Research Of The Earth Dams' Seepage Field And Slope Stability Based On The Rain Infiltration

The rain infiltration directly influences the earth dams' distribution of pore water pressure and seepage field and it's a main revulsion factor of stability . A great many landslides are correlative to rainfalls. The paper analyzes and studies the changes of seepage field and dams' slope stability in various soil slopes under the condition of rain infiltration which is studied based on the saturated-unsaturated seepage theory and slope stability theory. The following is include:1.Fundamentals: Explaining the fundamentals of saturated-unsaturated seepage. Deducing the basic differential equation of saturated-unsaturated seepage in porous medium from fundamental physical equations and theorizing different initial and boundary conditions.2. Analysis and study on the unsaturated seepage under the condition of rain infiltration, and to deduce the FEM format of unsaturated seepage differential equation.3.The Study on the parameters that affect the seepage field of unsaturated slopes based on the software of GEO-SLOPE OFFICE(SEEP/W module), mainly including:(1) The combination of different rainfall intensity, type and the changes of upriver water level;(2) The influence of different medium, e.g. the soil-water characteristic curve, the coefficient of saturated hydraulic conductivity and the initial state of medium;4. Explaining the basal theory of saturated-unsaturated slopes'stability and analyzing the influence of rain infiltration under different conditions based on the software of GEO-SLOPE OFFICE(SLOPE/W module) .In the paper, the influence of rain infiltration on the slope stability is discussed,which is very helpful for forecasting dams' slope stability in raining seasons and designing unsaturated slopes.