基于可破碎离散单元的铁路碎石道砟磨耗机制研究

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英文篇名：Research of Wear Mechanism of Railway Ballast Based on Crushable Discrete Element 作者：徐旸 ; 高亮 ; 杨国涛 ; 侯博文 ; 殷浩 英文作者：XU Yang;GAO Liang;YANG Guotao;HOU Bowen;YIN Hao;Railway Engineering Research Institution,China Academy of Railway Sciences Corporation Limited;School of Civil Engineering,Beijing Jiaotong University; 关键词：铁路碎石道砟 ; 三维激光扫描 ; 离散元法 ; 磨耗性能 英文关键词：railway ballast;;three-dimensional laser scanner;;discrete element method;;wear-resisting property 中文刊名：TDXB 英文刊名：Journal of the China Railway Society 机构：中国铁道科学研究院集团有限公司铁道建筑研究所;北京交通大学土木建筑工程学院; 出版日期：2019-02-15 出版单位：铁道学报 年：2019 期：v.41;No.256 基金：国家自然科学基金(51808556,51808557);; 中国铁路总公司科技研究开发计划(N2018G041) 语种：中文; 页：TDXB201902018 页数：6 CN：02 ISSN：11-2104/U 分类号：128-133

摘要

采用三维激光扫描技术,提出基于真实颗粒外形的可破碎道砟单元构造方法,在此基础上通过离散元法建立洛杉矶磨耗试验的精细化数值仿真模型;结合室内试验结果对数值模型进行标定与验证,重点研究《TB/T 2140—2008铁路碎石道砟》中规定的针、片状道砟颗粒对道砟集料在循环荷载作用下劣化演化机制及动力特性的影响规律。结果表明:针状道砟颗粒会严重削弱道砟集料的整体耐磨性能,且极易发生转动;片状颗粒对道砟集料的整体耐磨性能影响不明显,且在循环荷载作用下具有较好的动态稳定性。仅就道砟的磨耗性能而言,建议相关规范在规定针、片状颗粒含量时综合考虑整体耐磨性能和动态稳定性。
        Using three-dimensional laser scanning technology,a construction method of crushable railway ballast discrete element based on real ballast shape was proposed.A refined numerical simulation model of Los Angeles Abrasion test was built with discrete element method.The results of laboratory experiment were used to verify the numerical model.The influence of needle and flaky shape ballast stipulated by industrial standard on wear mechanism and dynamic characteristics of ballast aggregate during cyclic loading was focused during the research.The results show that needle shape ballast not only weakens the wear-resisting property of ballast aggregate observably but also easy to rotate.However,the flaky shape ballast does not have obvious influence on wear-resisting property of ballast aggregate,while it shows good dynamic stability during cyclic loading.As far as the wear-resisting property of ballast is concerned,the wear-resisting property and dynamic stability should be taken into account when the needle and flaky shape ballast rate limit is stipulated in relevant codes.

引文

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