• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Geotechnique >DEM modelling of mini-triaxial test based on one-to-one mapping of sand particles
【24h】

DEM modelling of mini-triaxial test based on one-to-one mapping of sand particles

机译：基于一对一砂粒映射的迷你三轴试验模拟

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

This paper presents a discrete-element method simulation of mini-triaxial tests on a sand with realistically shaped grains. It compares the results with physical experiments at multiple length scales, including the macroscopic sample length scale and the particle scale. A series of image-processing techniques were utilised to binarise, segment and label the raw data in images obtained from the mini-triaxial test. The images were obtained using an X-ray synchrotron radiation scanner. A spherical harmonic analysis was used to filter the image data and to reconstruct the natural particle morphology. Two parameters, these being the radius ratio of the smallest to largest sphere. and a characteristic distance phi is an element of[0 degrees, 180 degrees] within the multisphere clump method, were chosen to represent the realistic particle morphology, balancing accuracy against computational cost. A one-to-one discrete-element model, where every particle in the physical experiment has its own numerical twin, was constructed. The discrete-element model was contained by a numerically generated flexible membrane allowing free deformation of the specimen under a prescribed confining stress, as in a physical triaxial test. Finally, attention was given to particle scale properties and their influences on the mechanical response of the discrete-element model. For a given strain rate it was found that shear modulus and friction coefficient affect the initial stiffness, the peak load and the dilation significantly. This study, and the simulation results within it, demonstrate that the proposed modelling approach is capable of reproducing macroscopic (e.g. stiffness, deviatoric stress response and volumetric response) and particle-level (e.g. displacement, rotation and branch vector orientation) behaviours that are very similar to what occurs within physical experiments, validating the effectiveness of the proposed one-to-one mapping technique.
机译：本文介绍了具有现实形状晶粒的沙子上的迷你三轴试验的离散元素模拟。它将结果与多个长度的物理实验进行比较，包括宏观样品长度和粒度。一系列图像处理技术用于二班，段和标记从迷你三轴测试获得的图像中的原始数据。使用X射线同步辐射扫描仪获得图像。球形谐波分析用于过滤图像数据并重建天然粒子形态。两个参数，这些是最小到最大球体的半径比。并且特征距离PHI是多苯克化方法内的[0度，180度]的元素，选择了逼真的粒子形态，平衡计算成本的准确性。构建了一个一对一的离散元模型，其中物理实验中的每种粒子有自己的数值双胞胎。离散元件模型由数值产生的柔性膜含有，允许样品在规定的限制应激下的自由变形，如在物理三轴试验中。最后，给予粒子规模性质及其对离散元模型的机械响应的影响。对于给定的应变速率，发现剪切模量和摩擦系数显着影响初始刚度，峰值载荷和扩张。本研究和其中的仿真结果表明，所提出的建模方法能够再现宏观（例如刚度，偏离应力响应和体积响应）和粒度（例如位移，旋转和分支矢量方向）的行为类似于物理实验中发生的内容，验证所提出的一对一映射技术的有效性。

著录项

  • 来源
    《Geotechnique》 |2021年第8期|714-727|共14页
  • 作者

    Wu Mengmeng; Wang Jianfeng; Russell Adrian; Cheng Zhuang;

  • 作者单位

    City Univ Hong Kong Dept Architecture & Civil Engn Hong Kong Peoples R China;

    City Univ Hong Kong Dept Architecture & Civil Engn Hong Kong Peoples R China|City Univ Hong Kong Shenzhen Res Inst Shenzhen Peoples R China;

    Univ New South Wales Ctr Infrastruct Engn & Safety Sch Civil & Environm Engn Sydney NSW Australia;

    City Univ Hong Kong Dept Architecture & Civil Engn Hong Kong Peoples R China;

  • 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

    deformation; fabric/structure of soils; numerical modelling; particle-scale behaviour; shear strength;

    机译：变形;织物/结构的土壤;数值模型;粒子尺度行为;剪切强度;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号