边学成, 李伟, 李公羽, TUTUMLUER-Erol. 基于颗粒真实几何形状的铁路道砟剪切过程三维离散元分析[J]. 工程力学, 2015, 32(5): 64-75,83. DOI: 10.6052/j.issn.1000-4750.2013.11.1029
引用本文: 边学成, 李伟, 李公羽, TUTUMLUER-Erol. 基于颗粒真实几何形状的铁路道砟剪切过程三维离散元分析[J]. 工程力学, 2015, 32(5): 64-75,83. DOI: 10.6052/j.issn.1000-4750.2013.11.1029
BIAN Xue-cheng, LI Wei, LI Gong-yu, TUTUMLUER-Erol. THREE-DIMENSIONAL DISCRETE ELEMENT ANALYSIS OF RAILWAY BALLAST’S SHEAR PROCESS BASED ON PARTICLES’ REAL GEOMETRY[J]. Engineering Mechanics, 2015, 32(5): 64-75,83. DOI: 10.6052/j.issn.1000-4750.2013.11.1029
Citation: BIAN Xue-cheng, LI Wei, LI Gong-yu, TUTUMLUER-Erol. THREE-DIMENSIONAL DISCRETE ELEMENT ANALYSIS OF RAILWAY BALLAST’S SHEAR PROCESS BASED ON PARTICLES’ REAL GEOMETRY[J]. Engineering Mechanics, 2015, 32(5): 64-75,83. DOI: 10.6052/j.issn.1000-4750.2013.11.1029

基于颗粒真实几何形状的铁路道砟剪切过程三维离散元分析

THREE-DIMENSIONAL DISCRETE ELEMENT ANALYSIS OF RAILWAY BALLAST’S SHEAR PROCESS BASED ON PARTICLES’ REAL GEOMETRY

  • 摘要: 铁路道床由尺寸和形状各异的道砟颗粒组成,道砟颗粒的形状对道床的强度、变形等力学特性具有显著影响,反映颗粒单一方向尺寸分布特征的级配曲线难以全面描述形状不规则的道砟颗粒的几何特征。该文利用计算机视觉成像技术获得道砟颗粒在三个相互垂直方向的投影图,提取投影图轮廓并计算其几何特征参数;基于颗粒三视图重建与真实道砟颗粒具备相同几何特征的三维模型,引入到自行开发的三维块体离散元数值模拟程序中,建立了真实道砟颗粒料的三维离散元分析模型。通过与多种竖向压力作用下的室内直剪试验结果进行对比,验证了该方法可靠性;并在此基础上对道砟颗粒料在直剪试验中的变形和细观力学特性进行了深入详细的分析。

     

    Abstract: Ballast beds are made up of particles with diverse sizes and shapes. Particle shape plays a fairly important role in affecting ballast aggregate’s mechanical behaviors; however, conventional grading curves indicating particle unidirectional size distribution cannot describe ballast particle shape characteristics comprehensively. Computer-vision technology is applied to obtaining three orthogonal views of a ballast particle, then extracting outlines of these three views to compute particle shape characteristic parameters. Three dimensional discrete element numerical simulations of ballast aggregate are processed by a self-developed program using elements which are built based on a particle’s three orthogonal views and identical in shape characteristics to realistic ballast particles. The computer-vision based discrete element method is validated with predictions from discrete element simulations matching closely with laboratory direct shear test results. Ballast aggregate’s deformation features and micro-scale mechanical behaviors in direct shear tests are investigated in depth based on the validated discrete element method

     

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