巴家咀水库均质土坝除险加固设计方案探讨

Discussion on the rehabilitation scheme of homogeneous earth dam in Bajiazui reservoir

二十世纪六七十年代,建坝条件有限,致使黄土地区土石坝坝体内裂缝纵横,坝体、坝基渗漏,工程一直带病运行,安全隐患较大。以庆阳市巴家咀水库为例,针对湿陷性黄土地区均质土坝的裂缝成因,提出针对性的渗流解决方案。历次除险加固方案研究和本次除险加固方案比选表明:在坝体内部增加混凝土防渗墙能够有效截止坝体内渗流沿裂缝集中渗漏,彻底截断坝体及坝基的渗透通道,保证大坝渗流安全,为类似病险水库大坝的除险加固提供参考。

For dams built in the 1960s and 1970s,due to the limitation of dam construction conditions,cracks in the dam body and seepage of dam foundation occurred on the earth and rock dams locating in loess area.Taking Bajiazui reservoir in Qingyang city as an example,based on the cause reasons for cracks in earth and rock dams locating in collapsib leloess area,seepage treatment scheme is proposed.By study of previous and current rehabilitation schemes,it is obtained that adding concrete cutoff wall in dam body can not only effectively stop the inner seepage through cracks,but also cut off the seepage pas-sage in the dam body and dam foundation.In this way,the seepage safety of the dam is guaranteed,which is worthy of reference.