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Laboratory investigation on strength and deformation characteristics of ice-saturated frozen sandy soil

机译：冰饱和冰冻砂土强度与变形特性的室内研究

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摘要

To investigate the properties of ice-saturated frozen sandy soil, a series of triaxial compression tests on frozen sandy soil with a volumetric ice content of about 50% were carried out at a temperature of - 2.0 ℃. The effect of confining pressure on strength and deformation features is analyzed according to the experimental results. The results show that the strength changes with increasing confining pressure in three distinct phases. According to the effective stress principle, the mechanism of strength is explained. A strength criterion is proposed to describe the strength characteristic. The equivalent stress versus axial strain curve shows strain-softening under each confining pressure, and the extent of strain-softening decreases with the increase in confining pressure, until it behaves the so-called perfect elasto-plastic feature when the confining pressure is large enough. The improved Duncan-Chang hyperbolic model is taken to simulate the stress-strain behaviors. The simulation shows that the model can well describe the strain-softening. The dependency of the volumetric deformation on the confining pressure is also discussed.
机译：为了研究冰饱和的冰冻砂土的性质，在-2.0℃的温度下，对体积冰含量约为50％的冰冻砂土进行了一系列三轴压缩试验。根据实验结果分析了围压对强度和变形特征的影响。结果表明，强度随着围压的增加而在三个不同阶段发生变化。根据有效应力原理，解释了强度的机理。提出了一种强度准则来描述强度特性。当量应力-轴向应变曲线显示出在每种围压下的应变软化，并且随着围压的增加，应变软化程度减小，直到当围压足够大时才表现出所谓的完美弹塑性特征。采用改进的邓肯-张双曲线模型来模拟应力-应变行为。仿真表明，该模型可以很好地描述应变的软化。还讨论了体积变形对围压的依赖性。

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  • 来源
    《Cold regions science and technology》 |2011年第1期|p.98-104|共7页
  • 作者

    Xiangtian Xu; Yuanming Lai; Yuanhong Dong; Jilin Qi;

  • 作者单位

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

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

    State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Cansu, Lanzhou, 730000, China,CCCC First Highway Consultants CO., LTD, Shaanxi, Xi'an, 710075, China;

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

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    frozen sandy soil; strength criterion; stress-strain behavior; pressure melting; confining pressure;

    机译：冻沙土强度标准;应力应变行为;压力熔化围压;

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