期刊
COMPUTATIONAL PARTICLE MECHANICS
卷 5, 期 4, 页码 529-537出版社
SPRINGER INTERNATIONAL PUBLISHING AG
DOI: 10.1007/s40571-018-0188-5
关键词
Material point method; Granular flow; Impact force; Soil-structure interaction
资金
- NSFC [41472293, 41661144041, 41672356, 41702331]
- Belt & Road International Cooperation Team Project of CAS
- Hundred Talents Program of CAS
- STS Project of CAS [KFJ-EW-STS-094]
- 135 Strategic Program of IMHE, CAS [SDS-135-1704]
Protective measures against hazards associated with rapid debris avalanches include a variety of retaining structures such as rock/boulder fences, gabions, earthfill barriers and retaining walls. However, the development of analytical and numerical methods for the rational assessment of impact force generated by granular flows is still a challenge. In this work, a soft-rigid contact model is built under the coding framework of MPM which is a hybrid method with Eulerian-Lagrangian description. The soft bodies are discretized into particles (material points), and the rigid bodies are presented by rigid node-based surfaces. Coulomb friction model is used to implement the modeled contact mechanics, and a velocity-dependent friction coefficient is coupled into the model. Simulations of a physical experiment show that the peak and residual value of impact forces are well captured by the MPM model. An idealized scenario of debris avalanche flow down a hillslope and impacting on a retaining wall are analyzed using the MPM model. The calculated forces can provide a quantitative estimate from which mound design could proceed for practical implementation in the field.
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