金平水电站深覆盖层基础处理及渗流稳定分析

详细叙述了防渗墙+防渗帷幕完整防渗体系,并选择9个典型大坝断面,考虑4个边界水头,对各种工况条件下大坝的渗流安全性进行评估。计算结果表明,采用防渗墙+防渗帷幕方案,可有效控制大坝渗漏(单宽渗流量小于14m3/d),防止坝基渗透变形,并能有效降低下游坝坡浸润线,坝体和坝基的抗渗安全系数均满足要求。

Foundation Treatment and Seepage Stability Analysis of Jinping Hydropower Station with a Deep Overlay

To ensure the penetration stability of the dam foundation and ject, a variety of dam foundation seepage control schemes were compared economic rationality of the seepage control pro- during the design stage. , An impermeable wall plus impervious curtain program was selected in the end. In this paper, the full seepage control system of impermeable wails plus impervious curtains was illustrated in details. Nine typical sections of the dam were selected and analyzed with consideration of four boundary conditions to assess the seepage stability of the dam under various working conditions. Calculation results show that the impermeable wall plus impervious curtain program could control the dam seepage effec- tively with the seepage flow per unit width is less than 14 m^3/d, and could prevent the dam foundation from seepage de- formation. The downstream slope seepage line is also effectively lowered down. With the program, both the seepage safe- ty factors of the dam body and foundation can meet the requirements.