Subgrade And Pavement Seepage Analysis And Slope Stability Under Rainfall Conditions

Aiming at the problem of water damage of pavement and instability of slopes under the condition of rain , the dissertation focus on the changes of seepage field in the subgrade and pavement under the condition of rain and its influence to stability of slopes. As a whole , the primary contents are as follows:(1)Based on the fundamental seepage physical equation , the basic differential equation of saturated-unsaturated seepage in porous mediums has been deduced , in which the pressure head is the fundamental unknown quantity , A calculated model for analysis of saturated-unsaturated seepage field with the boundary condition of rain infiltration also has been developed.(2)Using the SEEP/W of GEO-SLOPE ,the dissertation computes the seepage field of nineteen projects , in which fill model has nine , and excavation model has five , and cut-fill model has five , under the rainfall intensity — 6.24E-6m/s , 7.26E-6m/s 8.49E-6m/s and 9.22E-6m/s6.24E-6m/s 7.26E-6m/s, 8.49E-6m/s ft 9.22E-6m/s , And also analyzes the seepage rule of the projects.(3)Based on the total strength theory and the routine method analyzing the slope stability and using the SLOPE/W of GEO-SLOPE , the dissertation computes safety coefficient of slopes under the different rainfall intensity and rainfall duration and the constitutions of subgrade and pavement , evaluates the computed results and gets some conclusions.(4)From analyzing the changes of seepage field and stability of slopes for the different constitutions of subgrade and pavement , we can get some significative conclusions.