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Geomechanics and Engineering Volume 13, Number 2, August 2017 , pages 353-370 DOI: https://doi.org/10.12989/gae.2017.13.2.353 |
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Modeling of shallow landslides in an unsaturated soil slope using a coupled model |
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Yongmin Kim and Sangseom Jeong
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| Abstract | ||
| This paper presents a case study and numerical investigation to study the hydro-mechanical response of a shallow landslide in unsaturated slopes subjected to rainfall infiltration using a coupled model. The coupled model was interpreted in details by expressing the balance equations for soil mixture and the coupled constitutive equations. The coupled model was verified against experimental data from the shearing-infiltration triaxial tests. A real case of shallow landslide occurred on Mt. Umyeonsan, Seoul, Korea was employed to explore the influence of rainfall infiltration on the slope stability during heavy rainfall. Numerical results showed that the coupled model accurately predicted the poromechanical behavior of a rainfall-induced landslide by simultaneously linking seepage and stress-strain problems. It was also found that the coupled model properly described progress failure of a slope in a highly transient condition. Through the comparisons between the coupled and uncoupled models, the coupled model provided more realistic analysis results under rainfall. Consequently, the coupled model was found to be feasible for the stability and seepage analysis of practical engineering problems. | ||
| Key Words | ||
| shallow landslide; unsaturated slope; coupled hydro-mechanical model; rainfall infiltration; matric suction; Mt. Umyeonsan | ||
| Address | ||
| (1) Yongmin Kim: School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore; (2) Sangseom Jeong: School of Civil and Environmental Engineering, Yonsei University, 50 Yonsei-ro, Seoul 120-749, Korea. | ||