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针片状指数对道砟直剪力学特性的影响

井国庆 强伟乐 常锦秀 李旭

井国庆, 强伟乐, 常锦秀, 李旭. 针片状指数对道砟直剪力学特性的影响[J]. 西南交通大学学报, 2020, 55(4): 688-694. doi: 10.3969/j.issn.0258-2724.20180677
引用本文: 井国庆, 强伟乐, 常锦秀, 李旭. 针片状指数对道砟直剪力学特性的影响[J]. 西南交通大学学报, 2020, 55(4): 688-694. doi: 10.3969/j.issn.0258-2724.20180677
JING Guoqing, QIANG Weile, CHANG Jinxiu, LI Xu. Effect of Flakiness-Elongation Index on Shear Behavior of Railway Ballast[J]. Journal of Southwest Jiaotong University, 2020, 55(4): 688-694. doi: 10.3969/j.issn.0258-2724.20180677
Citation: JING Guoqing, QIANG Weile, CHANG Jinxiu, LI Xu. Effect of Flakiness-Elongation Index on Shear Behavior of Railway Ballast[J]. Journal of Southwest Jiaotong University, 2020, 55(4): 688-694. doi: 10.3969/j.issn.0258-2724.20180677

针片状指数对道砟直剪力学特性的影响

doi: 10.3969/j.issn.0258-2724.20180677
基金项目: 国家自然科学基金资助项目(51578051,51578053)
详细信息
    作者简介:

    井国庆(1979—),男,副教授,博士生导师,研究方向为道路与铁道工程,E-mail:gqjing@bjtu.edu.cn

  • 中图分类号: TU458.3

Effect of Flakiness-Elongation Index on Shear Behavior of Railway Ballast

  • 摘要: 为研究针片状道砟在破碎情况下对道砟散体直剪力学特性的影响,通过进行不同工况下道砟直剪试验,从道砟散体剪切强度、变形及破碎特性对试验结果进行分析. 研究结果表明:(1) 随着针片状指数增加,道砟散体直剪力学性能下降,包括抗剪强度和内摩擦角(100 kPa下当针状指数由0分别提高到20%、40%时,抗剪强度分别降低10.9%、16.8%;片状指数由0分别提高到20%、40%时,抗剪强度分别降低14.7%、22.3%;针、片状道砟总值由0分别提高到20%、40%时,抗剪强度分别降低12.4%、18.9%). (2) 随着针片状道砟含量增加,试样剪缩和剪胀量均降低. (3) 针片状道砟在直剪试验过程中易于发生破碎,且破碎类型多为整体断裂并伴随尖角破碎折断,显著影响有砟道床维修周期.

     

  • 图 1  道砟级配曲线

    Figure 1.  Gradation curves for railway ballast

    图 2  试验样本

    Figure 2.  Test samples

    图 3  试验计划

    Figure 3.  Test plan

    图 4  直剪试验装置及试验过程

    Figure 4.  Equipment and process of direct shear test

    图 5  应力-应变曲线及含量对抗剪强度的影响

    Figure 5.  Stress-strain curve and influence of content on shear strength

    图 6  20%针/片/针片状指数下剪切强度特性

    Figure 6.  Shear strength characteristics of EI/FI/FEI (20%)

    图 7  100 kPa下道砟试样垂向变形特性

    Figure 7.  Vertical deformation characteristics of ballast sample at 100 kPa

    图 8  道砟破碎情况

    Figure 8.  Railway ballast breakage condition

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出版历程
  • 收稿日期:  2018-08-10
  • 修回日期:  2018-09-30
  • 网络出版日期:  2020-03-11
  • 刊出日期:  2020-08-01

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