反滤层在土石坝防渗中的作用研究

Study on Effect of a Filter in Seepage Control of an Earth-rock Dam

深厚覆盖层坝基上建造土石坝的防渗措施多采用垂直防渗墙。较浅防渗墙的底部及周围、下游渗流溢出处的渗透坡降高,很容易发生渗透破坏,最终导致大坝塌陷或溃坝。设置反滤层能防止土石坝发生渗透破坏,合理的使用反滤层能很大程度降低防渗墙的深度,缩短工期,降低施工难度和工程造价,保障大坝安全稳定运行。

A vertical impervious wall is usually provided as seepage control measures for construction of an earth-rock dam on a deep and thick overburden foundation. If the seepage gradient at the bottom of a shallow impervious wall and around it or at the downstream seepage outlet is high, it is easy to cause seepage failure, eventually giving rise to dam collapse or breach. The installation of a filter can protect an earth-rock dam from seepage failure, and proper use of a filter will reduce the depth of the impervious wall, shorten the construction period, smooth construction and reduce the cost to a great extent, thus ensuring safe and stable operation of the dam.