Two-dimensional landslide dynamic simulation based on a velocity-weakening friction law |
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Authors: | Wei Liu Siming He Xinpo Li Qiang Xu |
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Affiliation: | 1.Key laboratory of Mountain Hazards and Earth Surface Process,Chinese Academy of Sciences,Chengdu,China;2.Institute of Mountain Hazards and Environment (IMHE),Chinese Academy of Sciences,Chengdu,China;3.Center for Excellence in Tibetan Plateau Earth Sciences,Chinese Academy of Sciences,Beijing,China;4.National Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu,China |
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Abstract: | Surprisingly, hypermobility (high velocity and long run-out) is a remarkable feature of large landslides and is still poorly understood. In this paper, a velocity-weakening friction law is incorporated into a depth-averaged landslide model for explaining the higher mobility mechanism of landslides. In order to improve the precision of the calculation, a coupled numerical method based on the finite volume method is proposed to solve the model equations. Finally, several numerical tests are performed to verify the stability of the algorithm and reliability of the model. The comparison between numerical results and experimental data indicates that the presented model can predict the movement of landslide accurately. Considering the effect of velocity-weakening friction law, the presented model can better reflect the hypermobility of landslide than the conventional Mohr–Coulomb friction model. This work shows that the application of a universal velocity-weakening friction law is effective in describing the hypermobility of landslide and predicting the extent of landslides. |
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