Characteristics Analysis of Seepage Field in Foundation Pit with Considering Different Soil Properties

To reduce the negative influence of the groundwater upon foundation pit excavation and surrounding environment,analysis of seepage field becomes very important in deep excavation projects.A series of three-dimensional finite element method are conducted in this paper to analyze the seepage field characteristics in foundation pits.Then the influence of seepage field on soil stabilization under different soil property conditions were studied.Variation laws of main physical quantities,such as contours of pressure head,flow vector and hydraulic gradient,with different soil properties in foundation pit excavation were presented.Some disadvantageous aspects probably appearing in the project were discussed.The analysis shows that contours of pressure head have the tendency to gather towards soil with lower permeability coefficient and maximum value of hydraulic gradient in isotropic unstratified soil occurs between angular point and spillpoint where seepage failure occurs easily.The analysis results also show that foundation pit tends to fail in anisotropic soil when horizontal permeability coefficient is larger than that of vertical.