Analysis of Rainfall-induced Landslide Using the Extended DDA by Incorporating Matric Suction

Rainfall-induced landslide is a common natural hazard, and one of the disaster-causing factors loss apparent cohesion that mainly caused by dissipation matric suction. To analyze rainfall-induced landslide, especially post-failure behaviors, suction model proposed incorporated into Discontinuous Deformation Analysis (DDA). In this model, simplified as an equivalent line load updated at each time step. The safety factor simple sliding simulated extended DDA (DDA_c) showed good agreement with limit equilibrium method. relationship between runout distance degree saturation multi-block was validated experimental results. Finally, in Fukuchi-machi using DDA. results illustrated important mechanism for initiation crucial reason long-runout distance. presented DDA_c can be served qualified tool to shallow slope stability behavior involving cohesion.