水流对土石坝心墙裂缝在反滤层保护下的冲蚀特性

Erodibility of flow for core crack of earth-rock dam under filter protection

为了解水流冲刷作用下反滤层对土石坝心墙裂缝发展保护作用的特点和机理 ,以黑河土石坝心墙裂缝冲刷试验为例 ,分别采用常水头和变水头两种方法 ,探讨了土石坝心墙裂缝在水流冲刷过程中的特点。结果表明 ,宽度不大的裂缝在合适的反滤层保护下 ,能防止心墙土体被水流冲刷。

In order to understand the characteristics and mechanism of flow washout for the crevice of core wall in earth rock dam,according to the exemple of crack washout test for the core of Heihe Dam,constant water level washout test and changing water level washout test are adopted differently,the process of test and the character of the flow washout for the core crack are gone into particulars.It is conclued that the filter layer can protect the core wall of earth rock dam from flow erosion.