粘土斜墙堆石坝的渗流反演分析

Inverse analysis on the seepage of rock-fill dam with inclined clay-core wall

小南海水库大坝为粘土斜墙堆石坝,上游为重粉质壤土填筑的厚粘土斜墙,粘土斜墙后紧接堆石坝体,粘土斜墙与堆石体之间设反滤层。坝基以闪长岩为主,原河床位于右坝段,河床段基岩覆盖层厚8~12m,其中强透水性砂卵石层厚3~5m。坝基防渗工程仅为三道质量不高的截水槽。通过对小南海水库大坝进行渗流分析,找出大坝渗流安全方面存在的问题,为水库下一轮的除险加固提供支持和决策依据。

Xiaonanhai reservoir dam is a rock-fill dam with inclined clay-core wall. The upstream thick inclined clay-core wall was filled with heavy silt loam. The embankment was behind the wall and a filter layer was set between. Diorite filled a large part of dam foundation and the original river bed located on the right. The thickness of dam foundation overburden was 8~12 m, of which the thickness of the strong permeable sand pebble layer was 3-5 m. Seepage prevention works at dam foundation were only 3 cutoff trenches of poor quality. The paper analysed the seepage of Xiaouanhai reservoir dam and pointed out the existing problems, worthy reference for rehabilitation and decision making.