A new bounding surface model for thermal cyclic behaviour

Zhou, Chao; Fong, Kin Yew; Ng, Charles Wang Wai

doi:10.1002/nag.2688

Cited by 29 publications

(12 citation statements)

References 16 publications

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“…To capture the thermo-plasticity under cyclic thermal loading, the memory surface is introduced in addition to loading and bounding surfaces [65] as shown in Figure 1. It is assumed to have the same shape as the bounding surface, and its size is controlled by the memory pressure 𝑝 𝑚 , which records the maximum stress state of soil.…”

Section: State-dependent Variables In Compliance Matrixmentioning

confidence: 99%

Effects of thermal cycles on soil behaviour: theoretical and experimental studies

Zhou

Zhang

et al. 2023

E3S Web of Conf.

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Fundamental understanding and proper modelling of soil behaviour under thermal cycles are increasingly important and essential for the analysis and design of many emerging infrastructures, such as geothermal structures and embankment-atmosphere interactions under a changing climate. Previous studies mainly focus on monotonic thermal loading of thermo-mechanical behaviour of soils. Based on a unified, state-dependent theoretical framework in the form of compliance matrix, a new constitutive model is developed to simulate the cyclic thermo-mechanical behaviour of saturated and unsaturated soils. This new bounding surface model is formulated in terms of Bishop’s stress and suction. Apart from the loading and bounding surfaces, a memory surface is incorporated in the model to simulate cyclic thermal behaviour of soils. To verify the new model, computed results are compared with measured data from cyclic heating-cooling tests on saturated and unsaturated soils at various suctions. Based on this new model, two engineering applications are analysed including cyclic thermally loaded floating energy pile foundations and a deep excavation in the unsaturated ground. Consistent results are obtained between computed and measured data.

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Section: State-dependent Variables In Compliance Matrixmentioning

confidence: 99%

Effects of thermal cycles on soil behaviour: theoretical and experimental studies

Zhou

Zhang

et al. 2023

E3S Web of Conf.

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“…After the description of the proposed model extended to thermal cyclic behavior, it is essential to discuss the rationale of ACC2-T model in terms of elasto-plastic theory and thermodynamic theory as Hong et al [22] did on three existing thermo-mechanical models [19,20,25,28,29]. The verification of loading path independence is made up by both the thermo-elastic and thermo-plastic part.…”

Section: Loading Path Independencementioning

confidence: 99%

“…All those observations show that multiple thermal cycles should be considered in thermal mechanical modeling of clays. Zhou et al [28] recently proposed a bounding surface model with a memory surface to consider the thermal cyclic behavior. However, this imposed memory surface actually has no effect on the accumulation behavior of normally consolidated soil because this memory surface coincides with the bounding surface in this circumstance.…”

Section: Introductionmentioning

confidence: 99%

A two-surface thermomechanical plasticity model considering thermal cyclic behavior

et al. 2020

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In thermal-related engineering such as thermal energy structures and nuclear waste disposal, it is essential to well understand volume change and excess pore water pressure buildup of soils under thermal cycles. However, most existing thermomechanical models can merely simulate one heating-cooling cycle and fail in capturing accumulation phenomenon due to multiple thermal cycles. In this study, a two surface elasto-plastic model considering thermal cyclic behavior is proposed. This model is based on the bounding surface plasticity and progressive plasticity by introducing two yield surfaces and two loading yield limits. A dependency law is proposed by linking two loading yield limits with a thermal accumulation parameter nc, allowing the thermal cyclic behavior to be taken into account. Parameter nc controls the evolution rate of the inner loading yield limit approaching the loading yield limit following a thermal loading path. By extending the thermo-hydro-mechanical equations into the elastic-plastic state, the excess pore water pressure buildup of soil due to thermal cycles is also accounted. Then, thermal cycle tests on four fine-grained soils (natural Boom clay, Geneva clay, Bonny silt and reconstituted Pontida clay) under different OCRs and stresses are simulated and compared. The results show that the proposed model can well describe both strain accumulation phenomenon and excess pore water pressure buildup of finegrained soils under the effect of thermal cycles.

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“…In fact, adopting similar assumptions, most subsequent models are based on the same principle (Robinet et al, 1996;Modaressi and Laloui, 1997;Cui et al, 2000;Graham et al, 2001;Abuel-Naga et al, 2009;Laloui and François, 2009;Yao, Y. and Zhou;Di Donna and Laloui, 2015;Hamidi et al, 2015;Tourchi and Hamidi, 2015;Zhou C and Ng CW., 2015;Hamidi et al, 2017;Hamidi and Tourchi, 2018;Maranha et al, 2018). In the meantime, the concept of bounding surface plasticity has also been extended to improve the modelling of cyclic behaviour at various temperatures and volume change under thermal loading at intermediately and highly overconsolidated states (Modaressi and Laloui, 1997;Laloui and Cekerevac, 2008;Laloui and François, 2009;Di Donna and Laloui, 2015;Zhou et al, 2017;Zhou and Ng, 2018;Cheng et al, 2020;Golchin et al, 2022a,b).…”

Section: Introductionmentioning

confidence: 99%

A thermomechanical model for argillaceous hard soils - weak rocks: application to THM simulation of deep excavations in claystone

Tourchi¹,

Malcom²,

Vaunat³

et al. 2023

Preprint

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The paper presents the enhancement of an existing constitutive model for argillaceoushard soils-weak rocks for non-isothermal conditions, to be used in coupledthermo-hydro-mechanical (THM) simulations of underground excavations subjected totemperature variations within the context of deep geological nuclear waste disposal. Theproposed thermo-elastoplastic extension accounts for the effect of temperature on theyield and plastic potential functions, and on the elastic stiffness. The resulting modelis validated through the simulation of relevant non-isothermal laboratory tests reportedin the literature. The model is then applied to the coupled THM simulation of an insitu heating test conducted at the Meuse/Haute-Marne underground research laboratory,in Bure, France, excavated in the Callovo-Oxfordian claystone. Results show that theincorporation of thermal effects into the constitutive description of the host rock playsa significant role in the behaviour of the excavation when subjected to thermal loading,particularly in the evolution of the excavation damaged zone.

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A new bounding surface model for thermal cyclic behaviour

Cited by 29 publications

References 16 publications

Effects of thermal cycles on soil behaviour: theoretical and experimental studies

Effects of thermal cycles on soil behaviour: theoretical and experimental studies

A two-surface thermomechanical plasticity model considering thermal cyclic behavior

A thermomechanical model for argillaceous hard soils - weak rocks: application to THM simulation of deep excavations in claystone

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