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Two-dimensional discrete element modelling of bender element tests on an idealised granular material

机译：理想化颗粒材料上弯曲元素测试的二维离散元素建模

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摘要

The small-strain (elastic) shear stiffness of soil is an important parameter in geotechnics. It is required as an input parameter to predict deformations and to carry out site response analysis to predict levels of shaking during earthquakes. Bender element testing is often used in experimental soil mechanics to determine the shear (S-) wave velocity in a given soil and hence the shear stiffness. In a bender element test a small perturbation is input at a point source and the propagation of the perturbation through the system is measured at a single measurement point. The mechanics and dynamics of the system response are non-trivial, complicating interpretation of the measured signal. This paper presents the results of a series of discrete element method (DEM) simulations of bender element tests on a simple, idealised granular material. DEM simulations provide the opportunity to study the mechanics of this testing approach in detail. The DEM model is shown to be capable of capturing features of the system response that had previously been identified in continuum-type analyses of the system. The propagation of the wave through the sample can be monitored at the particle-scale in the DEM simulation. In particular, the particle velocity data indicated the migration of a central S-wave accompanied by P- waves moving along the sides of the sample. The elastic stiffness of the system was compared with the stiffness calculated using different approaches to interpreting bender element test data. An approach based upon direct decomposition of the signal using a fast-Fourier transform yielded the most accurate results.
机译：土的小应变（弹性）剪切刚度是岩土工程中的重要参数。需要使用它作为输入参数来预测变形并执行站点响应分析以预测地震期间的震动水平。弯曲单元测试通常用于实验土壤力学中，以确定给定土壤中的剪切（S-）波速，从而确定剪切刚度。在弯曲机元件测试中，在点源处输入小的干扰，并且在单个测量点处测量通过系统的干扰传播。系统响应的力学和动力学是不平凡的，使对测量信号的解释变得复杂。本文介绍了在简单，理想化的粒状材料上进行的弯曲元件测试的一系列离散元素方法（DEM）模拟的结果。 DEM仿真为详细研究这种测试方法的机制提供了机会。显示出DEM模型能够捕获先前在系统的连续体类型分析中已确定的系统响应特征。波在样品中的传播可以在DEM模拟中以粒子尺度进行监控。特别地，粒子速度数据指示伴随着沿样品侧面移动的P波的中心S波的迁移。将系统的弹性刚度与使用不同方法解释弯曲元件测试数据所计算出的刚度进行了比较。使用快速傅立叶变换基于信号直接分解的方法产生了最准确的结果。

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  • 来源
    《Granular matter》 |2012年第6期|p.733-747|共15页
  • 作者

    J. ODonovan; C. OSullivan; G. Marketos;

  • 作者单位

    Department of Civil and Environmental Engineering, Imperial College London, London, UK;

    Department of Civil and Environmental Engineering, Imperial College London, London, UK;

    Department of Civil and Environmental Engineering, Imperial College London, London, UK;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    discrete element simulation; stiffness; shear wave; small strain;

    机译：离散元模拟;刚性;剪切波小应变;

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