Geological Engineering: Proceedings of the 1st International Conference (ICGE 2007)
85 Some Supplements of the Controlling Factors for Stability of Unsaturated Soil Slope
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It has a remarkable influence on the slope stability with the infiltration of rainfall and reservoir water to unsaturated soil zones, which can not only change the mechanical parameters of soils on the slip surface, but also promote the static and dynamic water pressure of the soil body, thus resulting in the instability of the slopes and landslides. But under different hydraulic conditions, the affect mechanism on the slope stability of the infiltration is different, so that the controlling factors are different. In the paper, an elasto-plastic incremental stiffness matrix for unsaturated soil is introduced and the program has been compiled based on the extension Mohr-Coulomb yield criterion. Then associated with four underground water levels and corresponding negative pore-water pressure of different time, the influencing rules on the deformation and stability of unsaturated soil slope have been analyzed about the mechanical parameters of slip surface soils, the gradient of underground water levels and the location relationship between the levels and the slip surface, so that the controlling factors for stability of unsaturated soil slope can be ascertained.