Unsaturated seepage and stress coupling of reservoir landslides considering the water-induced deterioration effect

Abstract

Water has an obvious degrading effect on the mechanical parameters of rock and soil.In this paper, triaxial tests of landslide deposits under different water content conditions were carried out, and empirical equations between saturation and mechanical parameters were established. Besides, secondary development on the established empirical equation was also carried out. Based the coupling of saturation and mechanical parameters, the influence of sliding body mechanical parameter changes on the landslide stability can then be considered in the process of real-time changes in reservoir water level.By comparing the simulation results of the Dahua landslide in Lanping County, Yunnan Province during the rise of the reservoir water level with the field monitoring data, the rationality of considering the water-induced deterioration effect of the mechanical parameters of the sliding body was verified.In the end, the engineering application of the deformation evolution law of the Dahua landslide considering water-induced deterioration was carried out.

Keywords

• water-induced landslide
• water-induced deterioration
• saturation
• saturated-unsaturated seepage
• coupling of seepage and stress
• dahua landslide