Abstract
In view of the influence of dry-wet cycle on soil structure, the suction variation of different parts of the model dam slope was obtained, and the soil-water characteristic curve was drawn accordingly. According to the soil-water characteristic curve, the pore size of soil was analyzed. Based on the assumption that the pore size of soil was a sphere, the change of pore radius in the process of drought was analyzed, and the change of pore volume in the whole process of drought was studied. The results showed that the pore volume of soil without cracks would increase in the process of drought, and the greater the influence of dry-wet cycle condition was, the more obvious the change was. The increase of pore volume would reduce the compactness of soil and threaten the safety of filling engineering.
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