Anisotropy of a Tensorial Bishop’s Coefficient for Wetted Granular Materials
Anisotropy of a Tensorial Bishop’s Coefficient for Wetted Granular Materials
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DOI：
10.1061/(asce)em.1943-7889.0001005
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发表时间：
2017-03
期刊：
影响因子：
--
通讯作者：
Kun Wang;WaiChing Sun
中科院分区：
文献类型：
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作者：
Kun Wang;WaiChing Sun
摘要本研究的目的是利用颗粒尺度的数值模拟来分析润湿颗粒物质中应力各向异性的演化。通过对非饱和颗粒材料的多物理颗粒模拟，分析了在不同的吸力和载荷历史条件下，接触力链和液桥的相互作用对宏观响应的影响。为了研究液桥的形成和破裂如何影响润湿颗粒材料的力学响应，进行了一系列吸力控制的三轴试验，其中两个颗粒组件，一个由相似尺寸的大颗粒组成，另一个由大颗粒与大量细粉的混合物组成。结果表明，毛细管应力是各向异性的两组标本，和应力各向异性是更显着的颗粒组装填充细颗粒。引入广义张量毕肖普系数分析了非线性系统的连接问题。
AbstractThe objective of this research is to use grain-scale numerical simulations to analyze the evolution of stress anisotropy exhibited in wetted granular matter. Multiphysical particulate simulations of unsaturated granular materials were conducted to analyze how the interactions of contact force chains and liquid bridges affect macroscopic responses under various suction pressure and loading histories. To study how the formation and rupture of liquid bridges affect the mechanical responses of wetted granular materials, a series of suction-controlled triaxial tests were conducted with two grain assemblies, one composed of large particles of similar sizes, the other composed of a mixture of large particles with significant amount of fines. The results indicate that capillary stresses are anisotropic in both sets of specimens, and that stress anisotropy is more significant in granular assemblies filled with fine particles. A generalized tensorial Bishop’s coefficient is introduced to analyze the connect...