A coupled hydro-mechanical constitutive model for unsaturated frictional and cohesive soil

Gholizadeh, Esmaeel; Latifi, Manoucher

doi:10.1016/j.compgeo.2017.11.010

Cited by 19 publications

(7 citation statements)

References 38 publications

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“…e triaxial shear test shows that 4 Advances in Civil Engineering initial Poisson's ratio is related to the confining pressure [9,12]. As shown in Figure 5(c), it is assumed that…”

Section: Conventional Triaxial Loading Test Under Conventional Triaxial Loading Conditions (1) Can Be Written Asmentioning

confidence: 99%

“…e mechanical properties of soils are determined by many factors, including externally applied stress, soil type, microstructure damage [6], density, matrix suction caused by surface tension passing through the air in unsaturated environments [7], and temperature [8][9][10]. To date, many constitutive models of saturated/unsaturated soil have been proposed, but there are still many controversies regarding some basic problems [9,11], such as the selection of state variables of stress and strain and the theoretical framework of hydraulic coupling processes [12,13]. Alonso et al [14] established a constitutive model of unsaturated soil materials by utilizing the double-stress variables of net stress and matrix suction.…”

Section: Introductionmentioning

confidence: 99%

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A Constitutive Model of Sandy Gravel Soil under Large‐Sized Loading/Unloading Triaxial Tests

Zhang

Feng³

et al. 2021

Advances in Civil Engineering

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Based on large-scale triaxial tests of sandy gravel materials, the strength and deformation characteristics under loading/unloading conditions are analyzed. At the same time, the applicability of the hyperbolic constitutive model to sandy gravel is studied using experimental data. The results indicate that sandy gravel under low confining pressures (0.2 and 0.4 MPa) shows a weak softening trend; the higher the confining pressure, the more obvious the hardening tendency (0.6 and 0.8 MPa) and the greater the peak strength. During unloading tests, strain softening occurs, and the peak strength increases with increasing confining pressure. During loading tests, dilatancy appears when the confining pressure is low (0.2 MPa). With increasing confining pressure (0.4, 0.6, and 0.8 MPa), the dilatancy trend gradually weakens, and the cumulative volume tric strain increases, which reflects the relevance of the stress paths. Through research, it is found that the hyperbolic constitutive model has good applicability to sandy gravel soils, and the corresponding model parameters are obtained.

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“…e triaxial shear test shows that 4 Advances in Civil Engineering initial Poisson's ratio is related to the confining pressure [9,12]. As shown in Figure 5(c), it is assumed that…”

Section: Conventional Triaxial Loading Test Under Conventional Triaxial Loading Conditions (1) Can Be Written Asmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Constitutive Model of Sandy Gravel Soil under Large‐Sized Loading/Unloading Triaxial Tests

Zhang

Feng³

et al. 2021

Advances in Civil Engineering

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“…A comprehensive discussion has been given by Nikooee et al 62 and Chalak et al 76 that includes the areal mass densities of the interfaces, the specific interfacial areas, the temperature, and the saturation, as potential state variables. In addition, experiments based on wetting induced deviatoric strain, 88 as well as X-ray tomography, 93 showed that there exists a suction induced stress anisotropy, which can be modeled through a fluid fabric tensor. A consequence of such behavior is that there exists not only an effective normal stress but also an effective shear stress, related to the state of saturation.…”

Section: Internal Energymentioning

confidence: 99%

A linear constitutive model for unsaturated poroelasticity by micromechanical analysis

Cheng

2019

Num Anal Meth Geomechanics

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This paper extends the Biot theory of poroelasticity from the saturated to unsaturated case. The Biot phenomenological model uses parameters that are easily observable, such as the deformation of porous frame, total stress, pore pressure, and fluid specific discharge. Such model is preferred for engineering applications. At this macroscopic level, the extension of Biot theory from saturated to unsaturated is straightforward. The constitutive constants, however, are combined properties of solid, pore space, and fluids. In the unsaturated case, the constants are functions of the degree of saturation. Their measurements and tabulation over a range of saturation is generally not feasible for practical applications. In this work, a Biot-Willis type analysis is performed for the unsaturated case to provide a theory that the bulk material constants can be evaluated using laboratory measurable micromechanical constants under saturated condition, plus a capillary pressure curve (saturation versus suction pressure) typically available for unsaturated porous medium, without the need of measurement at each state of saturation. In particular, it is demonstrated that the surface energy contained in the meniscus interface manifests as a "capillary modulus," given by the negative inverse slope of the capillary pressure curve. A rigorous analysis based on the thermodynamic variational energy approach is also conducted to lend theoretical support to the phenomenological approach. The presented model can bring a closure to the practical engineering modeling of the deformation of partially saturated porous medium that lacks the information of material constants over the range of saturation.

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“…Cai and Ugai [9] combined the finite element strength reduction method with saturated-unsaturated seepage analysis to analyze the influence of different soil properties on the slope stability under rainfall. e rainfall infiltration of an unsaturated soil slope is a complicated hydromechanical coupling problem; in such cases, it is necessary to use advanced coupled hydromechanical constitutive models [15][16][17][18] for more accurate and reasonable analysis. Most of the existing research results are based on the effective stress principle of unsaturated soil, and ideal elastic-plastic theory is often used to calculate the deformation of unsaturated soil without considering the influence of saturation variation on its material properties and mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Unsaturated Soil Slopes under Rainfall Infiltration Based on the Modified Glasgow Coupled Model

Cai

Han

et al. 2020

Advances in Civil Engineering

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An ABAQUS UMAT subroutine was used for the secondary development of the established coupled hydromechanical constitutive model of unsaturated soil considering the effect of the microscopic pore structure. Combined with Euler’s backward implicit integration algorithm, a numerical program was established for simulating the proposed model. The developed numerical program was used to simulate the rainfall infiltration process of an actual slope engineering example, and the effects of rainfall intensity and rainfall duration on the pore pressure, fluid velocity, and displacement of the unsaturated soil slope were analyzed. The results show that the developed numerical program can reasonably analyze the changes in the seepage field and displacement field of unsaturated soil slopes under rainfall infiltration.

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A coupled hydro-mechanical constitutive model for unsaturated frictional and cohesive soil

Cited by 19 publications

References 38 publications

A Constitutive Model of Sandy Gravel Soil under Large‐Sized Loading/Unloading Triaxial Tests

A Constitutive Model of Sandy Gravel Soil under Large‐Sized Loading/Unloading Triaxial Tests

A linear constitutive model for unsaturated poroelasticity by micromechanical analysis

Numerical Analysis of Unsaturated Soil Slopes under Rainfall Infiltration Based on the Modified Glasgow Coupled Model

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