Study of anti-seepage measures for foundation pit based on saturated-unsaturated seepage theory

Saturated-unsaturated seepage theory is applied to calculate seepage in riverside foundation pit;and the seepage stability of the foundation pit is evaluated;also the best anti-seepage measures and corresponding parameters of this foundation pit are determined.The results show that the slope soil of foundation pit is instable without anti-seepage measures,so that the anti-seepage measures must be adopted.The steel sheet piles are adopted from the perspectives of convenient for construction;it is located at about 6.0 m distance to the foundation pit’s right slope.The length of steel sheet pile has remarkable effect on the seepage field;they should drill through silty sand layer,thus can play a better anti-seepage effect,so as to benifit the stability of foundation pit slope.In addition the steel sheet pile should not too long,because increasing the length of steel sheet pile not only waste materials,but also the effect is not better;the best length is 15.4m.