Volume change behaviour of saturated clays under drained heating conditions: experimental results and constitutive modeling
Volume change behaviour of saturated clays under drained heating conditions: experimental results and constitutive modeling
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DOI：
10.1139/t07-031
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发表时间：
2007-09
影响因子：
3.6
通讯作者：
H. Abuel-Naga;D. Bergado;A. Bouazza;G. Ramana
中科院分区：
文献类型：
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作者：
H. Abuel-Naga;D. Bergado;A. Bouazza;G. Ramana
饱和细粒土的热力学行为的基本特征之一是在排水加热条件下发生的热诱导体积变化。在这项研究中，使用了一种能够处理高达100°C温度的改进的测温仪来研究软曼谷粘土的热诱导体积变化行为。本实验研究的结果提供了额外的实验证据和见解，可以增强对高温下饱和粘土体积变化行为的理解。本文还介绍了一个各向同性热弹塑性本构模型，该模型可以很好地预测饱和粘土试样在20-95℃范围内正常固结和卸载过程中获得的超固结条件下的热致体积变化行为。两个屈服极限，即加载屈服极限和热屈服极限，每一个都可以从简单的实验结果中测量出来。
One of the essential features of thermomechanical behaviour of saturated fine-grained soils is the thermally induced volume change occurring under a drained heating condition. In this study, a modified oedometer apparatus, able to handle temperatures up to 100 °C, was used to investigate the thermally induced volume change behaviour of soft Bangkok clay. The results of this experimental study provide additional experimental evidence and insights that may enhance the understanding of volume change behaviour of saturated clays at elevated temperatures. This paper also introduces an isotropic thermoelastoplastic constitutive model that closely predicts the thermally induced volume change behaviour of saturated clay specimens under normally consolidated conditions as well as overconsolidated conditions obtained by unloading process in the temperature range of 20–95 °C. Two yield limits, namely: loading yield limit and thermal yield limit, each of which can be measured from simple experimental results, are pro...