Abstract: In order to study the effect of dry density on Guilin red clay under drying-wetting cycles, soil samples with different dry densities were prepared under various dry-wet cycles. Then prepared sampled were performed with various tests, such as, shear strength, one dimension compression, and permeability. The test results show that under the effect of the optimal moisture content, the shear strength of the soil increases with the increase of dry density; when the moisture content and dry density are constant, the shear strength of the soil decreases with the increase of the number of drying-wetting cycles; When the moisture content and the number of cycles is constant, the soil with high dry density has the low shrinkage property. As the number of drying and wetting cycles increases, the shrinkage of the soil decreases significantly; when the moisture content and the number of cycles is constant, the dry density increases and compresses The coefficient decreases, as the number of wetting-drying cycles increases, the compressive modulus increases; when the moisture content is constant, the permeability coefficient decreases with the increase of dry density, and increases with the increase of wetting-drying cycles.

Key words: Red Clay, Dry Density, Drying-Wetting Cycles, Shear Strength, One Dimensional Shrinkage, Volume Shrinkage Rate, Compression Coefficient, Compression Modulus, Permeability Coefficient