Sand instability under constant shear drained stress path

Experimental findings have revealed that granular soils are vulnerable to pre-failure instability when subjected to constant shear drained (CSD) stress path. Using the concept of loss of uniqueness, it is shown that two dissimilar scenarios and accordingly, two independent criteria for granular soil...

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Bibliographic Details
Published inInternational journal of solids and structures Vol. 150; pp. 66 - 82
Main Authors Alipour, M.J., Lashkari, A.
Format Journal Article
LanguageEnglish
Published New York Elsevier Ltd 01.10.2018
Elsevier BV
Subjects
Computer simulation
Constitutive model
Constitutive models
Elastoplasticity
Instability
Loss of uniqueness
Mathematical models
Numerical analysis
Sand
Sand & gravel
Simulation
Soil stability
Soils
Stability criteria
State
Stress ratio
Instability
Constitutive model
Sand
Loss of uniqueness
State
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Summary:Experimental findings have revealed that granular soils are vulnerable to pre-failure instability when subjected to constant shear drained (CSD) stress path. Using the concept of loss of uniqueness, it is shown that two dissimilar scenarios and accordingly, two independent criteria for granular soils in loose and dense states may lead to instability under CSD. The instability criteria are then applied in association with a state-dependent elastoplastic constitutive model taking into account possibility of elastic-plastic coupling. Numerical simulations have confirmed that instability in loose sands triggers prior to complete mobilization of the critical state stress ratio. However, instability of sands in dense state instigates at peak mobilized friction angle. A nearly unique linkage between stress ratio and state parameter at the onset of instability is predicted.
ISSN:0020-7683
1879-2146
DOI:10.1016/j.ijsolstr.2018.06.003