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随着地质条件良好的坝址日益减少,许多水坝已经或将要坐落在非均质无限深透水地基或深厚覆盖层地基上,为了在满足大坝安全运行的前提下尽可能减少渗流量,本文通过物理模型实验就非均质无限深透水地基上的土石坝微透水垂直防渗墙的深度对坝基渗流量的影响进行研究,得出了在非均质无限深透水地基上土石坝坝前水头不变的情况下的垂直防渗墙的有效深度。当悬挂式防渗墙深度大于10倍坝前水头后,坝基的渗流量明显减少的趋势变小,当悬挂式防渗墙的深度大约为20倍坝前水头时,坝基的渗流量基本趋于稳定。
With the decrease of dam sites with good geological conditions, many dams have been or will be located on the foundations of impermeable infinity deep foundation or deep overburden. In order to minimize the seepage flow under the premise of safe operation of the dam, The physical model experiment is carried out to study the effect of depth of impervious impervious wall on seepage of dam foundation on depth of heterogeneous infinite deep seepage foundation. The results show that in the heterogeneous infinite deep seepage foundation, The effective depth of the vertical cutoff wall in case of change. When the depth of suspended cut-off wall is more than 10 times the height of front dam, the seepage volume of dam foundation obviously decreases. When the depth of suspended cut-off wall is about 20 times of that of front dam, the seepage volume of dam foundation basically tends to stable.