三峡工程二期上游围堰防渗墙施工方法

Method of seepage prevention wall of construction cofferdam for the Phase Ⅱ of Three Gorge Project

三峡二期工程上游围堰防渗墙施工综合难度国内外罕见，通过引进先进设备，采用新技术、新材料、新工艺，攻克了砂卵石漏失层、陡坡段嵌岩等一系列技术难关，圆满完成了防渗墙施工任务。为二期工程施工提供了可靠保障，并将防渗墙的施工技术提高到了一个新水平。

The construction of seepage prevention wall at upper stream side of the cofferdam for Phase II of three Gorge Project is the most difficult one all over the world. The construction is completed by using new techniques, new materials, new processes. By these measure seepage through gravel stratum, rock embedded on steep slope are overcome. The completion of the seepage prevention wall ensures the Phase II work, and promote the construction technology to a new level.