Influence of particle size distribution and normal pressure on railway ballast: A DEM approach

Z. Yan, Ali Zaoui, W. Sekkal
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Abstract

Developing the railway transport sector is a challenging scientific, economic and social research topic starting with ensuring human security. The main topic that should be developed in that sense is the ballast stability and dynamical behaviour under external loading and environmental changes. This paper investigates the effect of particle size distribution and normal pressure on the mechanical response of a ballast bed. Grading curves of ballast layers with different sizes are illustrated to discuss their strength behaviour under various strains to deduce the significant effect on the direct shear performance of the ballast layer. Direct shear tests with different Particle Size Distribution (PSD) were reproduced using the Discrete Element Method (DEM). It is noticed that when the number of small-sized ballast increases, the shear strength and the friction angle increase to varying degrees under different normal pressures, with an average increase of 27 % and 8 %, respectively. When the number of large-sized ballast decreases, the shear strength and the friction angle decrease to varying degrees under different normal pressures, with an average decrease of 6 % and 3 %, respectively.
铁路道砟颗粒粒度分布和正压对其影响的DEM方法
发展铁路运输业是一个具有挑战性的科学、经济和社会研究课题,从保障人类安全开始。在这个意义上应该发展的主要课题是压舱物在外部载荷和环境变化下的稳定性和动力特性。本文研究了粒径分布和正压对压载床力学响应的影响。绘制了不同尺寸的压载层级配曲线,讨论了不同应变下压载层的强度特性,从而推导出压载层的直剪性能对压载层的显著影响。采用离散元法(DEM)再现了不同粒径分布(PSD)的直剪试验。结果表明,随着小型压载体数量的增加,不同法向压力下的抗剪强度和摩擦角均有不同程度的增加,平均增加幅度分别为27. %和8. %。当大型压载物数量减少时,不同法向压力下的抗剪强度和摩擦角均有不同程度的减小,平均减小幅度分别为6 %和3 %。
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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