TY - JOUR
T1 - Analysis of Rainfall-induced Landslide Using the Extended DDA by Incorporating Matric Suction
AU - Guo, Longxiao
AU - Chen, Guangqi
AU - Gong, Shilin
AU - Sun, Hao
AU - Chantat, Krisadawat
N1 - Funding Information:
This work was supported by JSPS KAKENHI (Grant Number JP19KK0121) and SKLGP open fund (SKLGP2018K009). The financial supports are gratefully acknowledged. The authors also wish to thank the editor and other reviewers for useful suggestions.
Publisher Copyright:
© 2021 Elsevier Ltd
PY - 2021/7
Y1 - 2021/7
N2 - Rainfall-induced landslide is a common natural hazard, and one of the disaster-causing factors is the loss of apparent cohesion that is mainly caused by the dissipation of matric suction. To analyze the rainfall-induced landslide, especially the post-failure behaviors, a matric suction model is proposed and incorporated into the Discontinuous Deformation Analysis (DDA). In this model, the matric suction is simplified as an equivalent line load and updated at each time step. The safety factor of the simple sliding model simulated by the extended DDA (DDA_c) showed a good agreement with the limit equilibrium method. The simulated relationship between runout distance and the degree of saturation of the multi-block sliding model was validated by the experimental results. Finally, a rainfall-induced landslide in Fukuchi-machi was simulated using the extended DDA. The results illustrated that the apparent cohesion loss is an important mechanism for landslide initiation and a crucial reason for the long-runout distance. The presented DDA_c can be served as a qualified tool to analyze shallow slope stability and post-failure behavior involving apparent cohesion.
AB - Rainfall-induced landslide is a common natural hazard, and one of the disaster-causing factors is the loss of apparent cohesion that is mainly caused by the dissipation of matric suction. To analyze the rainfall-induced landslide, especially the post-failure behaviors, a matric suction model is proposed and incorporated into the Discontinuous Deformation Analysis (DDA). In this model, the matric suction is simplified as an equivalent line load and updated at each time step. The safety factor of the simple sliding model simulated by the extended DDA (DDA_c) showed a good agreement with the limit equilibrium method. The simulated relationship between runout distance and the degree of saturation of the multi-block sliding model was validated by the experimental results. Finally, a rainfall-induced landslide in Fukuchi-machi was simulated using the extended DDA. The results illustrated that the apparent cohesion loss is an important mechanism for landslide initiation and a crucial reason for the long-runout distance. The presented DDA_c can be served as a qualified tool to analyze shallow slope stability and post-failure behavior involving apparent cohesion.
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U2 - 10.1016/j.compgeo.2021.104145
DO - 10.1016/j.compgeo.2021.104145
M3 - Article
AN - SCOPUS:85104643207
VL - 135
JO - Computers and Geotechnics
JF - Computers and Geotechnics
SN - 0266-352X
M1 - 104145
ER -