TY - JOUR
T1 - Numerical investigation of rainfall-induced landslide in mudstone using coupled finite and discrete element analysis
AU - Hung, Ching
AU - Liu, Chih Hsuan
AU - Chang, Chia Ming
N1 - Funding Information:
The authors gratefully acknowledge financial support from the Ministry of Science and Technology (MOST) in Taiwan: Grants 107-2636-E-006-003 and 106-2221-E-006-061. Special thanks go to the Young Scholar Fellowship Program by the Ministry of Science and Technology in Taiwan (The Pilot Directions for MOST Grant for the Columbus Program). The research, in part, received funding from the Headquarters of University Advancement at the National Cheng Kung University, which is sponsored by the Ministry of Education, Taiwan, ROC. The authors appreciate the colleagues in our laboratory for their constructive comments and assistance.
Publisher Copyright:
Copyright © 2018 Ching Hung et al.
PY - 2018
Y1 - 2018
N2 - In this study, the role of water infiltration on a rainfall-induced landslide in mudstone is investigated. Finite element analysis (FEA) and discrete element analysis (DEA) were employed to explore the driving mechanism in the prefailure regime and the dynamic runout process in the postfailure regime, respectively. The driving mechanism was revealed in terms of the pore water pressures, saturation, and displacement of the sliding zone. To account for water infiltration associated with the dynamic runout process of the landsliding, the sliding friction coefficient in DEA was examined. Based on the results, satisfactory agreement between the numerical analysis and landslide behavior was realized. In prefailure regime, the onset of landslide initiation was found through assessment of rapid change of source displacement (RCSD). The estimated seepage force was about 0.5 N at landslide initiation. In postfailure regime, the results demonstrate that water infiltration and transition in steepness play significant roles in the behavior of the dynamic runout process. The landsliding exhibited a maximum speed of 4.41 m/s and decelerated as it reached a more gentle slope. Overall, the study indicated that the coupling of FEA and DEA can be used to investigate the role of water infiltration and provide useful insights. The approach can be further applied for studies on many other rainfall-induced geohazards to disclose the role of water infiltration with the prefailure and postfailure characteristics.
AB - In this study, the role of water infiltration on a rainfall-induced landslide in mudstone is investigated. Finite element analysis (FEA) and discrete element analysis (DEA) were employed to explore the driving mechanism in the prefailure regime and the dynamic runout process in the postfailure regime, respectively. The driving mechanism was revealed in terms of the pore water pressures, saturation, and displacement of the sliding zone. To account for water infiltration associated with the dynamic runout process of the landsliding, the sliding friction coefficient in DEA was examined. Based on the results, satisfactory agreement between the numerical analysis and landslide behavior was realized. In prefailure regime, the onset of landslide initiation was found through assessment of rapid change of source displacement (RCSD). The estimated seepage force was about 0.5 N at landslide initiation. In postfailure regime, the results demonstrate that water infiltration and transition in steepness play significant roles in the behavior of the dynamic runout process. The landsliding exhibited a maximum speed of 4.41 m/s and decelerated as it reached a more gentle slope. Overall, the study indicated that the coupling of FEA and DEA can be used to investigate the role of water infiltration and provide useful insights. The approach can be further applied for studies on many other rainfall-induced geohazards to disclose the role of water infiltration with the prefailure and postfailure characteristics.
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U2 - 10.1155/2018/9192019
DO - 10.1155/2018/9192019
M3 - Article
AN - SCOPUS:85064073946
VL - 2018
JO - Geofluids
JF - Geofluids
SN - 1468-8115
M1 - 9192019
ER -