巨厚可溶岩层中产生渗流的有效厚度问题作了初步讨论，并指出其在防渗方案设计中的意义．

Characteristics of Karst at Wujiangdu Dam Site and Anti-leakage Design

The Wujiang Du water power station is a large project successfully built on the karst ter- rain.Leakage around the dam foundation is one of the potential engineering problems.The anti-leak- age steps have been taken on the basis of detailed investigation.The characteristics of karst at the dam- site are studied in the paper.It is pointed out that the shallow karst and deep karst have developed un- der different dynamic conditions although both influenced by many other factors.It is also pointed out that differences between the stages of karst development can be identified by analysing the characteris- tics of the cave sediment and the water quality.Finally,the effective thickness of seepage zone is diss- cussed briefly,which will be useful for the determination of the depth of curtain grouting.