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Experimental study and statistical theory of creep behavior of warm frozen silt

机译：暖冻粉土蠕变行为的试验研究与统计理论

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摘要

To investigate the soil parameters and stochastic mechanical characteristics of warm frozen silt, a series of triaxial compression tests were conducted on frozen silt at the temperature of -1.5A degrees C under confining pressures of 0.5, 1.0, and 2.0 MPa. The results indicate that the creep properties of warm frozen silt are affected considerably by stress levels. The creep show present primary and secondary creep stages under low stress level and indicate that the specimen is destroyed quickly under high stress levels. Based on phenomenological theory, a unified creep constitutive model of warm frozen silt was proposed. The results predicted by the proposed model agree well with corresponding experimental data. Investigation of the random distribution has revealed that the parameters of the proposed creep model could be better described by a normal distribution. Based on the dynamic theory of frozen soil strength, the long-term strength of warm frozen silt was obtained, and was found to exhibit nonlinear behavior with increasing confining pressure. The Weibull function can represent the random distribution well, and the reliabilities of long-term strength were given under different confining pressures.
机译：为了研究暖冻粉土的土壤参数和随机力学特性，在0.5、1.0和2.0 MPa的围压下，在-1.5A摄氏度的温度下对冻土进行了一系列三轴压缩试验。结果表明，温冻粉土的蠕变特性受应力水平的影响很大。蠕变显示出在低应力水平下当前的初级和次级蠕变阶段，并表明在高应力水平下样品被快速破坏。基于现象学理论，建立了温冻粉砂的统一蠕变本构模型。该模型预测的结果与相应的实验数据吻合良好。对随机分布的研究表明，建议的蠕变模型的参数可以通过正态分布更好地描述。根据冻土强度的动力学理论，获得了暖冻粉土的长期强度，发现随着围压的增加其非线性行为。 Weibull函数可以很好地表示随机分布，并且在不同的围压下给出了长期强度的可靠性。

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  • 来源
    《KSCE journal of civil engineering》 |2016年第6期|2333-2344|共12页
  • 作者

    Liao Mengke; Lai Yuanming; Yang Junjie; Li Shuangyang;

  • 作者单位

    Chinese Acad Sci, State Key Lab Frozen Soil Engn, Cold & Arid Reg Environm & Engn Res Inst, Lanzhou 730000, Peoples R China|Chinese Acad Sci, Lanzhou 730000, Peoples R China;

    Chinese Acad Sci, State Key Lab Frozen Soil Engn, Cold & Arid Reg Environm & Engn Res Inst, Lanzhou 730000, Peoples R China|Chinese Acad Sci, Lanzhou 730000, Peoples R China;

    Lanzhou Jiaotong Univ, Sch Civil Engn, Lanzhou 730070, Peoples R China;

    Chinese Acad Sci, State Key Lab Frozen Soil Engn, Cold & Arid Reg Environm & Engn Res Inst, Lanzhou 730000, Peoples R China|Chinese Acad Sci, Lanzhou 730000, Peoples R China;

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

    creep; warm frozen silt; constitutive model; long-term strength; statistical theory;

    机译：蠕变暖冻粉土本构模型长期强度统计理论;

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