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冰川冻土 ›› 2016, Vol. 38 ›› Issue (4): 1012-1017.doi: 10.7522/j.issn.1000-0240.2016.0117

• 土动力学与土工抗震 • 上一篇    下一篇

分级加载下冻结黏土的动应变幅变化特征

罗飞1 2 3, 赵淑萍3, 朱占元1 2 3, 周小婉1 2, 毛磊1 2, 钱进4, 余锐1   

  1. 1. 四川农业大学 土木工程学院, 四川 都江堰 611830;
    2. 村镇建设防灾减灾四川省高等学校工程研究中心, 四川 都江堰 611830;
    3. 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, 甘肃 兰州 730000;
    4. 四川省交通运输厅交通勘察设计研究院, 四川 成都 610017
  • 收稿日期:2016-02-07 修回日期:2016-07-27 出版日期:2016-08-25 发布日期:2016-09-19
  • 作者简介:罗飞(1985-),男,四川广元人,讲师,2012年在中国科学院寒区旱区环境与工程研究所获硕士学位,现从事冻土动力学和寒区工程方面的教学与科研.E-mail:luofei20052104@163.com
  • 基金资助:
    国家自然科学基金项目(41672304);四川省教育厅科研创新团队项目(16TD0006);四川省教育厅项目(035Z1041);村镇建设防灾减灾四川省高等学校工程研究中心项目(CDPMV1407);冻土工程国家重点实验室开放基金项目(SKLFSE201214)资助

The characteristics of dynamic strain amplitude of frozen clay with stepped axial cyclic loading

LUO Fei1 2 3, ZHAO Shuping3, ZHU Zhanyuan1 2 3, ZHOU Xiaowan1 2, MAO Lei1 2, QIAN Jin4, YU Rui1   

  1. 1. College of Civil Engineering, Sichuan Agricultural University, Dujiangyan 611830, Sichuan, China;
    2. Sichuan Higher Education Engineering Research Center for Disaster Prevention and Mitigation of Village Construction, Dujiangyan 611830, Sichuan, China;
    3. State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
    4. Sichuan Communication Surveying & Design Institute, Chengdu 610017, China
  • Received:2016-02-07 Revised:2016-07-27 Online:2016-08-25 Published:2016-09-19

摘要: 动应变幅反映土的振动特征和阻尼特性,温度影响土中水的形态,从而影响动应变幅的大小.采用MTS-810型三轴试验机对一系列温度下黏土的动应变幅变化特征进行研究,结果表明:仪器误差、操作误差等可能使试验结果具有变异性,可采用取平均值的方法来减小试验结果的变异性.动应变幅随加载级数的增加逐渐增大.当温度高于土中水的冻结点时,温度变化对动应变幅的影响较小;当温度低于土中水的冻结点时,随温度的降低,动应变幅变化较显著;当温度低于-4℃时,随温度的降低动应变幅几乎不发生改变.动应变幅随动应力幅的增大呈线性增大趋势.

关键词: 温度, 冻结黏土, 动三轴试验, 动应变幅

Abstract: The water form in the clay is affected by temperature, consequently affected dynamic strain amplitude of clay. The MTS-810 dynamic triaxial apparatus is used to make researches on the dynamic strain amplitude variation characteristics of frozen clay at a series of temperature. The results show that the dynamic tri-axial test results will be made variable by the instrumental error, operate miss and so on. And the method of repeated trials can be used to eliminate the variability of the test results. The dynamic strain amplitude increases when the load series increases. When the temperature is higher than the freezing point of water in clay, the change of temperature has less effect on dynamic strain amplitude. Inversely, when the temperature is lower than it, the dynamic strain amplitude changes significantly with the decreasing of temperature. When the temperature is lower than -4℃, the relationship curve of dynamic stress amplitude and dynamic strain almost coincide with the decrease of temperature. Dynamic strain amplitude increases linearly with the increase of dynamic stress amplitude.

Key words: temperature, frozen clay, dynamic tri-axial test, dynamic strain amplitude

中图分类号: 

  • TU411/P642.14