以沁河河道现状堤防为研究对象，通过对工程地质条件的分析，建立地质概化模型，采用地下水渗流程序Geo Studio-Seep／W建立二维有限元模型，分析截渗墙的深度和厚度对防渗性能的影响。研究结果表明：截渗墙明显降低了地下水的浸润面，增加了非饱和土的范围，同时减少了高水头的范围，对大堤和堤基土的稳定性有利；截渗墙对断面流量、出逸高度和出逸坡降都有明显的降低，而截渗墙厚度对以上因素的影响不大；全截式截渗墙的防渗效果最好，改变全截式截渗墙的深度，防渗效果没有改变，截渗墙厚度为20 cm、深入相对隔水层1～2 m时，可满足防渗要求。%Based on the study object of Qin river actuality embankment , the geological generalized model was established by engineering geological conditions analysis and two-dimensional finite element model was built through the Geo Studio-Seep/W of underground water seepage procedure. The anti-seepage perfor-mance effect factors of cut-off wall’s thickness and depth were analyzed. The results showed that the cut-off wall reduced the seepage surface of underground water , increased the range of unsaturated soil while reduced the high head range which were favorable to embankment and its foundation soil. The seepage flow, exit height and exit hydraulic gradient were reduced significantly by cut-off wall. The full-cut type had best anti-seepage performance, but the thickness had less effect on these factors. When the depth of full-cut type changed, the anti-seepage performance was not changed, so it could meet the anti- seepage requirements when the cut-off wall had the thickness of 20 cm and cutting in the relative impermeable layer with the depth of 1-2 m. Research method can provide a reference to the design of embankment cutoff wall.
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