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Shear strength of unsaturated granular soils: three-dimensional discrete element analyses

机译：非饱和粒状土的抗剪强度：三维离散元分析

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摘要

To investigate the shear strength behavior of unsaturated granular soils, the three-dimensional discrete element method has been used to model soils in triaxial compression tests. A simple but effective contact model with an attractive capillary force was implemented. The effects of matric suction and packing density on shear strength of unsaturated granular assemblies were examined. The Mohr Coulomb strength parameters (apparent cohesion and friction angle) were fitted for each matric suction examined. The results show that matric suction can increase the strength and modulus of granular soils and lead to increased dilation. The peak friction angle depends on the packing density but seems independent of matric suction. The apparent cohesion increases with matric suction non-linearly at a decreasing rate. Similar values of cohesion were observed for both dense and loose assemblies, which can be explained by the anisotropic distribution of capillary force network. Based on the microscopic observations, the stress-induced anisotropy of contact distributions leads to an anisotropic distribution of capillary water and, as a consequence, the capillary stress is anisotropic, imposing a shear effect on an assembly in parallel with that imposed by the externally applied loading. Consequently, the strength of unsaturated granular soil is controlled by the combined effects of packing density, and the magnitude and degree of anisotropy of the capillary stress. A new shear strength function for unsaturated soils, considering the anisotropic effects of matric suction, is proposed and validated using experimental data in the literature.
机译：为了研究非饱和颗粒状土的抗剪强度特性，在三维压缩试验中采用了三维离散元方法对土壤进行建模。一个简单但有效的接触模型具有吸引毛细作用力。考察了基质吸力和堆积密度对不饱和粒状组件剪切强度的影响。莫尔库仑强度参数（表观内聚力和摩擦角）适合每个检查的基质吸力。结果表明，基质吸力可以增加粒状土壤的强度和模量，并导致膨胀增加。峰值摩擦角取决于填充密度，但似乎与基质吸力无关。表观内聚力随着基质吸力的增加而非线性增加，并呈递减趋势。对于密集和松散的装配体，观察到相似的内聚力值，这可以通过毛细管力网络的各向异性分布来解释。基于微观观察，应力引起的接触分布的各向异性导致毛细管水的各向异性分布，结果，毛细管应力是各向异性的，从而对组件施加剪切效应，这与外部施加的应力平行加载中。因此，不饱和粒状土的强度受堆积密度，毛细应力各向异性大小和各向异性的综合作用控制。考虑到基质吸力的各向异性效应，提出了一种新的非饱和土抗剪强度函数，并利用文献中的实验数据进行了验证。

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  • 来源
    《Granular matter》 |2016年第3期|37.1-37.13|共13页
  • 作者

    Shen Zhifu; Jiang Mingjing; Thornton Colin;

  • 作者单位

    Tongji Univ, Dept Geotech Engn, Coll Civil Engn, 1239 Siping Rd, Shanghai 200092, Peoples R China|Tongji Univ, State Key Lab Disaster Reduct Civil Engn, Shanghai 200092, Peoples R China;

    Tongji Univ, Dept Geotech Engn, Coll Civil Engn, 1239 Siping Rd, Shanghai 200092, Peoples R China|Tongji Univ, State Key Lab Disaster Reduct Civil Engn, Shanghai 200092, Peoples R China;

    Univ Birmingham, Sch Chem Engn, Birmingham B15 2TT, W Midlands, England;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Unsaturated granular soils; Shear strength; Capillary water; Discrete element method; Fabric; Anisotropy;

    机译：非饱和颗粒土;抗剪强度;毛细管水;离散元法;织物;各向异性;

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