Validation and calibration of soil parameters based on EEPA contact model

IF 2.8 3区工程技术 Q1 MATHEMATICS, INTERDISCIPLINARY APPLICATIONS

Computational Particle Mechanics Pub Date : 2023-02-24 DOI:10.1007/s40571-023-00559-0

Long Zhou, Yubin Lan, Jianqun Yu, Yang Wang, Dongxu Yan, Kai Sun, Wenjun Wang, Yulong Chen

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引用次数: 2

Abstract

The determination of parameters is a key issue in discrete element simulation and controls the accuracy and reliability of the simulation results. In this paper, a sandy loam soil with three water contents is studied and soil particles based on the EEPA model are modelled in three shapes (spheres, columns and Triangular pyramid) to accurately represent the actual soil particle. The sensitivity of the input parameters in the EEPA model is investigated by the Plackett–Burman test. The results show that the coefficient of static friction, coefficient of rolling friction and surface energy between soil particles have a highly significant effect on the angle of repose, and the coefficient of restitution has a significant effect on the angle of repose. The sensitivity parameters are calibrated by the central combination test, and the optimal combination of parameters is obtained. The accuracy of the parameters calibrated is validated by comparing the simulation results of the direct shear test with the actual test results. Therefore, the parameters calibrated satisfy both the flow and mechanical properties of the particles.

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基于EEPA接触模型的土壤参数验证与标定

参数的确定是离散元仿真的关键问题，控制着仿真结果的准确性和可靠性。本文以三种含水量的砂壤土为研究对象，基于EEPA模型对土壤颗粒进行了三种形状(球体、圆柱和三角金字塔)的建模，以准确表征实际土壤颗粒。通过Plackett-Burman检验研究了EEPA模型中输入参数的敏感性。结果表明:土粒间静摩擦系数、滚动摩擦系数和表面能对休止角有极显著的影响，恢复系数对休止角有显著的影响。通过中心组合试验对灵敏度参数进行了标定，得到了灵敏度参数的最优组合。通过直剪试验模拟结果与实际试验结果的对比，验证了标定参数的准确性。因此，校准的参数既满足颗粒的流动性能，也满足颗粒的力学性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Computational Particle Mechanics Mathematics-Computational Mathematics

CiteScore

5.70

自引率

9.10%

发文量

期刊介绍： GENERAL OBJECTIVES: Computational Particle Mechanics (CPM) is a quarterly journal with the goal of publishing full-length original articles addressing the modeling and simulation of systems involving particles and particle methods. The goal is to enhance communication among researchers in the applied sciences who use "particles'''' in one form or another in their research. SPECIFIC OBJECTIVES: Particle-based materials and numerical methods have become wide-spread in the natural and applied sciences, engineering, biology. The term "particle methods/mechanics'''' has now come to imply several different things to researchers in the 21st century, including: (a) Particles as a physical unit in granular media, particulate ﬂows, plasmas, swarms, etc., (b) Particles representing material phases in continua at the meso-, micro-and nano-scale and (c) Particles as a discretization unit in continua and discontinua in numerical methods such as Discrete Element Methods (DEM), Particle Finite Element Methods (PFEM), Molecular Dynamics (MD), and Smoothed Particle Hydrodynamics (SPH), to name a few.