A double hardening thermo-mechanical constitutive model for overconsolidated clays

Liu, E.; Xing, Huilin

doi:10.1007/s11440-008-0053-4

Cited by 36 publications

(11 citation statements)

References 16 publications

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“…In order to model the mechanical features of loess under simulated acid rain conditions, the double hardening model is adopted (Shen, 1995;Liu and Xing, 2009), which can be revised to reflect both strain hardening phenomenon and strain softening phenomenon of the soil. For triaxial compression, we have = ( 23…”

Section: Simulation Of Triaxial Compression Testsmentioning

confidence: 99%

Mechanical Behavior and Constitutive Model for Loess Samples under Simulated Acid Rain Conditions

Liu

et al. 2021

Preprint

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In this paper, the sulfuric acid solution is diluted to pH 5.0, 4.0 and 3.0 to simulate the acid rain condition, and the triaxial compressional tests and scanning electron microscope are carried out to study the mechanical properties and evolution of the microstructure of the saturated loess samples. The results demonstrate that acid rain increases the porosity of loess samples, and the pore distribution is not uniform, so that the mechanical properties of loess samples change. With the decrease of pH value, the peak value of the deviatoric stress and the volumetric contraction of loess samples decreases, which causes the strength of soil to decrease. Furthermore, the framework of the chemical-mechanical model for loess under the action of acid rain is established, in which the loess is considered as porous medium material, and the variable of acid rain at different pH values through the degree of chemical reaction is taken into account in the double-hardening model, and the model is also verified by the triaxial test results finally.

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Section: Simulation Of Triaxial Compression Testsmentioning

confidence: 99%

Mechanical Behavior and Constitutive Model for Loess Samples under Simulated Acid Rain Conditions

Liu

et al. 2021

Preprint

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“…Regardless of the influence of temperature, the double-hardening elastoplastic model for saturated soils [39] was used to describe the mechanical features of the soil skeleton of unsaturated soils.…”

Section: Double-hardening Model For Soil Skeletonmentioning

confidence: 99%

Numerical Analysis of the Effects of Crack Characteristics on the Stress and Deformation of Unsaturated Soil Slopes

Yang¹,

Liu²

2020

Water

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Cracks induced by evaporation or rainfall have a great influence on the stability of unsaturated soil slopes, which can lead to landslides during the rainfall process. In order to study the effect of crack characteristics on the evolution of stress and deformation of unsaturated soil slopes, a series of numerical analyses under different conditions were performed using a coupled elastoplastic finite element program that we developed for unsaturated soil. When carrying out the numerical analyses, the effective stress for unsaturated soil proposed by Bishop and an elastoplastic double-hardening constitutive model for the soil skeleton were employed. The varying parameters, including the crack location, the discharge speed, evaporation rate, infiltration rate, and tensile strength, were investigated to study the coupling process of pore water pressure and deformation in the process of evaporation and rainfall infiltration. The numerical results showed that the minimum pore water pressure of the soil slope at the end of evaporation/rainfall decreased gradually and the crack width increased gradually as the crack set closer to the slope; the larger the discharge speed of pore air, the greater the crack width. With the increase in the evaporation rate, the pore water pressure of the soil slope reduced and the crack initiated earlier and became wider. As the infiltration rate increased, the pore water pressure of the soil slope and the crack width increased, but the decreasing duration became shorter. The change of tensile strength had little effect on the pore water pressure, but the development of the crack width changed with evaporation and rainfall infiltration.

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“…However, it has been found that the thermoplastic deformation at overconsolidated states cannot be well described. To tackle this issue, many subsequent models within the same framework were developed by introducing an additional thermal yield (TY) surface (Abuel-Naga et al 2007a;Cui et al 2000;Hong et al 2016), the bounding surface concept (Laloui and Cekerevac 2003;Laloui and François 2009;Robinet et al 1996;Zhou and Ng 2015), sub-loading surface theory (Yao and Zhou 2013), double hardening mechanism (Liu and Xing 2009), or approximate relationships between the thermally induced plastic strain and OCR (Graham et al 2001). In addition, as the conventional Cam-clay type yield functions tend to significantly overestimate failure stresses on the "dry" side, the Hvorslev surface is often used at the overconsolidated states under both isothermal and non-isothermal conditions (Graham et al 2001;Yao and Zhou 2013).…”

Section: Aq1mentioning

confidence: 99%

State parameter–based thermomechanical constitutive model for saturated fine-grained soils

et al. 2020

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This paper presents a two-surface constitutive model for describing thermomechanical behaviour of saturated fine-grained soils at both normally consolidated and overconsolidated states. A thermal-dependent stress ratio-state parameter relation is adopted to account for the effects of temperature on the shape of the state boundary surface (SBS) of soils. In the model, both the size and the shape of the SBS are allowed to vary with temperature, which is evidenced by thermal variation of the mechanical yield loci and the shifts of the normal consolidation line (NCL) and the critical state line (CSL) upon heating and/or cooling. A thermal yield surface is added for modelling the isotropic thermal deformation of soils more accurately, in particular at overconsolidated states. The mechanical and thermal yield mechanisms are coupled by the temperature-dependent preconsolidation pressure which is controlled by a volumetric hardening law. Based on experimental observations, a nonlinear relationship between the spacing ratio and temperature changes is defined and a simple thermal dependent non-associated flow rule is proposed. The model is validated against some selected experimental results of several soils tested under various mechanical and thermal paths such as drained isotropic heating and cooling, drained and undrained triaxial compression at non-isothermal conditions.

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A double hardening thermo-mechanical constitutive model for overconsolidated clays

Cited by 36 publications

References 16 publications

Mechanical Behavior and Constitutive Model for Loess Samples under Simulated Acid Rain Conditions

Mechanical Behavior and Constitutive Model for Loess Samples under Simulated Acid Rain Conditions

Numerical Analysis of the Effects of Crack Characteristics on the Stress and Deformation of Unsaturated Soil Slopes

State parameter–based thermomechanical constitutive model for saturated fine-grained soils

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