岳城水库大副坝防渗墙设计

Design of diaphragm wall for the Yuecheng Reservoir Dafuba auxiliary dam

岳城水库大副坝坝基为透水的第三系砂 ,由于历史的原因 ,上游未做防渗处理。当库水位超过 140 0m ,下游排水管即出现涌沙现象 ,虽经多次治理 ,仍未彻底解决。本次在上游坝坡建造了一道全封闭的塑性混凝土防渗墙 ,取得了预期的效果。本文详细分析了副坝涌沙的原因 ,介绍了塑性混凝土防渗墙的布置、墙体材料设计指标和墙顶处理工程措施 。

Foundation of the Yuecheng Reservoir Dafuba auxiliary dam is composed of the tertiary sand,and no impervious treatment was made to the upstream face due to some historical reasons.When the reservoir water level exceeds 140 0 m,the boiling of sands happens within the upstream drainage pipes.Such a problem has not yet been solved satisfactorily though several treatment measures were made.By constructing a totallyenclosed elastic concrete diaphragm wall this time,the expected results have been achieved.The reasons for boiling of sands in the auxiliary dam is analyzed in detail,and the arrangement of the elastic concrete diaphragm wall and the engineering measures such as the design indexes of the wall material and the crest treatment of the diaphragm wall,etc.,are described in this paper for reference.