缅甸伊江上游某水电站坝基渗控效果研究

Seepage Control Effectiveness for Gravity Dam Foundation in the Upstream of Irrawaddy River in Burma

对于有断层带存在的坝基,其防渗帷幕和密集排水孔幕的效果是水利水电工程安全的关键问题之一。针对伊江上游某重力坝基础,利用三维渗流场有限元精细求解技术,建立了伊江上游某坝基渗流场计算模型,分析了断层带范围内防渗帷幕失效和坝基排水孔不同间距条件下的渗控效果。成果表明:断层带范围内防渗帷幕失效,坝基渗流量增大,但扬压力折减系数仍满足设计要求;排水孔幕间距扩大1倍,渗控效果并无明显变化。成果可为类似坝基渗控设计提供参考依据。

The effect of impervious curtain and intensive drainage holes in the dam foundation with fault is a key problem in hydro-electric engineering. By employing three-dimensional finite element, a seepage model is proposed with a gravity dam foundation in the upstream of Irrawaddy River as case study. The seepage control effect in the presence of failed impervious curtain or different spacings of drainage holes is analyzed. Results indicated that when the impervious curtain in the fault failed, the discharge increased but the reduction coefficient of uplift pressure met the design requirement; and when the spacing between drainage holes doubles, the seepage control effect did not change significantly. The research result could be a reference for similar designs of seepage control for dam foundation.