蔡国军, 陈世豪, 赵大安, 周扬. 2019: 饱和砂土蠕变特性及其影响因素试验研究. 工程地质学报, 27(5): 1048-1055. DOI: 10.13544/j.cnki.jeg.2019027
    引用本文: 蔡国军, 陈世豪, 赵大安, 周扬. 2019: 饱和砂土蠕变特性及其影响因素试验研究. 工程地质学报, 27(5): 1048-1055. DOI: 10.13544/j.cnki.jeg.2019027
    CAI Guojun, CHEN Shihao, ZHAO Da'an, ZHOU Yang. 2019: EXPERIMENTAL STUDY ON CREEP CHARACTERISTICS OF SATURATED SAND AND ITS INFLUENCING FACTORS. JOURNAL OF ENGINEERING GEOLOGY, 27(5): 1048-1055. DOI: 10.13544/j.cnki.jeg.2019027
    Citation: CAI Guojun, CHEN Shihao, ZHAO Da'an, ZHOU Yang. 2019: EXPERIMENTAL STUDY ON CREEP CHARACTERISTICS OF SATURATED SAND AND ITS INFLUENCING FACTORS. JOURNAL OF ENGINEERING GEOLOGY, 27(5): 1048-1055. DOI: 10.13544/j.cnki.jeg.2019027

    饱和砂土蠕变特性及其影响因素试验研究

    EXPERIMENTAL STUDY ON CREEP CHARACTERISTICS OF SATURATED SAND AND ITS INFLUENCING FACTORS

    • 摘要: 为了研究饱和砂土的蠕变特性及其影响因素,开展了不同密度、不同级配方法(相似级配法、等量替代法)、不同加载方式的侧限高压单向压缩试验。试验结果表明:饱和砂土的蠕变主要经历3个阶段,分别为瞬时变形阶段、快速变形阶段和稳态蠕变变形阶段;压缩模量随密度的增大而增大;用相似级配法所制试样加权平均粒径比等量替代法所制试样的加权平均粒径小42.4%,压缩模量高8%~18%。不同加载方式对试样的最终变形量也有一定的影响。循环加载后,试样压缩模量减小4.3%~10.1%,最终应变量增加4.6%~6.0%。对试验数据进行统计分析表明,用幂函数可以很好地拟合饱和砂土的应力、应变、时间关系,最终得到适用于本砂土的蠕变模型。研究成果可在砂土地基设计、评估中得到应用。

       

      Abstract: This paper studies the creep characteristics of saturated sand and its influencing factors. It carries out the high pressure unidirectional compression tests of different density,different grading methods and different loading methods. The test results show that the creep of sand mainly undergoes three stages:instantaneous deformation,rapid deformation and steady-state creep deformation; the compressive modulus increases with the increase of density. The weighted average particle size of samples prepared by similar grading method is 42.4%smaller than that by equivalent substitution method,and the compression modulus is 8%~18% higher. Different loading methods have a certain influence on the final deformation of the sample. After cyclic loading,the compression modulus of samples decreased by 4.3%~10.1%,and the final strain variable increased by 4.6%~6.0%. The statistical analysis of the test data shows that the power function can well fit the stress,deformation and time relationship of saturated sand soil,and finally the creep model is suitable for this sand soil. The research results can be applied to the design and evaluation of sand foundation.

       

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