Effect of Drained Heating and Cooling on the Preconsolidation Stress of Saturated Normally Consolidated Clays
Effect of Drained Heating and Cooling on the Preconsolidation Stress of Saturated Normally Consolidated Clays
复制标题
排水加热和冷却对饱和常固结粘土预固结应力的影响
DOI：
10.1061/9780784482780.061
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
McCartney, John S.
中科院分区：
文献类型：
--
作者：
Samarakoon, Radhavi A.;McCartney, John S.
从理解不同类型的能源地质结构以及理解利用热量改善土壤的角度来看，饱和粘土在加热/冷却循环过程中的热机械行为是相关的。本文涉及加热/冷却循环对饱和正常固结粘土的预固结应力的影响的研究。尽管许多研究观察到超固结土加热后预固结应力（热软化）有所下降，但很少有研究调查正常固结土的预固结应力的变化。现有的热弹塑性模型表明，加热-冷却循环将导致热收缩，并对正常固结的土壤产生明显的超固结效应（热硬化），但已观察到文献中的不一致之处。这项研究涉及使用热三轴单元首先将高岭石粘土固结到正常固结条件，应用排水加热或加热/冷却循环，然后通过机械加载达到更高的平均有效应力。本研究中提出的测试证实，冷却还会对最初正常固结的粘土产生明显的超固结效应，但预固结应力大于加热前初始原始固结线的预期应力。该结果是关于可能使用热量来改善软粘土的机械响应的积极发现。
The thermo-mechanical behavior of saturated clays during a heating/cooling cycle is relevant from the perspective of understanding different types of energy geostructures as well as understanding the use of heat for soil improvement. This paper involves a study of the effect of a heating/cooling cycle on the preconsolidation stress of saturated normally consolidated clays. Although many studies have observed a decrease in preconsolidation stress (thermal softening) after heating of overconsolidated soils, fewer studies have investigated changes in preconsolidation stress of normally consolidated soils. Available thermo-elasto-plastic models indicate that a heating-cooling cycle will lead to thermal contraction and an apparent overconsolidation effect for normally consolidated soils (thermal hardening), but inconsistencies in the literature have been observed. This study involves the use of a thermal triaxial cell to first consolidate kaolinite clay to normally consolidated conditions, apply a drained heating or a heating/cooling cycle, followed by mechanical loading to higher mean effective stresses. The tests presented in this study confirm that cooling also induces an apparent overconsolidation effect on the initially normally consolidated clay, but with a preconsolidation stress greater than that expected from the initial virgin consolidation line before heating. The results are a positive finding regarding the possible use of heat to improve the mechanical response of soft clays.
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影响因子：
5.2
作者：
F. Finn
通讯作者：
F. Finn
排水加热和冷却对常固结粘土不排水抗剪强度的影响
DOI：
10.1007/978-3-319-99670-7_31
发表时间：
2018
期刊：
Springer Series in Geomechanics and Geoengineering
影响因子：
--
作者：
R. Samarakoon;I. Ghaaowd;J. McCartney
通讯作者：
J. McCartney
影响因子：
--
作者：
A. Takai;I. Ghaaowd;J. McCartney;T. Katsumi
通讯作者：
T. Katsumi
影响因子：
1.6
作者：
D. Burmister
通讯作者：
D. Burmister