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渗流问题是影响土石坝稳定安全的主要因素之一。由于目前良好的坝址在国内外的数量逐日减少,将要建设的许多大坝工程很可能设在非均质无限深透水地基上,因此,对于建在非均质无限深透水地基上的土石坝的渗流研究具有更加实际的意义。为了在满足大坝安全运行的前提下尽可能地减少渗流量,本文采用ABAQUS有限元软件对不同深度的微透水防渗墙进行渗流分析。当防渗墙深度达到10倍的坝前水深时,渗流量减小的效果已不是很明显;当防渗墙深度为2倍的坝前水深时,渗透坡降就已经满足要求,土石坝的安全运行得到了保证。
Seepage problems are one of the main factors that affect the stability and safety of earth-rock dams. Due to the decreasing number of well-known dam sites in China and abroad at present, many dam projects to be constructed are likely to be located on non-homogeneous and infinitely deep permeable ground so that for earth-rock dams built on heterogeneous infinitely deep seepage foundation The seepage study has more practical significance. In order to reduce seepage flow as much as possible under the premise of safe operation of dam, this paper uses ABAQUS finite element software to analyze the seepage of micro-seepage prevention walls with different depths. When the depth of the cutoff wall reaches 10 times the depth of the dam, the effect of reducing the seepage flow is not obvious. When the depth of the cutoff wall is 2 times the depth of the dam, the permeability gradient has already met the requirements. Safe operation is guaranteed.