Abstract: Abstr act:Xiaochen’ao reservoir damwas built on soft soil foundation with lowintensity and high compressibility and the dam material was incompact, so that the normal anti- seepage treatment was not suitable. Comparing kinds of methods, the thin cutoff wall was adopted and the analysis of the effect and the damslope’s stability before and after the anti- seepage treatment was carried out. The results showed that the seepage of unit dam width decreased dramatically after treatment and the anticipative anti – seepage goal was reached. The dam slope’s stability in every case met the requirements of the criterion, the maximum tension stress and compressive stress of the thin cutoff wall at different water level were less than the corresponding values in the criterion.

摘要： 小陈岙水库大坝建在强度低、压缩性高的深厚软土地基上, 因坝体材料较松散, 常规的防渗处理措施不适用。本文在多种方案比较的基础上, 采用混凝土防渗薄墙对小陈岙水库大坝进行防渗处理, 并对该方案的防渗效果及各种工况下防渗处理前后大坝坝坡稳定性进行了分析。结果表明, 采用混凝土防渗薄墙处理后的大坝单宽渗流量显著减小, 能达到预期的防渗目的; 各工况下大坝坝坡稳定性均满足规范要求; 不同水位下混凝土防渗薄墙的最大压应力小于相应的规范允许值, 最大拉应力接近规范允许值。