Abstract
The wetting-drying effect of expansive soils plays an important role in slope stability analysis. According to the depth of atmospheric effect and the field observation data of moisture content, laboratory experiments on the strength of expansive soil with two wetting-drying cycle amplitudes were performed to discuss on the wetting-drying effect of expansive soil. The results show that the shear strength of expansive soil decreases with increasing number of cycles and finally reaches to a constant state. The value and cycle number of the constant state reduce with increase of amplitude of variation of water content. Furthermore, the stability analysis of expansive soil slope is studied with considering the wetting-drying effect. The results may provide the reference for the parameter selection in slope design.
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