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基于缩尺试验和离散元模拟的X形轨枕承载特性

陈成 汤语嫣 唐子桉 张磊 杨超

陈成, 汤语嫣, 唐子桉, 张磊, 杨超. 基于缩尺试验和离散元模拟的X形轨枕承载特性[J]. 西南交通大学学报. doi: 10.3969/j.issn.0258-2724.20230590
引用本文: 陈成, 汤语嫣, 唐子桉, 张磊, 杨超. 基于缩尺试验和离散元模拟的X形轨枕承载特性[J]. 西南交通大学学报. doi: 10.3969/j.issn.0258-2724.20230590
CHEN Cheng, TANG Yuyan, TANG Zian, ZHANG Lei, YANG Chao. Bearing Characteristics of X-Shaped Sleeper Based on Scaled Test and Discrete Element Simulation[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20230590
Citation: CHEN Cheng, TANG Yuyan, TANG Zian, ZHANG Lei, YANG Chao. Bearing Characteristics of X-Shaped Sleeper Based on Scaled Test and Discrete Element Simulation[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20230590

基于缩尺试验和离散元模拟的X形轨枕承载特性

doi: 10.3969/j.issn.0258-2724.20230590
基金项目: 国家自然科学基金(51708438, 52178353)
详细信息
    作者简介:

    陈成(1987—),男,副教授,博士,研究方向为有砟轨道沉降及离散元数值模拟,E-mail:chengchen87@whut.edu.cn

    通讯作者:

    张磊(1983—),男,副教授,博士,研究方向为土-结构相互作用,E-mail:zhangleigeo@whut.edu.cn

  • 中图分类号: U213.31

Bearing Characteristics of X-Shaped Sleeper Based on Scaled Test and Discrete Element Simulation

  • 摘要:

    为研究新型X形轨枕道床承载力和横向阻力特性,开展X形轨枕与Ⅲ型轨枕道床刚度和横向阻力的缩尺模型试验,通过离散元法建立有砟轨道三维模型,并从细观上对比分析2种轨枕道床的竖向荷载传递机制及横向阻力. 研究结果表明:在最大竖向荷载时,X形轨枕道床的竖向位移(刚度)相较于Ⅲ型轨枕降低了约26.3%(提高了约46.6%);与Ⅲ型轨枕相比,X形轨枕的横向极限阻力提高了约22.4%,有效提高了轨道横向稳定性; X形轨枕与枕间道砟的接触面积和应力均明显增加,轨枕接触力沿X形4个夹角范围扩散,使得枕间道砟充分参与分担荷载;由于X形轨枕的叉形结构能够提升枕间道砟的参与,使得道床刚度和横向阻力分别提升约29.2%和31.6%,与试验结论较接近.

     

  • 图 1  3D打印轨枕模型

    Figure 1.  3D printed sleeper model

    图 2  缩尺模型试验的道砟粒径分布

    Figure 2.  Ballast particle size distribution in scaled test

    图 3  有砟轨道缩尺模型

    Figure 3.  Scale model of ballast track

    图 4  轨枕排竖向静载试验

    Figure 4.  Vertical static load test of sleeper panel

    图 5  轨枕排横向阻力试验

    Figure 5.  Lateral resistance test of sleeper panel

    图 6  轨枕竖向荷载-沉降关系

    Figure 6.  Relationship between vertical load and settlement of sleeper

    图 7  轨枕的道床刚度对比

    Figure 7.  Comparison of trackbed stiffness of sleeper

    图 8  轨枕横向荷载-位移

    Figure 8.  Lateral load-displacement of sleeper

    图 9  轨枕横向加载全过程

    Figure 9.  Lateral loading process of sleeper

    图 10  平均横向荷载-轨枕位移关系和横向极限阻力

    Figure 10.  Relationship between average lateral load and displacement of sleeper and ultimate lateral resistance

    图 11  道砟颗粒模型和休止角试验标定

    Figure 11.  Ballast praticle model and validation of repose angle test

    图 12  不同轨枕的离散元道床模型对比

    Figure 12.  Comparison of trackbed models of different sleepers by discrete element

    图 13  缩尺试验与缩尺模拟结果对比

    Figure 13.  Comparison of scaled tests and simulation results

    图 14  道床竖向承载力

    Figure 14.  Track bed vertical loading-displacement curve

    图 15  竖向荷载下道床内部接触力分布

    Figure 15.  Contact force distribution inside trackbed under vertical load

    图 16  道床横向阻力-位移曲线

    Figure 16.  Lateral resistance-displacement curve of trackbed

    图 17  道床横向阻力组成对比

    Figure 17.  Comparison of lateral resistance component of trackbed

    图 18  道床内部接触力分布

    Figure 18.  Contact force distribution inside trackbed

    表  1  3D打印材料(PLA)参数

    Table  1.   3D printing material (PLA) parameters

    参数 线径/mm 密度/(g·cm−3 熔点/(℃) 拉伸强度/MPa 断裂伸长率/% 弹性模量/MPa
    取值 1.75 1.26 176 48 7 3500
    下载: 导出CSV

    表  2  缩尺试验相似数值

    Table  2.   Similarity parameters of scaled test

    物理量 相似关系 相似常数
    长度/位移/m CL 8.7
    道砟密度/(kg·m−3 Cρ 1.0
    内摩擦角 Cφ 1.0
    轨枕弹性模量/MPa CE 10.3
    轨枕集中荷载/N CF=CECL2 779.6
    下载: 导出CSV

    表  3  模型物理参数与接触参数

    Table  3.   Physical and contact parameters of model

    模型部件 泊松比 剪切模量/
    (×1010 Pa)
    密度/ (kg·m−3 摩擦系数
    道砟 0.30 2.0 2700 0.55
    轨枕 0.23 1.5 2800 0.85
    钢轨 0.23 1.5 7800 0.85
    下载: 导出CSV
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出版历程
  • 收稿日期:  2023-11-07
  • 修回日期:  2024-04-26
  • 网络出版日期:  2024-09-14

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