Simulation Analysis on the Evolution Process of Rainfall-induced Landslide Under Dry-wet Conditions

The geological hazards of rainfall-induced accumulation slope are very common in south of China. It is of great theoretical and practical significance to reveal the law of instability evolution for the monitoring and early warning of soil landslide in mountainous and hilly areas of China. Based on the generalized model of typical geological landslides and rainfall model of rainfall induced landslide in western Hubei area, combined the Geo-Studio software, the evolution process of the slope destabilizing were discussed from the aspects of seepage field, stress field and displacement field of wet and dry conditions. Compared with the slope that has not experienced long-term drought, the long-term drought can make rainfall infiltrate deeper into the slope, the variation range of matrix suction is larger, and the soil displacement in the slope caused by rainfall is larger at the same time. Under drought conditions, it is obvious that the plastic zone with large area is distributed along the slope foot, and the slope is more likely to fail and fail eventually. The research results play a positive role in promoting the theoretical development of the prevention and control of landslide geological hazards in western Hubei province.