Influence of linear coupling between volumetric and shear strains on instability and post-peak softening of sand in direct simple shear tests

This paper focuses on the influence of volume change boundary condition on the instability and post-peak softening of sand. The laboratory program comprises an extensive series of Direct Simple Shear (DSS) tests with different degrees of linear coupling between volumetric and shear strains. It is ob...

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Bibliographic Details
Published inActa geotechnica Vol. 16; no. 11; pp. 3467 - 3488
Main Authors Lashkari, A., Falsafizadeh, S. R., Rahman, Md. M.
Format Journal Article
LanguageEnglish
Published Berlin/Heidelberg Springer Berlin Heidelberg 01.11.2021
Springer Nature B.V
Subjects
Boundary conditions
Complex Fluids and Microfluidics
Constitutive models
Coupling
Engineering
Foundations
Geoengineering
Geotechnical Engineering & Applied Earth Sciences
Hydraulics
Hydrostatic pressure
Instability
Pore water pressure
Research Paper
Sand
Shear strain
Shear strength
Shear tests
Simple shear tests
Soft and Granular Matter
Softening
Soil Science & Conservation
Solid Mechanics
Stability
Stability analysis
Trends
Vulnerability
Water pressure
Critical state
Sand
Volumetric strain
Constitutive model
Instability
Flow behavior
Dilatancy
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Summary:This paper focuses on the influence of volume change boundary condition on the instability and post-peak softening of sand. The laboratory program comprises an extensive series of Direct Simple Shear (DSS) tests with different degrees of linear coupling between volumetric and shear strains. It is observed that progressive loosening of sand associated with the volumetric expansion in a coupled strain path intensifies instability susceptibility, whereas volumetric contractive strains reduce vulnerability to instability and post-peak softening. Analysis of the experimental data using Hill’s second-order work criterion designates a family of state-dependent relational trends for instability lines, normalized peak shear strengths, and maximum pore-water pressure ratios depending on the degree of coupling between the volumetric and shear strain rates. It is found that a simple state-dependent constitutive model can predict relational trends in sand specimens suffering from instability and post-peak softening under different degrees of the linear coupling between the volumetric and shear strains.
ISSN:1861-1125
1861-1133
DOI:10.1007/s11440-021-01288-5