Simplied Method for Stability Analysis of Two-layered Slope Under Rainfall Infiltration
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Abstract
Due to its ease to use, the Green-Ampt model is potentially very useful for infiltration analysis for predicting of slope failure. In this study, the governing equation for infiltration analysis on sloping surfaces in layered soils is derived. The depth of wetting front predicted from the modified Green-Ampt model is close to that predicted based on Richards' function. Based on the limit equilibrium method, the safety factor calculation.in layered slope is proposed. Research shows that along with the increase of the rainfall, the wetting front position down gradually and the safety factor decreases.When the lower soil's strength is higher, the most dangerous sliding surface will be at the bottom of the first layer of soil, the safety factor will not change with time. However, when the infiltration depth is large enough, the most dangerous sliding surface will locate at the wetting front again, the safety factor will change.And, the safety factor is influenced by the rainfall intensity and slope angle, thus the slope will be more instability under the condition of high rainfall strength and steep slopes. In this paper, the modified method is simple, can be more easily applied to the engineering practice, and has value to further study.
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