Research on landslide stability under different water content conditions based on the dynamic residual strength

Long-term rainfall causes progressive damage to a slope. In this process, the slip zone soil will reach the residual strength under different water-containing states with the change of water content. The traditional strain softening model cannot accurately express the dynamic characteristics of the residual strength of the slip zone soil during this change, resulting in difficulty to get close to reality in the simulation of the landslide development process. The strain softening model that involves the dynamic residual strength can more realistically simulate the development of the stability of the landslide when the water content changes. Based on this, the field investigation was carried out on the Kualiangzi landslide in Zhongjiang County in Sichuan, and the slip zone soil was obtained through the on-site shaft. The ring shear test is used to study the relationship between the mechanical parameters of the slip zone soil and the water content, and a strain softening model based on the dynamic residual stre