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A smoothed particle hydrodynamics modelling of soil–water mixing and resulting changes in average strength
Author(s) -
Zhang Wangcheng,
Randolph Mark F.
Publication year - 2020
Publication title -
international journal for numerical and analytical methods in geomechanics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.419
H-Index - 91
eISSN - 1096-9853
pISSN - 0363-9061
DOI - 10.1002/nag.3077
Subject(s) - smoothed particle hydrodynamics , landslide , geotechnical engineering , mechanics , mixing (physics) , underwater , geology , viscoplasticity , particle (ecology) , physics , constitutive equation , finite element method , thermodynamics , quantum mechanics , oceanography
Summary Soil–water interaction is a pivotal process in many underwater geohazards such as underwater landslides where soil sediments gradually evolve into turbidity currents after interactions with ambient water. Due to the large deformations, multiphase interactions and phase changes this involves, investigations from numerical modelling of the transition process have been limited so far. This study explores a simple numerical replication of such soil–water mixing with respect to changes in average strength using smoothed particle hydrodynamics (SPH). A uniform viscoplastic model is used for both the solid‐like and fluid‐like SPH particles. The proposed numerical solution scheme is verified by single‐phase dam break tests and multiphase simple shear tests. SPH combinations of solid‐like and fluid‐like particles can replicate the clay–water mixture as long as the liquidity index of the solid‐like particles is larger than unity. The proposed numerical scheme is shown to capture key features of an underwater landslide such as hydroplaning, water entrainment and wave generation and thus shows promise as a tool to simulate the whole process of subaquatic geohazards involving solid–fluid transition during mass transport.