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Mechanical behavior and deformation mechanism of ballast bed with various fouling materials

考虑脏污材质的有砟道床力学行为及变形机理

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Abstract

In order to study the interaction between various fouling particles and ballast, a multi-layer and multi-scale discrete element model (DEM) including the sleeper, ballast bed and the surface layer of subgrade was developed. Two typical fouling particles, the hard particles (sand) and soft ones (coal fines), are considered. A support stiffness test of the ballast bed under various fouling conditions was conducted to calibrate the microscopic parameters of the contact model. With the model, the influence of fouling particles on the mechanical behavior and deformation of the ballast bed was analyzed from macro and micro perspectives. The results show that the increase in the strength of the fouling particles enlarges the stiffness of the ballast bed. Hard particles increase the uniformity coefficient of the contact force bond γ of ballast by 50.4%. Fouling particles increase the average stress in the subgrade, soft particles by 2 kPa and hard particles by 1 kPa. Hard particles can reduce the elasticity, plastic deformation and energy dissipation in the track structure. As the fouling particle changes from hard to soft, the proportion of the settlement in ballast bed increases to 40.5% and surface layer of swbgrade settlement decreases to 59.5%. Thus, the influence of fouling particles should be considered carefully in railway design and maintenance.

摘要

为研究脏污颗粒材质与道砟颗粒之间的相互作用机理, 选用硬(沙粒)、 软(煤灰)两种典型脏污颗 粒建立了轨枕-道床-基床表层多层多尺度离散元模型, 开展了不同脏污条件下道床支撑刚度试验, 标 定了接触模型的微观参数. 在此基础上, 从宏观微观角度分析了脏污颗粒材质对道床力学行为及变形 特性的影响. 结果表明, 脏污颗粒**度的提高, 使道床支撑刚度增大;脏污颗粒使枕侧力链萌生, 接 触力链扩散角度减小, 且硬颗粒使道砟接触力键均匀系数γ 提高了约50.4%;脏污颗粒使基床表层**均 应力增大, 软颗粒使其**均应力增加了2 kPa, 而硬颗粒使其**均应力增加了1 kPa;硬颗粒可以有效 抑制道砟颗粒位移, 使轨道结构弹性、 塑性变形和耗散能Ud均减小;随着脏污颗粒材质由硬到软, 道 床沉降所占比例增大到约40.5%, 路基表层减小到约59.5%. 因此, 建议铁路线路养护维修时应考虑脏 污颗粒材质的影响, 制定不同养护维修策略, 以提高养护维修效率.

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Correspondence to Hong **ao  (肖宏).

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Foundation item

Project(51978045) supported by the National Natural Science Foundation of China; Project([2017]7) supported by Shenshuo Science and Technology Development Project, China

Contributors

ZHANG Zhi-hai provided the concept and edited the draft of manuscript. XIAO Hong provided test data. WANG Meng and LIU Guangpeng analyzed the measured data. ZHANG Zhi-hai and WANG Hao-yu analyzed the calculated results. ZHANG Zhi-hai, XIAO Hong and LIU Guang-peng wrote the initial draft of the manuscript. All authors replied to reviewers’ comments and revised the final version.

Conflict of interest

ZHANG Zhi-hai, XIAO Hong, WANG Meng, LIU Guang-peng, and WANG Hao-yu declare that they have no conflict of interest.

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Zhang, Zh., **ao, H., Wang, M. et al. Mechanical behavior and deformation mechanism of ballast bed with various fouling materials. J. Cent. South Univ. 28, 2857–2874 (2021). https://doi.org/10.1007/s11771-021-4812-9

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