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多雨地区双块式无砟轨道湿态混凝土力学性能

杨荣山 李莹 许钊荣 刘佳

杨荣山, 李莹, 许钊荣, 刘佳. 多雨地区双块式无砟轨道湿态混凝土力学性能[J]. 西南交通大学学报, 2022, 57(4): 840-847. doi: 10.3969/j.issn.0258-2724.20210440
引用本文: 杨荣山, 李莹, 许钊荣, 刘佳. 多雨地区双块式无砟轨道湿态混凝土力学性能[J]. 西南交通大学学报, 2022, 57(4): 840-847. doi: 10.3969/j.issn.0258-2724.20210440
YANG Rongshan, LI Ying, XU Zhaorong, LIU Jia. Mechanical Properties of Wet Concrete Inside Double-Block Ballastless Tracks in Rainy Areas[J]. Journal of Southwest Jiaotong University, 2022, 57(4): 840-847. doi: 10.3969/j.issn.0258-2724.20210440
Citation: YANG Rongshan, LI Ying, XU Zhaorong, LIU Jia. Mechanical Properties of Wet Concrete Inside Double-Block Ballastless Tracks in Rainy Areas[J]. Journal of Southwest Jiaotong University, 2022, 57(4): 840-847. doi: 10.3969/j.issn.0258-2724.20210440

多雨地区双块式无砟轨道湿态混凝土力学性能

doi: 10.3969/j.issn.0258-2724.20210440
基金项目: 国家自然科学基金(51778543,51978584)
详细信息
    作者简介:

    杨荣山(1975—),男,教授,研究方向为轨道结构与轨道动力学,E-mail:yrs@home.swjtu.edu.cn

  • 中图分类号: V221.3

Mechanical Properties of Wet Concrete Inside Double-Block Ballastless Tracks in Rainy Areas

  • 摘要:

    长期处于水环境中的双块式无砟轨道内部存在不均匀的湿度场,而湿度会对轨道结构的力学性能产生一定的影响. 为研究水环境中双块式无砟轨道内部不同湿度状态下混凝土宏观力学性能,结合水环境中双块式无砟轨道的湿度分布情况,建立了混凝土基质纳观组分(C-S-H)分子动力学模型,对混凝土基质展开多尺度计算,并进行两级均匀化分析. 结果表明:水环境中的双块式无砟轨道结构表层湿度的梯级分化明显,轨道内部的湿度差最高可达38.41%;混凝土的弹性模量和泊松比随饱和度的增加而增大;混凝土饱和度由0增加到100.00%时,支承层、道床板及轨枕混凝土弹性模量的增幅分别可达35.0%、19.5%、16.2%.

     

  • 图 1  双块式无砟轨道湿度场的二维有限元模型

    Figure 1.  Two-dimensional finite element model ofhumidity field in double-block ballastless tracks

    图 2  水环境中湿度场分布

    Figure 2.  Distribution of humidity field in sleeper area in water environment

    图 3  混凝土基质的多尺度模型

    Figure 3.  Multi-scale model of concrete matrix

    图 4  干燥状态下的硅酸盐骨架结构

    Figure 4.  Silicate skeleton structure in dry state

    图 5  弛豫后的C-S-H分子模型

    Figure 5.  C-S-H molecular model after relaxation

    表  1  双块式无砟轨道构件尺寸及材料参数

    Table  1.   Dimensions and material parameters of double-block ballastless track components

    构件参数取值
    C60 混凝土轨枕块水灰比0.32
    长、宽、高/mm800、300、150
    密度(kg·m−32500
    C40 混凝土道床板水灰比0.38
    宽、高/mm2800、260
    密度/(kg·m−32450
    C20 混凝土支承层水灰比0.66
    宽、高/mm3400、300
    密度/(kg·m−32300
    下载: 导出CSV

    表  2  水环境中双块式无砟轨道湿度区间及其代表值

    Table  2.   Humidity interval and representative values of double-block ballastless tracks in water environment %

    湿度
    区间
    轨枕区域枕间区域
    湿度代表湿度湿度代表
    湿度
    1[61.59,65.85]64.00[65.80,69.60]68.00
    2(65.85,70.12]68.00(69.60,73.40]72.00
    3(70.12,74.39]72.00(73.40,77.20]75.00
    4(74.39,78.66]77.00(77.20,81.00]79.00
    5(78.66,82.93]81.00(81.00,84.80]83.00
    6(82.93,87.20]85.00(84.80,88.60]87.00
    7(87.20,91.46]89.00(88.60,92.40]91.00
    8(91.46,95.73]94.00(92.40,96.20]94.00
    9(95.73,100.00]98.00(96.20,100.00]98.00
    下载: 导出CSV

    表  3  各层级两相复合材料的具体组分

    Table  3.   Specific components of two-phase composite at each level

    研究
    对象
    层级两相
    复合材料
    夹杂相基质相
    C-S-H
    凝胶
    HD/LD
    C-S-H
    凝胶孔及
    内部水
    C-S-H 胶束
    C-S-H 凝胶LD/HD
    C-S-H
    HD/LD
    C-S-H
    硬化水泥浆体骨架水化产物CH 晶体C-S-H 凝胶
    硬化水泥浆体骨架未水化
    水泥颗粒
    水化产物
    水泥砂浆骨架水泥砂浆骨架细骨料硬化水泥
    浆体骨架
    混凝土基质混凝土基质粗骨料水泥砂浆骨架
    下载: 导出CSV

    表  4  各层级夹杂相的力学参数

    Table  4.   Mechanical parameters of inclusion at each level

    层级夹杂相弹性模量
    E/GPa
    体积
    模量/GPa
    剪切
    模量/GPa
    泊松比
    υ
    饱和凝胶孔 2.200
    非饱和
    凝胶孔
    0 0
    CH晶体40.00160.00
    未水化
    水泥颗粒
    135.000.27
    细骨料 34.600.21
    粗骨料 54.000.20
    下载: 导出CSV

    表  5  C-S-H胶束力学性能参数

    Table  5.   Mechanical properties of C-S-H micelles

    项目 体积模量/GPa 剪切模量/GPa E/GPa υ
    本文 39.81 22.46 56.71 0.26
    文献[32-33] 31.83 ~ 49.00 19.10 ~ 23.00 47.75 ~ 65.00 0.25 ~ 0.30
    下载: 导出CSV

    表  6  混凝土基质等效力学参数计算结果

    Table  6.   Calculation results of equivalent mechanical parameters for concrete matrix

    混凝土强度等级湿度/%等效体积模量/GPa等效剪切模量/GPa等效弹性模量/GPaυ
    C2064.00 ~ 98.0024.5916.1239.690.23
    C4064.0027.0017.0142.170.24
    68.0027.0917.0042.180.24
    72.00 ~ 98.0027.2016.9442.090.24
    C6064.0027.4717.0242.310.24
    68.0027.5317.0342.370.24
    72.0027.6717.0342.390.24
    75.00 ~ 98.0027.7616.9942.330.25
    下载: 导出CSV

    表  7  轨枕区域不同湿度状态混凝土的有效力学参数

    Table  7.   Effective mechanical parameters of concrete in different humidity states in track-sleeper areas

    湿度区间代表湿度/%C20 混凝土(支承层)C40 混凝土(道床板)C60 混凝土(轨枕)
    S/%E/GPaυS/%E/GPaυS/%E/GPaυ
    1 64.00 0.05 24.71 0.22 0 29.43 0.22 0 30.91 0.23
    2 68.00 0.11 24.71 0.22 0 29.43 0.23 0 30.91 0.23
    3 72.00 0.21 24.71 0.22 0.30 29.44 0.23 0 30.91 0.23
    4 77.00 0.51 26.72 0.22 2.54 29.66 0.23 10.67 31.60 0.23
    5 81.00 1.16 28.74 0.23 6.88 29.94 0.23 36.06 32.56 0.23
    6 85.00 3.32 28.93 0.23 17.83 30.85 0.23 70.36 33.38 0.23
    7 89.00 13.78 29.91 0.23 45.16 32.16 0.23 81.53 34.34 0.23
    8 94.00 79.17 31.43 0.24 79.84 34.03 0.24 81.60 35.89 0.23
    9 98.00 100.00 33.35 0.25 100.00 35.17 0.24 100.00 35.93 0.23
    下载: 导出CSV

    表  8  枕间区域不同湿度状态混凝土的有效力学参数

    Table  8.   Effective mechanical parameters of concrete in different humidity states in areas between sleepers

    湿度区间代表湿度/%C20 混凝土(支承层)C40 混凝土(道床板)
    S/%E/GPaυS/%E/GPaυ
    1 68.00 0.11 24.71 0.22 0 29.43 0.22
    2 72.00 0.21 24.71 0.22 0.30 29.44 0.23
    3 75.00 0.35 24.71 0.22 1.39 29.55 0.23
    4 79.00 0.75 26.72 0.22 4.25 29.77 0.23
    5 83.00 1.89 28.74 0.23 11.06 30.11 0.23
    6 87.00 6.41 29.36 0.23 28.73 30.91 0.23
    7 91.00 31.88 30.91 0.23 64.92 32.84 0.23
    8 94.00 79.17 31.43 0.24 79.84 34.03 0.24
    9 98.00 100.00 33.35 0.25 100.00 35.17 0.24
    下载: 导出CSV
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  • 收稿日期:  2020-05-27
  • 修回日期:  2021-09-10
  • 刊出日期:  2021-09-13

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