热-力耦合作用下黏性土体积变形特性试验研究

费康; 戴迪; 付长郓

doi:10.11779/CJGE201909021

热-力耦合作用下黏性土体积变形特性试验研究 English Version

扬州大学岩土工程研究所,江苏扬州 225127

基金项目: 国家自然科学基金项目（51778557）; 江苏省“青蓝工程” 项目（苏教师[2016]15号）

详细信息

作者简介:
费康(1978— ),男,博士,教授,主要从事地基基础等方面的教学和科研工作。E-mail: kfei@yzu.edu.cn。

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出版历程
- 收稿日期: 2018-10-29
- 发布日期: 2019-09-24

Experimental study on volume change behavior of clay subjected to thermo-mechanical loads

Institute of Geotechnical Engineering, Yangzhou University, Yangzhou 225127, China

摘要

摘要: 采用温控三轴仪,对饱和黏性土在热-力耦合作用下的体积变形特性进行了研究。试验中共考虑了温度循环后的应力加卸载试验、升高或降低不同温度后的应力加卸载试验3种方案。结果表明,黏性土温度体积变形的大小与围压无关。温度循环会造成黏性土塑性体积变形持续发展,但单周塑性应变增量随温度循环周数的增加而减小,体现了温度历史的影响。将土样继续加载后,温度的历史效应将被覆盖,后续温度循环中产生的塑性体积应变量值及发展规律与初始循环下的类似。不同温度下土体的压缩指数和回弹指数基本不变。同一塑性体积应变下,屈服应力随温度的增加而减小。温度变化引起的塑性体积应变也会造成屈服应力提高,可近似采用与力学塑性体积应变硬化一致的规律进行描述。
- 黏性土 /
- 室内试验 /
- 热-力耦合作用 /
- 塑性体积应变 /
- 屈服应力
Abstract: The volume change behavior of a saturated clay subjected to thermos-mechanical loads is investigated by temperature-controlled triaxial tests. A total of three test series are carried out: mechanical loading-unloading test after thermal cycles, mechanical loading-unloading test after heating or cooling to different temperatures. The experimental results show that for the tested clay, the thermally induced irreversible compression strain is accumulated with the number of thermal cycles at a decreasing rate. This temperature history effect can be erased by the mechanical loading. After loading to a new normally consolidated state, the magnitude and the trend of the plastic volumetric strain are similar to those under the initial thermal cycles. The compression and the swelling index are nearly constant at different temperatures. The yield stress at constant plastic volumetric strain decreases with the increasing temperature. The plastic volumetric strain induced by heating has the similar effect on the yield stress as that generated by the mechanical loading, and a unified hardening rule can be used.
- clay /
- laboratory test /
- thermo-mechanical load /
- plastic volumetric strain /
- yield stress

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参考文献(21)

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