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Investigating geogrid-reinforced ballast: Experimental pull-out tests and discrete element modelling

机译：研究土工格栅加固的压载物：实验拉拔试验和离散单元建模

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摘要

This paper presents an evaluation of the interlocking behaviour of geogrid-reinforced railway ballast. Experimental large box pull-out tests were conducted to examine the interaction between ballast and a biaxial geogrid. The discrete element method (DEM) was then used to model the interaction between the ballast and the geogrid by simulating large box pull-out tests and comparing the findings with the experimental results. Four different shapes of clumps were used to represent each ballast particle in order to obtain an acceptable shape for modelling the railway ballast. The DEM simulation results were shown to provide good predictions of the pull-out resistance and to examine the effect of clump shape on both the pull-out resistance and the distribution of contact forces. Therefore, the calibrated geogrid model and the 8-ball tetrahedral clumps, used as ballast particles, hold much promise for investigating the interaction between geogrids and ballast, and thus, optimising performance.
机译：本文介绍了土工格栅加固铁路道ast的联锁行为。进行了实验性的大箱体拉出试验，以检查压载物和双轴土工格栅之间的相互作用。然后，通过模拟大型箱式拉拔试验并将发现与实验结果进行比较，使用离散元方法（DEM）对道ast与土工格栅之间的相互作用进行建模。为了获得可接受的用于建模铁路道ast的形状，使用了四种不同形状的团块来表示每个道ast颗粒。 DEM仿真结果显示出可提供良好的抗拔出力预测，并可检查结块形状对抗拔出性和接触力分布的影响。因此，校准的土工格栅模型和用作压载物颗粒的8球四面体团块，对于研究土工格栅与压载物之间的相互作用，从而优化性能具有广阔的前景。

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  • 来源
    《Soils and foundations》 |2014年第1期|1-11|共11页
  • 作者

    Cheng Chen; G.R. McDowell; N.H. Thom;

  • 作者单位

    Nottingham Centre for Geomechanics, Faculty of Engineering, University of Nottingham, Nottingham, NG7 2RD, UK;

    Nottingham Centre for Geomechanics, Faculty of Engineering, University of Nottingham, Nottingham, NG7 2RD, UK;

    Nottingham Transportation Engineering Centre, Faculty of Engineering, University of Nottingham, Nottingham, NG7 2RD, UK;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Pull-out test; Railway ballast; Geogrid; Clump shape; Discrete element modelling;

    机译：拔出测试;铁路道ball土工格栅;团块形状;离散元建模;

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