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Laboratory and theoretical investigations on the deformation and strength behaviors of artificial frozen soil

机译：人工冻土变形及强度特性的室内及理论研究

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摘要

In order to study the mechanical characteristic of artificial frozen soils, such as strength, and stress-strain relationship, a series of triaxial compression tests of frozen sand has been conducted under confining pressures varying from 0.0 to 14.0 MPa with different water contents at -6 ℃. Frozen sand presents strain softening during shearing process under low confining pressures; but with increasing confining pressure, the strain softening decreases, and even presents strain hardening under high confining pressures. The strength of frozen sand is affected by water content and confining pressure. The strength with low water content always increases with increasing confining pressure; however, for frozen sand with a high water content, the strength experiences an increase followed by a decrease with increasing confining pressure. To describe the strength characteristic of frozen sand, the non-linear Mohr-Coulomb criterion, in which the generalized internal friction angle and cohesion under various confining pressures are obtained from experimental results, has been presented. The result shows that the non-linear Mohr-Coulomb criterion can reflect the decrease of strength of frozen sand under high confining pressures. The stress-strain relationships of frozen sand are represented by hyperbolic functions, which can describe both the strain hardening behavior of frozen sand under high confining pressure and the strain softening behavior under a low confining pressure.
机译：为了研究人造冻土的力学特性，例如强度和应力-应变关系，已在0.0到14.0 MPa的围压下在-6的含水量下进行了一系列的冻土三轴压缩试验。 ℃。冷冻砂在低围压下的剪切过程中会出现应变软化。但是随着围压的增加，应变软化降低，甚至在高围压下呈现出应变硬化。冻砂的强度受含水量和围压的影响。含水量低的强度总是随着围压的增加而增加。但是，对于含水量高的冷冻砂，强度会随着围压的增加而增加，然后降低。为了描述冻结砂的强度特性，提出了非线性莫尔-库仑准则，该准则从实验结果中获得了在各种约束压力下的广义内摩擦角和内聚力。结果表明，非线性Mohr-Coulomb准则可以反映高围压下冻砂强度的降低。冻土的应力-应变关系由双曲线函数表示，可以描述高围压下冻土的应变硬化行为和低围压下的应变软化行为。

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  • 来源
    《Cold regions science and technology》 |2010年第1期|p.39-45|共7页
  • 作者

    Yugui Yang; Yuanming Lai; Xiaoxiao Chang;

  • 作者单位

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

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

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

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    artificial frozen soil; stress-strain relationship; generalized cohesion; generalized internal friction angle;

    机译：人造冻土;应力-应变关系;广义内聚广义内摩擦角;

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