两河口心墙堆石坝渗流特性及其控制方案

Seepage Behavior and Its Control Scheme of Lianghekou Core-wall Rockfill Dam

建立了两河口工程坝址区的三维渗流有限元模型,并计算分析了坝体及其坝基的三维稳定渗流场特性,获得了坝体和坝基的位势分布、坝体各分区的渗透坡降及渗透流量等。分析了坝基防渗帷幕和左右岸防渗帷幕深度和长度变化及防渗帷幕和坝基岩体渗透参数对渗流场的影响。结果表明,坝体、坝基及左右岸坝肩的防渗措施均可满足要求。建议考虑坝基防渗帷幕仅截断3 Lu线以上岩体的防渗方案,并将左岸防渗帷幕的延伸长度减少50 m。

The 3-D seepage finite element model of dam site for Lianghekou water project is set up, and the behavior of stable seepage field of dam body and its foundation is calculated and analyzed for water storage period. The equipotential distribution of the seepage field and seepage gradient of dam body and seepage discharge etc are obtained. The effect of the depth and length of impervious curtain of dam foundation and the dam abutment on seepage field is analyzed, and the seepage parameter of impervious curtain and rock mass of dam foundation on seepage field is analyzed too. It is shown that the seepage control scheme of the dam can satisfied with the design code. In addition the proposal that the impervious curtain cut off the bedrock with seepage coefficient large than 3 Lu only is suggested. And for the impervious curtain of left bank the length may be reduced by 50 m.