| 超单元体在三轴试验三维离散元模拟中的应用研究 |
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| 引用本文： | 陆烨.超单元体在三轴试验三维离散元模拟中的应用研究[J].土木工程学报,2011(Z2):106-109. |
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| 作者姓名： | 陆烨 |
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| 作者单位： | 上海大学; |
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| 基金项目： | 国家自然科学基金(51109125) |
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| 摘 要： | 通过干砂三轴试验的三维离散元模拟,探讨使用超单元体这种不规则颗粒单元对试验结果的影响。相对于使用较多的圆球体颗粒,超单元体不仅是对实际砂土颗粒形状更好的拟合,更极大地提高了试件的受力性能,使应力-应变曲线更加贴合实测曲线。通过对模拟结果的细观分析,发现超单元体使试件的细观行为(局部孔隙率、配位数的变化)更为符合实际砂土。随着三轴剪切的进行,试件内部的局部孔隙率的差异性增大,同时由于受力的三向不等性使配位数大幅度降低。
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| 关 键 词： | 超单元体 三维离散元 三轴试验 局部孔隙率 配位数 |
Application of clumps in 3-D DEM modeling of triaxial tests |
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| Lu Ye.Application of clumps in 3-D DEM modeling of triaxial tests[J].China Civil Engineering Journal,2011(Z2):106-109. |
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| Authors: | Lu Ye |
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| Affiliation: | Lu Ye (Shanghai University,Shanghai 200072,China) |
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| Abstract: | In 3-D discrete element method(DEM) modeling,a clump is comprised of multiple spheres overlapping each other so that different aspect ratios and particle shapes can be achieved.Compared with single spheres,clumps are better simulations of the real soil particles which are irregular in nature.Application of clumps to 3-D DEM models can reduce large magnitude rotations and enhance interlocking between particles.Interlocking plays an important role in helping effective particle chains to develop,which conseque... |
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| Keywords: | clumps 3-D DEM triaxial tests local void ratio coordination number |
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