超大次循环荷载下超固结黏土的长期不排水力学特性研究

韩剑; 姚仰平; 尹振宇

doi:10.11779/CJGE201712010

超大次循环荷载下超固结黏土的长期不排水力学特性研究 English Version

韩剑^1,3,
姚仰平¹,
尹振宇^2,3, ,

1. 北京航空航天大学交通科学与工程学院,北京 100191;
2. 同济大学地下建筑与工程系,岩土及地下工程教育部重点实验室,上海 200092;
3. 南特中央理工大学土木与力学工程研究所,南特法国 44300

基金项目: 国家自然科学基金项目（11672015,41372285,51579179）; 国家重点基础研究发展计划（“973”计划）项目（2014CB047001）

详细信息

作者简介:
韩剑(1986-), 男,湖北荆州人,博士, 主要从事岩土力学及本构关系方面的研究,E-mail: jianhan@buaa.edu.cn。

通讯作者:
尹振宇，E-mail：zhenyu.yin@gmail.com

中图分类号: TU431
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出版历程
- 收稿日期: 2016-08-31
- 发布日期: 2017-12-24

Long-term undrained mechanical behavior of overconsolidated clay under cyclic loading with a large number of cycles

1. School of Transportation Science and Engineering, Beihang University, Beijing 100191, China;
2. Department of Geotechnical Engineering, Key Laboratory of Geotechnical and Underground Engineering of Ministrey of Education, Tongji University, Shanghai 200092, China;
3. Ecole Centrale de Nantes, Research Institute of Civil and Mechanical Engineering, Nantes 44300, France

摘要

摘要: 风、波浪等荷载具有超大循环次数的特征,极大影响黏土的长期不排水动力特性,是黏土地基基础设计的关键问题之一。针对现有动力试验荷载循环次数不足的现状,以超固结度为4的重塑土试样为研究对象,开展了一系列不排水三轴动力试验,研究了在超大次（比如超过10⁶次）循环加载情况下黏土的相关特性。试验结果表明,在对称循环加载作用下,饱和黏土存在循环应力比门槛值为0.44~0.48。在循环加载初期,试样的轴应变及孔压的变化与前人对黏土动力试验研究结果一致。然而,随着循环加载次数的增加,动轴向应变减小,累积轴向应变增加;尤其是加载过程中由正孔压降低到负孔压。针对这一新的发现,增加了一个超固结土的蠕变试验结果进行了分析解释,为研究超大次循环荷载下超固结黏土的长期不排水力学特性的机理提供了新的思路。
- 黏土 /
- 超大循环次数 /
- 蠕变 /
- 孔隙水压力 /
- 不排水三轴试验
Abstract: The wave and wind loadings applyed on structure foundations with a large number of cycles affect the long-term undrained mechanical behavior of clay, which is one of key issues for the foundation design. Qwing to lack of cyclic tests with a large number of cycles up to now, laboratory tests on over consolidated clay are perfomed to study the cyclic behavior with a large number of cycles (e.g., more than one million). Based on the results of reconstituted specimens with OCR=4, the possible existence of the threshold stress ratio under the symmetric cyclic loading is confirmed. The value of the threshold stress ratio is 0.44~0.48. At the early stage of cyclic loading, the evolutions of axial strain and pore pressure are similar to the results of the conventional cyclic tests. However, as the number of cycles increases, the cyclic axial strain decreases, whereas the permanent axial strain increases and the pore pressure decreases from a positive to negative value. These new phenomena are analyzed by conducting additional creep tests on the overconsolidated clay, which throws new light on studying the mechanism governing the long-term undrained mechanical behavior of overconsolidated clay under cyclic loading with a large number of cycles.
- clay /
- a large number of cycles /
- creep /
- pore pressure /
- undrained triaxial test

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