A New One-Dimensional Thermal Elastic-Viscoplastic Model for the Thermal Creep of Saturated Clayey Soils
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 149, Issue 4
Abstract
Temperature significantly affects the mechanical properties of geomaterials, particularly the creep behavior of soft clayey soils. Thus, an appropriate constitutive model to describe the time-dependent stress-strain behavior of clayey soils at various temperatures is necessary. This study performed temperature-controlled oedometer tests on two clayey soils: Hong Kong marine deposit (HKMD) and kaolinite clay (kaolin). The thermally-induced strain and creep strain rates under different temperature paths were investigated and discussed. A novel one-dimensional (1D) thermal elastic viscoplastic (TEVP) model was developed based on an existing 1D elasto viscoplastic (EVP) model. In the proposed model, the viscoplastic strain rate of soils can be described using three state variables: effective stress, strain, and temperature. The proposed model can be conveniently implemented in creep analysis with the equivalent time concept. The prediction results of the TEVP model were consistent with the experimental data for HKMD and kaolin.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The work in this paper is supported by a Research Impact Fund (RIF) Project (R5037-18) and GRF Projects (15217918, 15213019, 15210020, 15210322) from the Research Grants Council (RGC) of the Hong Kong Special Administrative Region Government of China. The authors also acknowledge the financial support from the Research Institute for Sustainable Urban Development of The Hong Kong Polytechnic University and grants (ZDBS, BD8U) from The Hong Kong Polytechnic University.
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Journal of Geotechnical and Geoenvironmental Engineering
Volume 149 • Issue 4 • April 2023
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© 2023 American Society of Civil Engineers.
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Received: Jun 22, 2021
Accepted: Nov 7, 2022
Published online: Jan 23, 2023
Published in print: Apr 1, 2023
Discussion open until: Jun 23, 2023
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Cited by
- Ze-Jian Chen, Run-Dong Zhao, Wen-Bo Chen, Pei-Chen Wu, Jian-Hua Yin, Wei-Qiang Feng, Effects of temperature on the time-dependent compression and shear behaviour of a soft marine clayey soil, Engineering Geology, 10.1016/j.enggeo.2023.107005, 314, (107005), (2023).