DEM Validation for impact Wave propagation in dry sand: A comparison with experimental results

IF 5.3 1区工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Computers and Geotechnics Pub Date : 2024-11-13 DOI:10.1016/j.compgeo.2024.106901

K Balamonica , Goh Siang Huat

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Abstract

In wave propagation problems, soil is often idealized as a continuum, neglecting its granular nature. Discrete element method (DEM) offers an explicit representation of granular interactions, providing valuable insights into its micro-mechanics. However, previous studies using DEM primarily focused on small-strain scenarios like bender element tests, with limited exploration of transient loads like those resulting from impacts or blasts. This research investigates the capability of DEM for modelling impact wave propagation in dry sand. A dry sand column under 1-D impact loading is simulated using DEM and compared with experimental data. Key characteristics of the wave propagation, such as wave velocity and attenuation, are compared to assess the ability of DEM to capture the dispersive wave and attenuative characteristics of dry sand to transient loads. In addition, the importance of characterising the viscous damping in DEM to model the wave propagation under realistic loading conditions is highlighted.

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干砂中冲击波传播的 DEM 验证：与实验结果的比较

在波传播问题中，土壤通常被理想化为连续体，而忽略了其颗粒性质。离散元法（DEM）明确表示了颗粒的相互作用，为了解颗粒的微观力学提供了宝贵的资料。然而，以往使用 DEM 进行的研究主要集中在弯管元件测试等小应变情况，对冲击或爆炸等瞬态载荷的研究有限。本研究探讨了 DEM 模拟干砂中冲击波传播的能力。使用 DEM 模拟了一维冲击载荷下的干沙柱，并与实验数据进行了比较。对波速和衰减等波传播的主要特征进行比较，以评估 DEM 在捕捉干沙对瞬态荷载的分散波和衰减特征方面的能力。此外，还强调了在 DEM 中描述粘性阻尼的重要性，以模拟实际加载条件下的波传播。

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来源期刊

Computers and Geotechnics 地学-地球科学综合

CiteScore

9.10

自引率

15.10%

发文量

438

审稿时长

45 days

期刊介绍： The use of computers is firmly established in geotechnical engineering and continues to grow rapidly in both engineering practice and academe. The development of advanced numerical techniques and constitutive modeling, in conjunction with rapid developments in computer hardware, enables problems to be tackled that were unthinkable even a few years ago. Computers and Geotechnics provides an up-to-date reference for engineers and researchers engaged in computer aided analysis and research in geotechnical engineering. The journal is intended for an expeditious dissemination of advanced computer applications across a broad range of geotechnical topics. Contributions on advances in numerical algorithms, computer implementation of new constitutive models and probabilistic methods are especially encouraged.