Combined FEM/DEM Modeling of Triaxial Compression Tests for Rockfills with Polyhedral Particles
Combined FEM/DEM Modeling of Triaxial Compression Tests for Rockfills with Polyhedral Particles
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DOI：
10.1061/(asce)gm.1943-5622.0000372
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发表时间：
2014-08
影响因子：
3.7
通讯作者：
G. Ma;W. Zhou;X. Chang;W. Yuan
中科院分区：
文献类型：
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作者：
G. Ma;W. Zhou;X. Chang;W. Yuan
摘要采用微观建模方法，利用不规则凸多面体对离散单元的形状进行了简化，再现了堆石体的几何特性。采用有限元/离散元相结合的方法对三轴压缩试验进行了数值模拟。对数值试件的微观力学性能进行了校准，使之与实际材料的宏观响应相匹配。数值计算结果与试验结果定量吻合，再现了堆石料的非线性应力应变关系、压实和剪胀等典型力学行为特征。有限元/离散元联合模拟为定量研究堆石料颗粒组合的微观结构提供了机会，从而更好地了解堆石料的力学特性。
AbstractUsing a microscopic modeling approach, a simplification of the discrete element’s shape was done by using irregular convex polyhedrons to reproduce the geometry-dependent behavior of rockfills. Numerical modeling of the triaxial compression tests was conducted using a combined FEM and discrete-element method (FEM/DEM). The micromechanical properties of the numerical sample were calibrated to match the macroscopic response of the real material. The numerical results quantitatively agree with the laboratory results, which reproduce typical features of the mechanical behavior of rockfills, such as nonlinear stress-strain relationship, compaction, and shear dilatancy. The combined FEM/DEM simulation provides an opportunity for a quantitative study of the microstructure of particle assemblages, which give a better understanding of the mechanical characteristics of rockfills.