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Micromechanics-based binary-medium constitutive model for frozen soil considering the influence of coarse-grained contents and freeze–thaw cycles
In cold regions, the deformation characteristics of frozen soils with different coarse-grained contents change significantly under the freeze–thaw (F-T) cycles. A series of cryogenic triaxial compression tests were conducted to investigate the deformation characteristics of frozen soil at −10 °C experiencing freeze–thaw cycles. The results indicated that the stress–strain response is nonlinear, elastoplastic accompanied by strain hardening, and volumetric compaction followed by dilatancy for a given coarse-grained content and F-T cycle. To reveal the aforementioned mechanisms, a micromechanics-based binary-medium constitutive model combining the breakage mechanics for geomaterials theory and the homogenization method is proposed. The following salient features of the proposed model in terms of micro–meso–macro scales are summarized: (i) The frozen soil is idealized as a representative volume element (RVE) at the macroscale, which is composed of elastic bonded elements and elastoplastic frictional elements at the mesoscale. The meso–macro upscaling process for frozen soil is described as the binary-medium constitutive. Furthermore, the Mori–Tanaka method is employed to describe the non-uniform deformation between macro-RVE and mesoscale bonded elements in frozen soil. (ii) At the microscale, the micro–meso upscaling process of the bonded elements is performed by employing the homogenization method which allows for considering the ice cementation breakage and the influence of coarse-grained contents. Meanwhile, for the frictional element, considering the microplastic deformation is related to the frictional sliding mechanism, a Drucker–Prager yield criterion and a non-associate flow rule based on the homogenization approach are proposed. Finally, the developed micromechanics-based binary-medium constitutive model can describe the deformation mechanism of frozen soil from both micro- to meso-scale and from meso- to macro-scale simultaneously, and the deformation of frozen soil with different coarse-grained contents under different F-T cycles is well predicted.
Micromechanics-based binary-medium constitutive model for frozen soil considering the influence of coarse-grained contents and freeze–thaw cycles
In cold regions, the deformation characteristics of frozen soils with different coarse-grained contents change significantly under the freeze–thaw (F-T) cycles. A series of cryogenic triaxial compression tests were conducted to investigate the deformation characteristics of frozen soil at −10 °C experiencing freeze–thaw cycles. The results indicated that the stress–strain response is nonlinear, elastoplastic accompanied by strain hardening, and volumetric compaction followed by dilatancy for a given coarse-grained content and F-T cycle. To reveal the aforementioned mechanisms, a micromechanics-based binary-medium constitutive model combining the breakage mechanics for geomaterials theory and the homogenization method is proposed. The following salient features of the proposed model in terms of micro–meso–macro scales are summarized: (i) The frozen soil is idealized as a representative volume element (RVE) at the macroscale, which is composed of elastic bonded elements and elastoplastic frictional elements at the mesoscale. The meso–macro upscaling process for frozen soil is described as the binary-medium constitutive. Furthermore, the Mori–Tanaka method is employed to describe the non-uniform deformation between macro-RVE and mesoscale bonded elements in frozen soil. (ii) At the microscale, the micro–meso upscaling process of the bonded elements is performed by employing the homogenization method which allows for considering the ice cementation breakage and the influence of coarse-grained contents. Meanwhile, for the frictional element, considering the microplastic deformation is related to the frictional sliding mechanism, a Drucker–Prager yield criterion and a non-associate flow rule based on the homogenization approach are proposed. Finally, the developed micromechanics-based binary-medium constitutive model can describe the deformation mechanism of frozen soil from both micro- to meso-scale and from meso- to macro-scale simultaneously, and the deformation of frozen soil with different coarse-grained contents under different F-T cycles is well predicted.
Micromechanics-based binary-medium constitutive model for frozen soil considering the influence of coarse-grained contents and freeze–thaw cycles
Acta Geotech.
Wang, Dan (author) / Liu, Enlong (author) / Yang, Chengsong (author) / Wang, Pan (author) / Song, Bingtang (author)
Acta Geotechnica ; 18 ; 3977-3996
2023-08-01
20 pages
Article (Journal)
Electronic Resource
English
Binary-medium constitutive model , Coarse-grained content , Deformation properties , Freeze–thaw cycles , Frozen soil , Micromechanics Engineering , Geoengineering, Foundations, Hydraulics , Solid Mechanics , Geotechnical Engineering & Applied Earth Sciences , Soil Science & Conservation , Soft and Granular Matter, Complex Fluids and Microfluidics
Dynamic responses of frozen subgrade soil exposed to freeze-thaw cycles
| Elsevier | 2021