Study on Anti-seepage Performance of Embankment Cut-off Wall Based on SEEP/W Program

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 performance effect factors of cut-off wall's thickness and depth were analyzed.The results showed that the cutoff 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.