Numerical analysis of multiple slope failure due to rainfall: Based on laboratory experiments

The investigation of mechanisms of multiple slope failure and the displacement of the resulting failure mass is highly important for the safety of the mountainous environments of the world. This study attempts to investigate such phenomena through numerical analysis. A one-dimensional (1D) surface f...

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Bibliographic Details
Published in:Catena (Giessen) 2017-03, Vol.150, p.173-191
Main Authors: Regmi, Ram Krishna, Jung, Kwansue, Nakagawa, Hajime, Do, Xuan Khanh, Mishra, Binaya Kumar
Format: Article
Language:English
Subjects:
Dynamic programming
Experimental data
Failure surface
Multiple slope failure
Numerical analysis
Sliding block model
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Summary:The investigation of mechanisms of multiple slope failure and the displacement of the resulting failure mass is highly important for the safety of the mountainous environments of the world. This study attempts to investigate such phenomena through numerical analysis. A one-dimensional (1D) surface flow and erosion/deposition model, a two-dimensional (2D) seepage flow model, a 2D slope stability model (the Spencer method of slope stability analysis), and a 1D sliding block model were combined as a single unit such that the developed model can also successfully analyze the surface water flow and erosion/deposition on the model slope soil surface, seepage-flow phenomena within the soil domain, and stability of the model slope during the movement of the sliding mass by updating the shape of the model slope according to the new position of the sliding mass. The Spencer method of slope stability analysis was incorporated into dynamic programming to predict the time of a slope failure and the shape of the failure surface. The data obtained from the numerical simulation results were compared with the experimental data obtained from Regmi et al. (2014) for validation. The application of the model in the real field would have significant impact for appropriate mitigation measures against probable disasters that may be caused by rainfall-induced landslides and slope failures. •Experimental and numerical analysis of multiple slope failure•Numerical models were combined into a single unit.•The Spencer method of slope-stability analysis incorporated into dynamic programming•1D sliding block model to analyze the motion of the failure mass•Seepage-flow and slope stability analyses during the movement of the sliding mass
ISSN:0341-8162
1872-6887
DOI:10.1016/j.catena.2016.11.007