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Exploring the micromechanics of non-active clays by way of virtual DEM experiments

机译：通过虚拟DEM实验探索非活性黏土的微力学

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摘要

The micromechanical behaviour of clays cannot be investigated experimentally in a direct fashion due to the small size of clay particles. An insight into clay mechanical behaviour at the particle scale can be gained by way of virtual experiments based on the discrete-element method (DEM). So far, most DEM models for clays have been designed on the basis of theoretical formulations of inter-particle interactions, with limited experimental evidence of their actual control over the clay's macroscopic response. This paper presents a simplified two-dimensional DEM framework where contact laws were inferred from indirect experimental evidence at the microscale provided by Pedrotti and Tarantino in 2017 (particle-to-particle interactions were probed experimentally by varying the pore-fluid chemistry, and the resulting effect was explored by way of scanning electron microscopy and mercury intrusion porosimetry). The proposed contact laws were successfully tested against their ability to reproduce qualitatively the compression behaviour of clay with pore fluids of varying pH and dielectric permittivity. The DEM framework presented in this work was intentionally kept simple in order to demonstrate the robustness of the micromechanical concept underlying the proposed contact laws. It is anticipated that a satisfactory quantitative prediction would be achieved by moving to a three-dimensional formulation, by considering polydisperse specimens and by refining the contact laws.
机译：由于粘土颗粒的尺寸很小，因此不能以直接的方式对粘​​土的微力学行为进行实验研究。可以通过基于离散元素方法（DEM）的虚拟实验来了解粘土在颗粒尺度上的力学行为。到目前为止，大多数粘土的DEM模型是基于颗粒间相互作用的理论公式设计的，仅有有限的实验证据表明它们可以实际控制粘土的宏观响应。本文提出了一种简化的二维DEM框架，其中根据Pedrotti和Tarantino在2017年提供的微观尺度上的间接实验证据推断了接触定律（通过改变孔隙流体化学性质来实验性地探索了颗粒间的相互作用，并得出了通过扫描电子显微镜和压汞法研究了这种效果。拟议的接触定律已成功测试了其定性再现具有变化的pH和介电常数的孔隙流体的粘土压缩行为的能力。为了证明所提出的接触定律所基于的微机械概念的鲁棒性，有意使这项工作中提出的DEM框架保持简单。可以预期，通过转向三维公式，考虑多分散样品并细化接触定律，可以获得令人满意的定量预测。

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  • 来源
    《Geotechnique》 |2020年第4期|303-316|共14页
  • 作者

  • 作者单位

    Univ Strathclyde Dept Civil & Environm Engn Glasgow Lanark Scotland;

    Univ Twente Multiscale Mech Grp Enschede Netherlands;

  • 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

    clays; compressibility; discrete-element modelling; particle-scale behaviour;

    机译：黏土可压缩性离散元素建模;粒子尺度行为;

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