袁权, 谢锦宇, 任柯. 2016: 边界约束对膨胀土干缩开裂的影响. 工程地质学报, 24(4): 604-609. DOI: 10.13544/j.cnki.jeg.2016.04.015
    引用本文: 袁权, 谢锦宇, 任柯. 2016: 边界约束对膨胀土干缩开裂的影响. 工程地质学报, 24(4): 604-609. DOI: 10.13544/j.cnki.jeg.2016.04.015
    YUAN Quan, XIE Jinyu, REN Ke. 2016: EFFECT OF BOUNDARY CONSTRAINS ON DESICCATION CARCK OF SWELLING SOIL. JOURNAL OF ENGINEERING GEOLOGY, 24(4): 604-609. DOI: 10.13544/j.cnki.jeg.2016.04.015
    Citation: YUAN Quan, XIE Jinyu, REN Ke. 2016: EFFECT OF BOUNDARY CONSTRAINS ON DESICCATION CARCK OF SWELLING SOIL. JOURNAL OF ENGINEERING GEOLOGY, 24(4): 604-609. DOI: 10.13544/j.cnki.jeg.2016.04.015

    边界约束对膨胀土干缩开裂的影响

    EFFECT OF BOUNDARY CONSTRAINS ON DESICCATION CARCK OF SWELLING SOIL

    • 摘要: 膨胀土是岩土工程中常见的一类特殊土,具有失水收缩和吸水膨胀的变形特征,如何量化收缩变形及其与干缩裂缝之间的关系是土工建筑物稳定性和安全性评估的基本问题。本文利用Bishop有效应力原理和广义胡克定律证明了采用含水率或基质吸力为基本变量的两种分析方法的等价性。把岩土工程中常用的原状土收缩实验中测量的收缩系数与收缩应变关联,得到了土体两端存在和没有位移约束时的总水平应力及其与含水率分布之间的关系。结果表明,无边界位移约束时,收缩变形的不均匀性小,应力水平低,且含水率对应力分布的影响小;存在约束时,收缩变形将受到限制,易诱发干缩裂缝,其深度受土体弹性模量和收缩系数的影响。

       

      Abstract: Swelling soil is a special soil often encountered in geotechnical engineering. It is of classic drying shrinkage and water swelling characteristics due to the moisture change in soil. How to quantify the shrinkage deformation and its relationship with desiccation crack is important issue in assessment of the stability and security of earth structures. The analysis based on distribution of water content is proved to be equivalent of that base on matric suction by Bishop's effective stress and generalized Hooke's Law. The shrinkage coefficient measured by shrinkage test of undisturbed soil sample can be associated with shrinkage strain. The total horizontal stress and its relationship with the distribution of water content is obtained with or without consideration of boundary displacement constrains. The results show that the non-uniform of shrinkage deformation and stress level is small and little desiccation cracks will be produced when there are no boundary constrains in soil. But if the displacement constrains are imposed at the ends of soil body, shrinkage deformation can be restrained and desiccation cracks can be produced. The depth of desiccation crack is strongly influenced by Young's modulus and shrinkage coefficient of soil.

       

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