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Experimental investigation of the dynamic behavior of frozen clay from the Beiluhe subgrade along the QTR

机译:北麓河路基冻土沿QTR动力特性的试验研究

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摘要

The dynamic behavior of frozen clay obtained from the Beiluhe permafrost subgrade along the Qjnghai-Tibet Railway (QTR) was investigated through cryo-dynamic triaxial experiments. The effects of several key factors, including temperature, moisture content, frequency and confining pressure on the dynamic behavior, were analyzed. It was found that a hyperbolic model could describe the dynamic behavior of the frozen clay well. The maximum dynamic shear modulus of the frozen soil decreases as the temperature rises and as the confining pressure decreases; the reference shear strain magnitude decreases as the temperature and confining pressure increase and as the moisture content decreases; the maximum damping ratio increases as the temperature, frequency and confining pressure increase and as the moisture content decreases. There exists a critical moisture content (around 18%) that maximizes the dynamic shear modulus; at the critical frequency (about 6 Hz), the dynamic shear modulus is at its maximum, and the reference shear strain magnitude and the damping ratio attenuation exponent are at their respective minima. Moreover, functions were proposed to quantitatively describe the relationship between frozen clay dynamic parameters and various influencing factors.
机译:通过低温动力三轴试验研究了北藏河多年冻土路基沿青藏铁路(QTR)获得的冻土的动力特性。分析了温度,水分含量,频率和围压等几个关键因素对动力学行为的影响。发现双曲线模型可以描述冻结黏土井的动态行为。随着温度的升高和围压的减小,冻土的最大动态剪切模量减小。随着温度和围压的增加以及含水量的减少,参考剪切应变的幅度减小。最大阻尼比随着温度,频率和围压的增加以及水分含量的降低而增加。存在一个临界水分含量(约18%),可以使动态剪切模量最大化。在临界频率(大约6 Hz)下,动态剪切模量处于最大值,参考剪切应变幅度和阻尼比衰减指数处于各自的最小值。此外,提出了定量描述冻土动力参数与各种影响因素之间关系的函数。

著录项

  • 来源
    《Cold regions science and technology》 |2011年第1期|p.91-97|共7页
  • 作者单位

    Centre of Subgrade and Prevention Engineering, Harbin Institute of Technology, Heilongjiang, Harbin 150090, China,Urban and Rural Construction College, Sichuan Agricultural University, Sichuan, Dujiangyan 6! 1830, China,State Key Laboratory of Frozen Soils Engineering, Chinese Academy of Science, Cansu, Lanzhou 730000, China;

    Centre of Subgrade and Prevention Engineering, Harbin Institute of Technology, Heilongjiang, Harbin 150090, China,State Key Laboratory of Frozen Soils Engineering, Chinese Academy of Science, Cansu, Lanzhou 730000, China;

    Centre of Subgrade and Prevention Engineering, Harbin Institute of Technology, Heilongjiang, Harbin 150090, China;

    Structural and Geotechnical Engineering, Polytechnic University of Turin, Turin, Turin 10129, Italy;

    Centre of Subgrade and Prevention Engineering, Harbin Institute of Technology, Heilongjiang, Harbin 150090, China;

    Urban and Rural Construction College, Sichuan Agricultural University, Sichuan, Dujiangyan 6! 1830, China;

    Urban and Rural Construction College, Sichuan Agricultural University, Sichuan, Dujiangyan 6! 1830, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    frozen clay; dynamic shear modulus; damping ratio; dynamic behavior; cryo-dynamic triaxial experiment; qinghai-tibet railway;

    机译:冷冻粘土动态剪切模量阻尼比;动态行为低温动力三轴实验;青藏铁路;

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