›› 2018, Vol. 39 ›› Issue (8): 2895-2904.doi: 10.16285/j.rsm.2017.0048

• 基础理论与实验研究 • 上一篇    下一篇

干湿-冻融循环下延吉膨胀岩的力学特性及其应力-应变归一化

曾志雄1, 2,孔令伟1, 2,李晶晶1, 2,李聚昭1, 2   

  1. 1.中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室,湖北 武汉 430071;2. 中国科学院大学,北京 100049
  • 收稿日期:2017-01-11 出版日期:2018-08-11 发布日期:2018-09-02
  • 通讯作者: 孔令伟,男,1967年生,博士,研究员,博士生导师,主要从事特殊土的力学特性与灾害防治技术方面的研究工作。 E-mail: lwkong@whrsm.ac.cn E-mail:zzhxhp@163.com
  • 作者简介:曾志雄,男,1990年生,硕士研究生,主要从事特殊土土力学与地基基础方面的研究工作。
  • 基金资助:

    国家自然科学基金(No.41430634);岩土力学与工程国家重点实验室自主部署项目(No.Y11002)。

Mechanical properties and normalized stress-strain behaviour of Yanji swelling rock under wetting-drying-freezing-thawing cycles

ZENG Zhi-xiong1, 2, KONG Ling-wei1, 2, LI Jing-jing1, 2, LI Ju-zhao1, 2   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2017-01-11 Online:2018-08-11 Published:2018-09-02
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (41430634) and the Project of State Key Laboratory of Geomechanics and Geotechnical Engineering (Y11002).

摘要: 为了研究干湿、冻融和干湿-冻融循环作用对延吉膨胀岩的应力-应变关系、体变特性、抗剪强度的影响,开展了一系列的固结排水剪切试验。结果表明:未循环试样的应力-应变关系曲线表现为稳定型或弱应变软化型,3种环境作用后试样应力-应变关系曲线呈现出一定的应变软化特性,剪胀明显,而且围压越小、循环次数越高的试样软化和剪胀的程度越高;随着循环次数的增加,3种环境作用下试样的黏聚力急剧减小,而内摩擦角略有增加;干湿-冻融循环作用下试样的应力-应变关系软化程度最高,剪胀最显著,试样的黏聚力降低的幅度最大。基于Konder双曲线模型,对循环处理前后试样的应力-应变特性进行归一化分析,建立了考虑干湿-冻融循环次数和围压影响,能同时描述应变软化型和硬化型的应力-应变关系式,并对不同干湿-冻融循环次数试样的应力-应变曲线进行预测,预测值与实测值较为接近,预测效果较好。

关键词: 膨胀岩, 干湿-冻融循环, 应力-应变关系, 抗剪强度, 归一化

Abstract: Consolidated and drained triaxial shear tests were conducted on Yanji swelling rock to investigate the effects of wetting-drying, freezing-thawing and wetting-drying-freezing-thawing cycles on the stress-strain behaviour, volumetric strain and shear strength of Yanji swelling rock samples. The test results indicate that the stress-strain behaviour of samples before cyclic treatments appears to be strain-hardening, while the samples after cyclic treatments show strain-softening behaviour and more evident shear dilation. Additionally, the effects induced by cyclic treatments are more pronounced with increasing number of cycles and decreasing confining pressure. As the number of cycles increases, the cohesion of samples significantly decrease but the internal friction angle slightly increases. It can also be seen that the samples subjected to wetting-drying-freezing-thawing cycles suffer greater alterations in mechanical properties compared with those subject to separate wetting-drying and freezing-thawing cycles. Subsequently, a stress-strain formula considering the effect of wetting-drying-freezing-thawing cycles and confining pressure is presented based on Konder hyperbolic function, which can describe both strain-hardening and strain-softening behaviours. A comparison between the predicted and measured values verifies that this model can well predict aforementioned stress-strain behaviours.

Key words: swelling rock, wetting-drying-freezing-thawing cycle, stress-strain behaviour, shear strength, normalization

中图分类号: 

  • TU 443

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