Noncoaxiality considering inherent anisotropy under various loading paths in a strain space multiple mechanism model for granular materials
Noncoaxiality considering inherent anisotropy under various loading paths in a strain space multiple mechanism model for granular materials
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DOI：
10.1002/nag.3183
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发表时间：
2020-12
影响因子：
4
通讯作者：
K. Ueda;S. Iai
中科院分区：
文献类型：
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作者：
K. Ueda;S. Iai
固有各向异性是一个至关重要的方面，要考虑，以提高一个人的理解的行为，颗粒材料，特别是，非同轴响应下的比例和非比例载荷。本文研究了应变空间多机制模型再现各种加载路径下固有各向异性土的复杂响应的能力。通过沿着三个附加参数引入新函数，对本构模型进行了扩展，以考虑固有各向异性的影响;其中两个参数a1和a2控制各向异性的程度，而第三个参数θ0代表固有各向异性的主要方向。实验室实验数据的各种加载路径下的丰浦砂的复杂的各向异性响应被用来验证本构模型。该模型被发现成功地模拟各向异性排水土的反应单调比例和非比例荷载下，以及那些在加载下，涉及的旋转的主应力轴通过考虑额外的各向异性参数。此外，固有各向同性材料的模拟响应与各向异性材料的模拟响应进行了比较，以数值研究固有各向异性（即各向异性参数）在这种荷载条件下对土体行为的影响。
Inherent anisotropy is a crucial aspect to consider to improve one's understanding of the behavior of granular materials, in particular, noncoaxial responses under proportional and nonproportional loadings. This article investigates the capability of a strain space multiple mechanism model to reproduce complex responses of inherently anisotropic soils under various loading paths. The constitutive model has been expanded upon to account for the effect of inherent anisotropy by incorporating a new function along with three additional parameters; two of these parameters, a1 and a2 , control the degree of anisotropy, whereas the third parameter, θ0 , represents the principal direction of inherent anisotropy. Laboratory experimental data regarding the complex anisotropic responses of Toyoura sand under various loading paths are used to validate the constitutive model. The model is found to successfully simulate the anisotropic drained soil responses under monotonic proportional and nonproportional loadings as well as those under loading involving the rotation of the principal stress axis by considering the additional anisotropic parameters. Furthermore, the simulated responses of inherently isotropic materials are compared with those of anisotropic materials to numerically investigate the influence of inherent anisotropy (ie, the anisotropic parameters) on soil behavior under such loading conditions.