Semi-empirical elastic–thermoviscoplastic model for clay

Kurz, David; Sharma, Jitendra; Alfaro, Marolo C.; Graham, J.

doi:10.1139/cgj-2015-0598

Cited by 17 publications

(20 citation statements)

References 21 publications

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“…More recently, Coccia and McCartney presented a simple and effective constitutive model to consider the effects of time and temperature on the volume change of saturated and unsaturated soils using the concept of thermally accelerated secondary compression. Kurz et al developed an elastic‐thermoviscoplastic model by considering the impact of temperature on the creep rate coefficient, and the prediction using this model was in good agreement with the results from undrained tests for normally consolidated and lightly overconsolidated clays. Wang et al discovered an anisotropic thermal‐elastic‐plastic constitutive model for soft clay basing on the framework of the Modified Cam‐Clay model.…”

Section: Thermoplasticity Soil Modelmentioning

confidence: 80%

Similarity solution for cavity expansion in thermoplastic soil

Zhou

Kong

Liu

et al. 2017

Num Anal Meth Geomechanics

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This paper presents an analytical solution for cavity expansion in thermoplastic soil considering non-isothermal conditions. The constitutive relationship of thermoplasticity is described by Laloui's advanced and unified constitutive model for environmental geomechanical thermal effect (ACMEG-T), which is based on multi-mechanism plasticity and bounding surface theory. The problem is formulated by incorporating ACMEG-T into the theoretical framework of cavity expansion, yielding a series of partial differential equations (PDEs). Subsequently, the PDEs are transformed into a system of first-order ordinary differential equations (ODEs) using a similarity solution technique. Solutions to the response parameters of cavity expansion (stress, excess pore pressure, and displacement) can then be obtained by solving the ODEs numerically using mathematical software. The results suggest that soil temperature has a significant influence on the pressure-expansion relationships and distributions of stress and excess pore pressure around the cavity wall. The proposed solution quantifies the influence of temperature on cavity expansion for the first time and provides a theoretical framework for predicting thermoplastic soil behavior around the cavity wall. The solution found in this paper can be used as a theoretical tool that can potentially be employed in geotechnical engineering problems, such as thermal cone penetration tests, and nuclear waste disposal problems.

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Section: Thermoplasticity Soil Modelmentioning

confidence: 80%

Similarity solution for cavity expansion in thermoplastic soil

Zhou

Kong

Liu

et al. 2017

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

show abstract

“…The effect of the cooling rate on the shape of the contraction curve during cooling was noted by Sultan [161]. More recently, some research studies proposed the consideration of this relevant feature of soil behavior in order to properly reproduce non-isothermal behavior (e.g., [162][163][164]).…”

Section: Thermo-mechanical Interactions and Constitutive Modelingmentioning

confidence: 99%

“…This relation is based on the similarities observed between isothermal tests at different strain rates and tests at different temperatures at the same strain rate [179] (Figure 9a). A semi-empirical elastic-thermoviscoplastic model for clay was proposed recently by Kurz et al [162]. The plastic component includes viscous strains defined by a creep rate coefficient, which varies with plasticity index and temperature.…”

Section: Thermo-viscoelastoplastic Modelsmentioning

confidence: 99%

Reviewing the Modeling Aspects and Practices of Shallow Geothermal Energy Systems

et al. 2020

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Shallow geothermal energy systems (SGES) may take different forms and have recently taken considerable attention due to energy geo-structures (EGS) resulting from the integration of heat exchange elements in geotechnical structures. Still, there is a lack of systematic design guidelines of SGES. Hence, in order to contribute towards that direction, the current study aims at reviewing the available SGES modeling options along with their various aspects and practices. This is done by first presenting the main analytical and numerical models and methods related to the thermal behavior of SGES. Then, the most important supplementary factors affecting such modeling are discussed. These include: (i) the boundary conditions, in the form of temperature variation or heat flow, that majorly affect the predicted thermal behavior of SGES; (ii) the spatial dimensions that may be crucial when relaxing the infinite length assumption for short heat exchangers such as energy piles (EP); (iii) the determination of SGES parameters that may need employing specific techniques to overcome practical difficulties; (iv) a short-term vs. long-term analysis depending on the thermal storage characteristics of GHE of different sizes; (v) the influence of groundwater that can have a moderating effect on fluid temperatures in both heating and cooling modes. Subsequently, thermo-mechanical interactions modeling issues are addressed that may be crucial in EGS that exhibit a dual functioning of heat exchangers and structural elements. Finally, a quite lengthy overview of the main software tools related to thermal and thermo-hydro-mechanical analysis of SGES that may be useful for practical applications is given. A unified software package incorporating all related features of all SGES may be a future aim.

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“…However, because of mathematical difficulties the solutions of 3D models need finite element methods (FEM) and might not be applicable to some engineers. The theoretical model was originally developed by Taylor and Merchant (1940) and further studied by Gibson and Lo (1961) and other experts (Kurz et al, 2016;Yao & Fang, 2020). However, the material parameters used in the theoretical model could not be easily obtained from standard soil tests which hinders its application in engineering.…”

Section: Introductionmentioning

confidence: 99%

Experiments of creep rate for over-consolidated clay under plain strain condition and a simple correlation

et al. 2021

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Soft foundations of high embankments exhibit significant time-dependent effect on deformation in decades after construction, and there is a lack of simple method for predicting the creep rate of over-consolidated soft clay under plain strain condition. In this paper, laboratory creep tests under plain strain consolidation with different principal stress ratio were shown. The variation of stress in zero strain direction (σ y ) under different degree of consolidation was analysed. Linear relationship between (σ y ) and the applied principal stress σ x (or σ z ) was found. And then, the creep rate of volumetric strain (C α ) and vertical strain (β) were calculated and linked to volumetric stress defined ratio of over-consolidation (OCR p ) and stress ratio (K). Finally, the new parameter K•OCR p was found to have a good correlation with the creep rate (C α or β).

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Semi-empirical elastic–thermoviscoplastic model for clay

Cited by 17 publications

References 21 publications

Similarity solution for cavity expansion in thermoplastic soil

Similarity solution for cavity expansion in thermoplastic soil

Reviewing the Modeling Aspects and Practices of Shallow Geothermal Energy Systems

Experiments of creep rate for over-consolidated clay under plain strain condition and a simple correlation

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