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黏土脏污对道砟集料的应力-剪胀关系影响

陈静 高睿 刘洋泽鹏 石知政 张荣隆

陈静, 高睿, 刘洋泽鹏, 石知政, 张荣隆. 黏土脏污对道砟集料的应力-剪胀关系影响[J]. 西南交通大学学报, 2022, 57(6): 1201-1207. doi: 10.3969/j.issn.0258-2724.20200627
引用本文: 陈静, 高睿, 刘洋泽鹏, 石知政, 张荣隆. 黏土脏污对道砟集料的应力-剪胀关系影响[J]. 西南交通大学学报, 2022, 57(6): 1201-1207. doi: 10.3969/j.issn.0258-2724.20200627
CHEN Jing, GAO Rui, LIU Yangzepeng, SHI Zhizheng, ZHANG Ronglong. Effect of Clay Contamination on Stress-Dilatancy Relationships of Ballast Aggregate[J]. Journal of Southwest Jiaotong University, 2022, 57(6): 1201-1207. doi: 10.3969/j.issn.0258-2724.20200627
Citation: CHEN Jing, GAO Rui, LIU Yangzepeng, SHI Zhizheng, ZHANG Ronglong. Effect of Clay Contamination on Stress-Dilatancy Relationships of Ballast Aggregate[J]. Journal of Southwest Jiaotong University, 2022, 57(6): 1201-1207. doi: 10.3969/j.issn.0258-2724.20200627

黏土脏污对道砟集料的应力-剪胀关系影响

doi: 10.3969/j.issn.0258-2724.20200627
基金项目: 国家自然科学基金(51178358,51878521)
详细信息
    作者简介:

    陈静(1994—),女,博士研究生,研究方向为道路与铁道工程,E-mail:chenjing_whu@hotmail.com

    通讯作者:

    高睿(1975—),男,教授,博士,研究方向为道路与铁道工程,E-mail:gaorui@whu.edu.cn

  • 中图分类号: U213.7

Effect of Clay Contamination on Stress-Dilatancy Relationships of Ballast Aggregate

  • 摘要:

    列车循环荷载下,铁路地基层中的黏土颗粒会逐渐侵入道砟层,降低道床承载性能. 通过开展一系列大型直剪试验,对黏土脏污质污染下的受格栅加筋道砟集料和未受格栅加筋道砟集料的强度及变形发展、应力-剪胀关系进行了研究. 试验结果表明:随着脏污程度的增加,道砟集料在剪切过程中强度及法向变形均降低;干净道砟集料的应力比与剪胀比呈一阶线性关系,而黏土污染的道砟集料塑性增强,在剪应力峰值状态下剪胀比更高而抗剪强度发展缓慢,导致应力比与剪胀比呈二阶多项式关系;高法向压力下,道砟集料具有更低的剪胀比;黏土脏污质的存在会减小道砟集料的变形破坏速率,但降低了集料的抗剪强度,而格栅的加筋作用可弥补由于黏土脏污引起的强度降低.

     

  • 图 1  大型直剪设备

    Figure 1.  Apparatus of large-scale direct shear tests

    图 2  道砟及黏土脏污质级配图

    Figure 2.  Size distribution of ballast and clay fine

    图 3  试验所用材料

    Figure 3.  Materials for the large-scale direct shear test

    图 4  受格栅加筋与未受格栅加筋道砟τsδnδs关系

    Figure 4.  Relationships of shear stress τs vs. shear displacement δs and relationships of normal displacement δn vs. shear displacement δs for geogrid-reinforced and unreinforced ballast

    图 5  τs/σn-δn/δs关系

    Figure 5.  Relationships between τs/σn and δn/δs

    图 6  τs/σn-δn/δs关系曲线

    Figure 6.  Relationships between τs/σn and δn/δs

    表  1  道砟及黏土脏污质工程性能指标表

    Table  1.   Engineering properties of clean ballast and clay fines

    材料比重堆积密度/
    (kg·m−3
    e ωL/
    %
    ωP/
    %
    D50/
    mm
    CuCc
    道砟 2.66 1432 0.858 39.0 1.15 1.75
    黏土 2.70 1178 1.207 42.10 22.40 1.3 24.29 1.34
    下载: 导出CSV

    表  2  格栅参数表

    Table  2.   Mechanical properties of geogrid

    参数规格
    孔径形式 双向孔径 55 mm × 55 mm
    材料 聚丙烯
    2% 应变时抗拉
    强度/(kN·m−1
    11
    5% 应变时抗拉
    强度/(kN·m−1
    15
    峰值抗拉强度/(kN·m−1 30
    屈服点伸长率/% 13
    下载: 导出CSV

    表  3  试样设置情况表

    Table  3.   Details of experimental specimens

    VCI/%试样编号格栅布置黏土质量/kg
    0S1-1格栅加筋
    S1-2
    20S2-1格栅加筋21.70
    S2-2
    40S3-1格栅加筋43.40
    S3-2
    下载: 导出CSV
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出版历程
  • 收稿日期:  2020-09-14
  • 修回日期:  2021-04-21
  • 网络出版日期:  2022-08-03
  • 刊出日期:  2021-04-29

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