Abstract: It is known that the temperature variations and dry-wet cycles have effects on the on the physical properties of red clay. To further accurately study the influence of temperature and dry-wet cycles on the liquid plastic limit of red clay, the Guilin red clay was used as the study target. Under the same conditions of moisture content and degree of compaction, the red clay soil samples were subjected to dry-wet cycles and did not experience dry-wet cycles. The test results show that, the plastic limit, liquid limit and plastic index of the soil at different temperatures and different cycles are not fixed values. Comparing the red clay that has experienced the dry-wet cycle and that did not experience the dry-wet cycle, at the same curing temperature, with the increase of the number of cycles, the w_L of the soil sample gradually decreases, but the w_P and I_P of the soil sample have no obvious change; Under the same number of cycles, as the temperature increases, the w_L and I_P of the soil samples first decrease and then increase, while the w_P gradually increases. 

Key words: temperature, dry-wet cycles, plastic limit, liquid limit, plastic index