Thermomechanical Constitutive Model for Saturated Clays Based on Critical State Theory

Hamidi, Amir; Tourchi, Saeed; Khazaei, Cyrus

doi:10.1061/(asce)gm.1943-5622.0000402

Cited by 35 publications

(31 citation statements)

References 39 publications

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“…The simple introduction of Bishop's stress in the model proposed by Hamidi et al (2015) allowed volume changes induced by suction to be considered, but the predictions obtained were not always in accordance with experimental observations. In particular, dependency of soil compressibility to suction was not properly reproduced.…”

Section: Adaptation Of the Model To Unsaturated Statecontrasting

confidence: 36%

“…In this study, it is shown that a proper enhancement of the model developed by Hamidi et al (2015) makes it possible to overcome these drawbacks, and the experimentally observed behavior can be reproduced. Therefore, theoretical predictions of the enhanced model along different stress paths are presented in comparison with experimental observations.…”

Section: Adaptation Of the Model To Unsaturated Statementioning

confidence: 85%

“…Using a similar approach, an isothermal constitutive model is presented for predicting the thermo-elastoplastic behavior of unsaturated clays in triaxial stress space. This model is an extension of the thermoelastoplastic model for fully saturated clays proposed by Hamidi et al (2015). Using a non-associated temperature dependent flow rule, the present model can simulate the mechanical behavior of clays with respect to temperature and suction changes.…”

Section: Introductionmentioning

confidence: 98%

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Thermo-mechanical constitutive modeling of unsaturated clays based on the critical state concepts

Tourchi

Hamidi

2015

Journal of Rock Mechanics and Geotechnical Engineering

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a b s t r a c tA thermo-mechanical constitutive model for unsaturated clays is constructed based on the existing model for saturated clays originally proposed by the authors. The saturated clays model was formulated in the framework of critical state soil mechanics and modified Cam-clay model. The existing model has been generalized to simulate the experimentally observed behavior of unsaturated clays by introducing Bishop's stress and suction as independent stress parameters and modifying the hardening rule and yield criterion to take into account the role of suction. Also, according to previous studies, an increase in temperature causes a reduction in specific volume. A reduction in suction (wetting) for a given confining stress may induce an irreversible volumetric compression (collapse). Thus an increase in suction (drying) raises a specific volume i.e. the movement of normal consolidation line (NCL) to higher values of void ratio. However, some experimental data confirm the assumption that this reduction is dependent on the stress level of soil element. A generalized approach considering the effect of stress level on the magnitude of clays thermal dependency in compression plane is proposed in this study. The number of modeling parameters is kept to a minimum, and they all have clear physical interpretations, to facilitate the usefulness of model for practical applications. A step-by-step procedure used for parameter calibration is also described. The model is finally evaluated using a comprehensive set of experimental data for the thermo-mechanical behavior of unsaturated soils.

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Section: Adaptation Of the Model To Unsaturated Statecontrasting

confidence: 36%

Section: Adaptation Of the Model To Unsaturated Statementioning

confidence: 85%

Section: Introductionmentioning

confidence: 98%

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Thermo-mechanical constitutive modeling of unsaturated clays based on the critical state concepts

Tourchi

Hamidi

2015

Journal of Rock Mechanics and Geotechnical Engineering

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“…1(b). This type of yield surface is the most widely utilized approach to model the thermal volume change of saturated soils [1,17,21,26,28] and unsaturated soils [13,15,16,38]. Incorporation of a thermal softening mechanism into the pre-existing LC surface permits the transition from thermo-elastic expansion to thermo-elasto-plastic contraction to be captured for an overconsolidated soil at constant mean effective stress.…”

Section: Introductionmentioning

confidence: 99%

Thermal volume change of poorly draining soils II: Model development and experimental validation

Coccia

McCartney

2016

Computers and Geotechnics

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a b s t r a c tThis study presents the development of an alternative constitutive model for predicting the thermal volume change of saturated and unsaturated soils using the concept of thermally-accelerated secondary compression. The model requires observation of the secondary compression response prior to drained heating to estimate the coefficient of secondary compression. The model was found to successfully capture the trends in thermal volume change arising from accelerated secondary compression resulting from prior mechanical loading for unsaturated, compacted Bonny silt. The model was also used successfully to represent data from the literature for normally consolidated and heavily overconsolidated soils prepared with different loading paths.

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“…Graham et al (2001) revised the Cam-clay model to consider the effects of temperature on the volume changes, pore water pressures and shear strengths for both normally consolidated and overconsolidated clays. Hamidi et al (2014) used the relationships of the isotropic compression curves for saturated clays at various temperatures to find a new thermal-elastic-plastic mechanical model incorporating the stress history influence.…”

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confidence: 99%

Non-linear elastic model incorporating temperature effects

LiuHong

LiuHanlong

Xiao

et al. 2018

Geotechnical Research

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The objective of this paper is to present a non-linear elastic model, considering temperature effects, that engineers can readily use to predict the mechanical behaviours of soils in geotechnical applications. Instead of using hyperbolic and exponential models, a non-linear equation is first formatted to describe the tangent moduli for saturated clays by introducing only one additional parameter (i.e. p ). By extending the non-linear equation, a new simplified nonlinear elastic model is obtained that is capable of capturing well the stress-strain relationship of saturated clays at room temperature. Thereafter, based on experimental results, the relationships between cohesion, internal friction angle, index, tangent bulk modulus and temperature are developed and incorporated in the non-linear elastic model. A revised semi-regression method is also developed to determine the relationship between the additional model parameter p and temperature. In this model, all of the eight parameters for the model have clear physical meanings and could be readily obtained by performing temperature-controlled triaxial tests. The accuracy and general applicability of the proposed method was checked by comparing its predictions with experimental results on saturated clay under various stress-path and temperature conditions as well as existing solutions proposed elsewhere. et al., 1989;Rao et al., 2017;Sun et al., 2011), energy piles (Abdelaziz and Ozudogru, 2016;Knellwolf et al., 2011;Saggu and Chakraborty, 2016) and geothermal structures (Brandl, 2006), highway pavements (Bianchini et al., 2011;Kertesz and Sansalone, 2014), thermally active embankments (Coccia and McCartney, 2013) and thermally active retaining walls (Stewart et al., 2014).The volume change for saturated soils performs a transition from contractive to expansive behaviour during drained heating or the temperature cycle with increasing overconsolidation ratio (O CR ) (Abuel-Naga et al., 2006;Baldi et al., 1988;Cekerevac and Laloui, 2004;Romero et al., 2005) or relative density (Ng et al., 2016). Some experimental test results showed that the shear strength of saturated clays under both drained and undrained conditions would increase with increase in temperature (Abuel- However, most of these temperature-dependent constitutive models mentioned previously are based on the elasto-plastic Camclay or modified Cam-clay model in the critical state framework. These models often include a number of parameters which may not have physical meanings or that have values difficult to determine due to the complicated soil properties, particularly considering the effects of temperature. Compared with these elastic-plastic models, it is easier to understand the theory of nonlinear elastic models, and the parameters could also be easily determined by performing triaxial compression tests Chang, 2006, 2008). In addition, the non-linear elastic models (e.g. Duncan-Chang model) could be readily implemented in finite-element analysis software without a singular matrix (Chen and Liu, ...

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Thermomechanical Constitutive Model for Saturated Clays Based on Critical State Theory

Cited by 35 publications

References 39 publications

Thermo-mechanical constitutive modeling of unsaturated clays based on the critical state concepts

Thermo-mechanical constitutive modeling of unsaturated clays based on the critical state concepts

Thermal volume change of poorly draining soils II: Model development and experimental validation

Non-linear elastic model incorporating temperature effects

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