A thermoplastic clay constitutive model with temperature dependent evolution of stress anisotropy

IF 3.3 2区工程技术 Q3 ENERGY & FUELS Geomechanics for Energy and the Environment Pub Date : 2024-06-01 DOI:10.1016/j.gete.2024.100568

Irfan Ahmad Shah , Abhishek Ghosh Dastider , Prasenjit Basu , Santiram Chatterjee

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Abstract

This paper presents a thermomechanical constitutive model that captures temperature dependent evolutions of preconsolidation stress and stress anisotropy in normally consolidated and lightly overconsolidated saturated clays. Following a non-associative flow rule, the model was formulated to account for the rate of evolution of stress anisotropy as a function of temperature. A temperature-dependent rotational hardening parameter was introduced and calibrated employing a simple optimization algorithm for four different clays. The developed model was further implemented in a finite element (FE) analysis software for use in boundary value problems. Success of such numerical implementation and predictive performance of the constitutive model was further verified through FE simulations of drained and undrained triaxial tests on saturated clays at reference and elevated temperature. FEA results obtained from these simulations agreed very well with test data reported in the literature.

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应力各向异性随温度变化的热塑性粘土构造模型

本文介绍了一种热力学构造模型，该模型可捕捉正常固结和轻度过固结饱和粘土中随温度变化的预固结应力和应力各向异性。该模型采用非耦合流动规则，考虑了应力各向异性随温度变化的速率。引入了与温度相关的旋转硬化参数，并采用简单的优化算法对四种不同粘土进行了校准。通过在参考温度和高温条件下对饱和粘土进行排水和不排水三轴试验的有限元模拟，进一步验证了这种数值实施的成功性以及构成模型的预测性能。这些模拟获得的有限元分析结果与文献中报告的测试数据非常吻合。

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来源期刊

Geomechanics for Energy and the Environment Earth and Planetary Sciences-Geotechnical Engineering and Engineering Geology

CiteScore

5.90

自引率

11.80%

发文量

期刊介绍： The aim of the Journal is to publish research results of the highest quality and of lasting importance on the subject of geomechanics, with the focus on applications to geological energy production and storage, and the interaction of soils and rocks with the natural and engineered environment. Special attention is given to concepts and developments of new energy geotechnologies that comprise intrinsic mechanisms protecting the environment against a potential engineering induced damage, hence warranting sustainable usage of energy resources. The scope of the journal is broad, including fundamental concepts in geomechanics and mechanics of porous media, the experiments and analysis of novel phenomena and applications. Of special interest are issues resulting from coupling of particular physics, chemistry and biology of external forcings, as well as of pore fluid/gas and minerals to the solid mechanics of the medium skeleton and pore fluid mechanics. The multi-scale and inter-scale interactions between the phenomena and the behavior representations are also of particular interest. Contributions to general theoretical approach to these issues, but of potential reference to geomechanics in its context of energy and the environment are also most welcome.