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DOI码：10.1016/j.compgeo.2025.107317

发表刊物：Computers and Geotechnics

关键字：Debris flow; Basal friction; SPH; Coulomb-viscoplastic model; Boundary condition

摘要：Basal friction is fundamental to understanding debris-flow behavior as it strongly influences transport dynamics, energy dissipation, and sediment deposition on rough channel beds. Although frictional effects are well addressed in mesh-based continuum models, incorporating them into Lagrangian particle based frameworks remains challenging due to complex interfacial interactions and truncation errors. To bridge this gap, we integrate the Coulomb-Viscoplastic Sliding Boundary (CVSB) into a 3D-SPH scheme, enabling adaptive capture of sliding behavior and enhancing simulation accuracy over rough channels. Unlike conventional no-slip treatment, the CVSB explicitly incorporates basal friction via a friction coefficient and prescribes a pressure- and deformation dependent sliding velocity, in accordance with Coulomb friction laws and debris-flow rheology. The newly developed CVSB is embedded in a modified Dynamic Boundary Condition (mDBC) framework and integrated into our existing HBP-SPH model. Validation against a series of full-scale flume experiments with varying surface configurations demonstrates that the CVSB-based SPH model accurately reproduces experimental observations, including flow-front evolution, propagation velocity profile, and runout areas. Sensitivity analyses further reveal that higher basal friction amplifies debris-flow responsiveness to rheological fluctuations, underscoring its potential impact on the relative contributions of inertial and viscous effects in debris-flow motion. Overall, the proposed model demonstrates significant potential for improving disaster mitigation strategies by providing enhanced predictions of flow propagation and deposition.

备注：中科院一区、TOP期刊

合写作者：(中科院一区、TOP期刊) Su Bin, Han Zheng, Ma Yangfan (Corresponding author), Li Yange, Ding Haohui, Chen Guangqi

论文类型：期刊论文

论文编号：107317

卷号：185

页面范围：107317

是否译文：否

发表时间：2025-04-30

收录刊物：SCI