兰州黄土侧限松弛特性试验研究

›› 2011, Vol. 32 ›› Issue (S1): 225-229.

兰州黄土侧限松弛特性试验研究

王松鹤，齐吉琳

中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室, 兰州 730000

收稿日期:2010-12-07 出版日期:2011-05-15 发布日期:2011-05-16
通讯作者: 齐吉琳，男，1969年生，研究员，博士生导师，主要从事寒区岩土工程方面的研究。Email：qijilin@lzb.ac.cn E-mail:wangsonghe@126.com
作者简介:王松鹤，男，1985年生，博士研究生，主要从事冻土力学与寒区工程等方面的研究工作
基金资助:
国家自然基金创新群体项目（No.40821001）；中国科学院百人计划“多年冻土地区路基变形和稳定性研究” 项目

Uniaxial relaxation characteristics of Lanzhou loess

WANG Song-he, QI Ji-lin

State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China

Received:2010-12-07 Online:2011-05-15 Published:2011-05-16

摘要/Abstract

摘要： 预变形过程可以认为是应力历史的作用，为了探明预变形对兰州黄土应力松弛特性的影响，开展了一系列室内侧限松弛试验，研究了不同预变形量条件下黄土的应力松弛过程曲线。试验结果表明：预变形量愈大，起始松弛应力愈大，在试验历时内的应力松弛量也较大。根据松弛曲线特征，提出松弛程度的概念，试验发现，预变形量愈大，达到同一松弛程度所需时间较短；随应力松弛进一步发展，这种时间差别愈明显。从试验出发，探讨了松弛过程的阶段性，将全过程分为瞬时松弛阶段、衰减松弛阶段和稳定松弛阶段3个阶段。预变形选择恒变形速率加载过程，研究了不同变形速率对松弛过程的影响。在分析松弛试验数据基础上，获得了一种能够描述卸载过程的流变关系，并对其可靠性进行了验证

关键词: 兰州黄土, 应力松弛, 预变形, 流变关系

Abstract: The pre-strain process can be considered to be the effect of stress history. To investigate the stress relaxation characteristics of Lanzhou loess, a series of laboratory stress relaxation tests under confined conditions are conducted. The relaxation curves of loess under different pre-strains are analyzed. The experimental results indicate that the initial relaxation stress increases with the growth of the magnitude of pre-strain, which ultimately leads to bigger instantaneous relaxation. According to the characteristics of relaxation curves, a new conception of relaxation degree (RD) is proposed. With the pre-strain gets bigger, the time to reach the same relaxation degree becomes shorter; and with the development of relaxation, this kind of difference tends to be more obvious. Based on the analysis of experimental data, the stages of relaxation are analyzed and the whole process can be divided into three stages, including instantaneous relaxation stage, attenuation relaxation stage and stable relaxation stage. The constant strain rate loading is chosen; and its influence on the relaxation process under different strain rates is analyzed. Based on the experimental results, a new rheological relation is obtained and its reliability is verified by the validation test.

Key words: Lanzhou loess, relaxation, pre-strain, rheological relation

中图分类号:

TU 432

王松鹤，齐吉琳. 兰州黄土侧限松弛特性试验研究[J]. , 2011, 32(S1): 225-229.

WANG Song-he, QI Ji-lin. Uniaxial relaxation characteristics of Lanzhou loess[J]. , 2011, 32(S1): 225-229.

参考文献

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