大黑汀混凝土坝坝基溢出物成因分析

ANALYSIS OF THE CAUSE OF EXUDATION FROM DAHEITING DAM FOUNDATION

在现场调查研究的基础上，分析论证坝基溢出物的主要来源（坝基断层、基岩裂隙和防渗帷幕）。矿物在坝基渗压水作用下溶解、侵蚀与迁移，在氧化还原条件下转化形成溢出物。指出了坝基溢出物逐年增多，已使大黑汀坝基防渗帷幕部分失效。

Bases on field investigation, this paper demonstrates that exudation is mainly from the fault of the dam base, crack, in the base rock and anti seepage curtain. The mineral is dissolved, eroded and displaced by seepage water from the dam base, finally becomes exudation under oxidation and reduction. This paper also points out that the exudation from the dam base increases with time, and it has disabled part of the anti seepage curtain of the Daheiting dam base. So it is necessary to strengthen the anti seepage curtain.