Strength anisotropy of fibre-reinforced sands under multiaxial loading
Strength anisotropy of fibre-reinforced sands under multiaxial loading
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DOI：
10.1680/jgeot.17.p.102
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发表时间：
2019-03-01
期刊：
影响因子：
5.8
通讯作者：
Ibraim, E.
中科院分区：
文献类型：
--
作者：
Mandolini, A.;Diambra, A.;Ibraim, E.
采用空心圆柱扭转试验装置，研究了纤维增强砂土在多轴应力空间中的强度各向异性。探测应力路径下恒定的细胞压力已进行未加固和加固砂试样，以评估纤维增强贡献的主应力方向的取向的影响。首次确定了纤维加筋土在多轴应力空间中的偏强度包络线。纤维的添加产生各向异性的增加和变形的偏强度信封相比，未加固的土壤基质。纤维增强的贡献取决于拉伸应变域的发展和纤维取向分布。纤维的加入对体积响应，主应力和应变率的非同轴性，以及剪切带的形成的复合材料的效果的进一步观察。一个分析模型捕捉各向异性纤维增强贡献的开发和讨论。
The strength anisotropy of fibre-reinforced sands in the multiaxial stress space has been investigated using a hollow cylinder torsional apparatus. Probing stress paths under constant cell pressure have been performed on both unreinforced and reinforced sand specimens to assess the influence of the orientation of the principal stress directions on the fibre strengthening contribution. For the first time, a deviatoric strength envelope for fibre-reinforced soils in the multiaxial stress space was identified. The addition of fibres produces an anisotropic increase and a distortion of the deviatoric strength envelope if compared to the unreinforced soil matrix. The fibre strengthening contribution is governed by the tensile strain domain developed and the fibre orientation distribution. Further observations on the effect of the addition of fibres on the volumetric response, principal stress and strain rate non-coaxiality, as well as the shear bands formation of the composite, are presented. An analytical model to capture the anisotropic fibre strengthening contribution is developed and discussed.