img

官方微信

img

群号:冰川冻土交流群

QQ群:218834310

高级检索

冰川冻土 ›› 2016, Vol. 38 ›› Issue (5): 1340-1345.doi: 10.7522/j.issn.1000-0240.2016.0157

• 寒区科学与技术 • 上一篇    下一篇

冻结黏土的动力学参数确定方法研究

罗飞2,3, 赵淑萍1,2, 马巍2, 蔡聪2   

  1. 1. 南京师范大学 地理科学学院, 江苏 南京 210023;
    2. 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;
    3. 四川农业大学 土木工程学院, 四川 都江堰 611830
  • 收稿日期:2016-04-09 修回日期:2016-08-20 出版日期:2016-10-25 发布日期:2017-01-22
  • 通讯作者: 赵淑萍,E-mail:shuping@lzb.ac.cn. E-mail:shuping@lzb.ac.cn
  • 作者简介:罗飞(1985-),男,四川广元人,讲师,2012年在中国科学院研究生院获硕士学位,主要从事冻土动力学和寒区工程方面的教学与研究工作.E-mail:luofei20052104@163.com
  • 基金资助:

    冻土工程国家重点实验室开放基金项目(SKLFSE201504);国家重点基础研究发展计划(973计划)项目(2012CB026106);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)资助

Study of determining the dynamic parameters of frozen clay

LUO Fei2,3, ZHAO Shuping1,2, MA Wei2, CAI Cong2   

  1. 1. School of Geography Science, Nanjing Normal University, Nanjing 210023, China;
    2. State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
    3. College of Civil Engineering, Sichuan Agricultural University, Dujiangyan 611830, Sichuan, China
  • Received:2016-04-09 Revised:2016-08-20 Online:2016-10-25 Published:2017-01-22

摘要:

基于黏弹性理论,对土的动弹性模量和阻尼比确定方法进行探讨,并结合青藏铁路沿线黏土在一系列温度下的动三轴试验结果,给出冻结黏土的动弹性模量和阻尼比的确定方法.结果表明:冻结黏土的骨干曲线不是双曲线,建议通过滞回曲线求冻土的动弹性模量和动应变幅,从而获得它们之间的关系;不同计算方法得到的阻尼比随动应变幅的变化趋势基本相同,用滞后角法计算得到的阻尼比整体小于用能量损失法计算得到的阻尼比,建议采用相关函数法计算应变滞后于应力的滞后角,然后用滞后角法计算土的阻尼比;冻结黏土的阻尼比随动应变幅的增加而增大.

关键词: 冻结黏土, 动弹性模量, 阻尼比, 能量损失法, 滞后角法, 动三轴试验

Abstract:

The calculation methods of dynamic elastic modulus and damping ratio of soil were discussed on basis of visco-elastic theory. According to the result of a series of tri-axial test on frozen clays sampled along the Qinghai-Tibet Railway, suggestions about how to calculate the dynamic parameters were put forward. The result shows that the backbone curve of frozen clay is not a hyperbolic one. The dynamic elastic modulus and dynamic strain amplitude can be calculated through hysteresis loop, and then revealed their relationship. The relations between damping ratio and dynamic strain amplitude calculated with different methods are the same. The damping ratio under the lag angle method is less than that under the energy loss method. The lag angle of strain and stress can be obtained from correlation function method. It is recommended that using correlation function method to calculate the lag angle between strain and stress, and using the lag angle to calculate the damping ratio. The damping ratio of frozen clay increases with dynamic strain amplitude.

Key words: frozen clay, dynamic elastic modulus, damping ratio, energy loss method, lag angle method, dynamic triaxial test

中图分类号: 

  • TU411.8/P642.14