非均质无限深透水坝基垂直防渗墙深度对渗流影响的初步研究

Preliminary study on the influence of vertical impermeable wall depth in heterogeneous infinite deep pervious dam foundation on seepage flaw

目前我国很大一部分土石坝都修建在非均质无限深透水地基上,通过对非均质无限深透水地基垂直防渗墙模型不同深度的选取,得出在非均质无限深地基土石坝的坝前水深不变的情况下,当悬挂式防渗墙的有效深度大约为6～10倍坝前水头时,坝基的渗流量明显减少的趋势变小,当悬挂式防渗墙的有效深度大约为18～20倍坝前水头时,坝基的渗流量基本趋于稳定。

The majority of earth-rockfill dams in our country are constructed on the heterogeneous infinite deep pervious foundation.According to the selection of different vertical impermeable wall depth in the heterogeneous infinite deep pervious foundation,the paper obtained the conclusion that the trend of marked reduction of seepage of a dam foundation was decreased,when the effective depth of suspended cut-off wall is about 6 to 10 times water head in front of dam,the amount of seepage in a dam foundation varies less,when the effective depth of suspended cut-off wall is about 18 to 20 times water head in front of dam,the amount of seepage tends to be stable.