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Investigating the dynamic process of a rock avalanche through an MLS-MPM simulation incorporated with a nonlocal μ(I) rheology model

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Abstract

Rock avalanches typically entail the flow-like motion of angular rock blocks and fragments of diverse size. Numerical simulations are instrumental in understanding their dynamic process, supporting hazard and risk assessments. Simplified failure criteria, such as the Mohr-Coulomb or Drucker-Prager, are commonly adopted in landslide models relying on the material point method (MPM). However, these criteria cannot capture the transitions between solid-like, liquid-like, and gas-like behaviors exhibited by granular materials. Here, we relied on the moving least-squares MPM, which offers high computing efficiency and stability, and adopted a nonlocal μ(I) rheology model implemented by Haeri and Skonieczny (Comput Methods Appl Mech Eng, 2022). This approach can account for the rate-dependent, pressure-dependent, and size-dependent characteristics of friction in granular materials. By simulating a small-scale flume experiment as well as a large-scale event (the Nayong rock avalanche in Guizhou, China), we verified that the nonlocal μ(I) rheology model can capture the motion and deposition processes in rock avalanches effectively. This feature can be advantageous in physically based hazard assessments of such events.

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Funding

This work was supported by the National Key Research and Development Program of China (Project No. 2022YFF0800604), the Major Program of the National Natural Science Foundation of China (Grant No. 42090051), the Youth Innovation Promotion Association of the Chinese Academy of Sciences (2021373) and the National Natural Science Foundation of China (Grant No. 41877291 and Grant No. 42172320).

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Correspondence to Siming He or Xinpo Li.

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Zhao, S., He, S., Li, X. et al. Investigating the dynamic process of a rock avalanche through an MLS-MPM simulation incorporated with a nonlocal μ(I) rheology model. Landslides (2024). https://doi.org/10.1007/s10346-024-02244-6

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  • DOI: https://doi.org/10.1007/s10346-024-02244-6

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