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弹射冲击荷载下重载铁路路基动位移空间分布特征

尹紫红 朱仁政 邱泓滔 王青松

尹紫红, 朱仁政, 邱泓滔, 王青松. 弹射冲击荷载下重载铁路路基动位移空间分布特征[J]. 西南交通大学学报, 2021, 56(4): 777-784. doi: 10.3969/j.issn.0258-2724.20191106
引用本文: 尹紫红, 朱仁政, 邱泓滔, 王青松. 弹射冲击荷载下重载铁路路基动位移空间分布特征[J]. 西南交通大学学报, 2021, 56(4): 777-784. doi: 10.3969/j.issn.0258-2724.20191106
YIN Zihong, ZHU Renzheng, QIU Hongtao, WANG Qingsong. Spatial Distribution Characteristics of Dynamic Displacement of Heavy-Haul Railway Subgrade System under Launching Impact Load[J]. Journal of Southwest Jiaotong University, 2021, 56(4): 777-784. doi: 10.3969/j.issn.0258-2724.20191106
Citation: YIN Zihong, ZHU Renzheng, QIU Hongtao, WANG Qingsong. Spatial Distribution Characteristics of Dynamic Displacement of Heavy-Haul Railway Subgrade System under Launching Impact Load[J]. Journal of Southwest Jiaotong University, 2021, 56(4): 777-784. doi: 10.3969/j.issn.0258-2724.20191106

弹射冲击荷载下重载铁路路基动位移空间分布特征

doi: 10.3969/j.issn.0258-2724.20191106
基金项目: 国家重点研发计划(VP99QT136Y17001)
详细信息
    作者简介:

    尹紫红(1971—),男,副教授,博士,研究方向为道路与铁道工程,E-mail:71yzh@163.com

  • 中图分类号: U239.4; E956

Spatial Distribution Characteristics of Dynamic Displacement of Heavy-Haul Railway Subgrade System under Launching Impact Load

  • 摘要: 为研究军用重载铁路路基动响应空间分布特征,通过高度非线性分析程序ANSYS/LS-DYNA3D建立了重载铁路轨道-路基-地基三维显式动力分析模型,并引入三维一致黏弹性人工边界;采用梯形冲击荷载模拟弹射冲击,探讨了不同幅值(150~600 kN)的弹射冲击荷载作用时重载铁路路基系统动位移的空间分布特征,通过Boussinesq弹性理论与林绣贤多层系统当量理论验证了数值模型的可靠性. 结果分析表明:当作用在轨道上的弹射荷载开始进入卸载状态时,路基系统的竖向动位移达到最大值;结束卸载时,道床顶面存在一定量的残余变形,且残余变形随荷载幅值增长呈线性增长,增长速率约为0.60 × 10−2 mm/kN;在不同荷载幅值下路基动位移沿线路横、纵向均呈对称分布,动位移沿竖向近似呈直线型衰减,且衰减速率随着荷载幅值的增加而增大;荷载幅值越大,路基动位移的轮对效应及道床和基床对钢轨动力的分担作用均越来越显著;路基的动位移峰值与荷载幅值大致呈线性关系,道床顶面的动位移峰值随荷载幅值增长最快,增长速率约为1.27 × 10−2 mm/kN,基床表层与基床底层次之,增长速率分别约为1.23 × 10−2、1.20 × 10−2 mm/kN,路基本体增长最慢,增长速率约为1.10 × 10−2 mm/kN.

     

  • 图 1  动应力计算位置

    Figure 1.  Calculation position of dynamic stress

    图 2  竖向动位移时程曲线

    Figure 2.  Time history of vertical dynamic displacement

    图 3  道床顶面动位移空间分布

    Figure 3.  Spatial distribution of dynamic displacement of ballast bed surface.

    图 4  路基各结构层顶面动位移沿纵向的分布

    Figure 4.  Longitudinal distribution of dynamic displacement along the line

    图 5  不同位置各结构层动位移与荷载幅值的关系

    Figure 5.  Relationship between dynamic displacement at different positions and load amplitude

    图 6  动位移差值与荷载幅值的关系曲线

    Figure 6.  Relationship between dynamic displacement difference and load amplitude

    图 7  路基各结构层顶面动位移沿横向的分布

    Figure 7.  Lateral distribution of dynamic displacement along the line

    图 8  不同位置各结构层动位移与荷载幅值的关系

    Figure 8.  Relationship between dynamic displacement at different positions and load amplitude

    图 9  动位移差值与荷载幅值的关系曲线

    Figure 9.  Relationship between dynamic displacement difference and load amplitude

    图 10  不同荷载工况下竖向动位移沿深度的分布

    Figure 10.  Distribution of dynamic displacement along depth under different load conditions

    表  1  不同荷载工况下路基的动位移峰值

    Table  1.   Peak dynamic displacements of subgrade under different load conditions mm

    结构层150 kN200 kN300 kN400 kN500 kN600 kN
    道床表层1.92382.57023.81825.08296.35277.6513
    基床表层1.86132.48383.68944.91326.14187.3952
    基床底层1.81932.42803.60744.80306.00487.2288
    路基本体1.66602.21793.29574.39215.49176.6061
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  • 收稿日期:  2019-11-16
  • 修回日期:  2020-01-07
  • 网络出版日期:  2021-01-21
  • 刊出日期:  2021-08-15

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