Research on Instability Modes of Expansive Soil Slope Under the Impacts of Rainfall Seepage and Overload
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Abstract:
Unstable modes of expansive and replacement soil slope under the impacts of rainfall seepage and overload in the Middle Route of South-to-North Water Diversion Project were investigated using the limit equilibrium theory. The most dangerous instability mode and state of unstable destruction were obtained. The results showed that (1) the most dangerous sliding surface is the single curved surface or compound curved surface which has rupture surface between blocks in the shallow layer of expansive soil slope; and (2) the overload of slope top has significantly adverse impacts on slope stability. The limit overload value of of slope top is about 0.44 times of the weight of the soil column with the slope height or 1.4 times of the weight of the uniformly distributed load produced by the car with a carrying capacity of 20 tons. The results can provide beneficial reference for the reasonable design and safe construction and operation of the project.
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