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Response of soil subjected to thermal cyclic loading: Experimental and constitutive study

机译：热循环荷载作用下土壤的响应：实验和本构研究

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The response of soil subjected to thermal cyclic loading plays an important role in certain engineering applications, such as high-level nuclear waste disposal, heat storage systems, CO2 sequestration plant and energy geostructures. For instance, energy geostructures impose temperature variations that are daily and seasonally cyclic to the soil and might have consequences of engineering relevancy, mainly in terms of foundation displacements. This paper aims to experimentally investigate the response of a natural silty clay soil to thermal cyclic loading in drained conditions. The experimental programme includes: (i) oedometric tests at various constant temperatures aimed at studying the sensibility of the material to temperature and (ii) thermal cyclic tests under constant vertical effective stress in oedometric conditions, with temperature ranging between 5 and 60 degrees C. As expected, the silty clay tested under normal consolidation conditions (NC) undergoes thermoplasticity, and the results indicate that most of the irreversible deformation occurs during the first heating cooling cycle, exhibiting an accommodative behaviour during the subsequent cycles. In other words, increments of irreversible deformation are observed in the thermal cycles successive to the first one, which generally become smaller and smaller cycle after cycle until stabilisation. In the end, the material tends to remain inside the elastic domain, exhibiting thermo-elastic expansion and contraction during heating and cooling. In the second part of the paper, an extension of an existing thermoelastic-thermoplastic constitutive model that aims to tackle the accommodative response is proposed. The extended model is able to reproduce the accommodation phenomenon thanks to an additional parameter called the cydic plastic radius. The experimental results obtained are innovative in clarifying the response of soils subjected to drained thermal cyclic loading, and the constitutive model presented allows this aspect to be considered in the numerical analysis of the engineering applications where it is of concern. (C) 2015 Elsevier B.V. All rights reserved.
机译：承受热循环载荷的土壤的响应在某些工程应用中起着重要作用，例如高级核废料处理，储热系统，CO 2固存装置和能源地质结构。例如，能源地质结构会施加温度变化，该温度变化每天对土壤周期性变化，并且可能对工程产生影响，主要是在地基位移方面。本文旨在通过实验研究排水条件下天然粉质粘土对热循环荷载的响应。实验程序包括：（i）在各种恒温条件下的测压测试，旨在研究材料对温度的敏感性;以及（ii）在测温条件下，温度范围为5至60摄氏度的恒定垂直有效应力下的热循环测试。正如预期的那样，在正常固结条件（NC）下测试的粉质粘土经历了热塑性，结果表明大多数不可逆变形发生在第一个加热冷却循环中，在随后的循环中表现出适应性。换句话说，在与第一个相继的热循环中观察到不可逆变形的增加，通常在循环后直至稳定为止，循环逐渐变小。最后，材料倾向于保留在弹性区域内，在加热和冷却过程中表现出热弹性膨胀和收缩。在本文的第二部分中，提出了旨在解决适应性响应的现有热弹-热塑性本构模型的扩展。扩展模型能够通过附加的称为循环塑性半径的参数来再现调节现象。获得的实验结果在阐明受热循环荷载作用下的土壤的响应方面具有创新性，所提出的本构模型使这一方面可以在关注工程应用的数值分析中加以考虑。 （C）2015 Elsevier B.V.保留所有权利。

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