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新型桩板结构路基在季节冻土区的适用性

张树明 蒋关鲁 杜登峰 廖祎来 薛元 李安洪

张树明, 蒋关鲁, 杜登峰, 廖祎来, 薛元, 李安洪. 新型桩板结构路基在季节冻土区的适用性[J]. 西南交通大学学报, 2021, 56(3): 541-549. doi: 10.3969/j.issn.0258-2724.20190716
引用本文: 张树明, 蒋关鲁, 杜登峰, 廖祎来, 薛元, 李安洪. 新型桩板结构路基在季节冻土区的适用性[J]. 西南交通大学学报, 2021, 56(3): 541-549. doi: 10.3969/j.issn.0258-2724.20190716
ZHANG Shuming, JIANG Guanlu, DU Dengfeng, LIAO Yilai, XUE Yuan, LI Anhong. Applicability of Novel Pile-Plank Embankment in Seasonally Frozen Regions[J]. Journal of Southwest Jiaotong University, 2021, 56(3): 541-549. doi: 10.3969/j.issn.0258-2724.20190716
Citation: ZHANG Shuming, JIANG Guanlu, DU Dengfeng, LIAO Yilai, XUE Yuan, LI Anhong. Applicability of Novel Pile-Plank Embankment in Seasonally Frozen Regions[J]. Journal of Southwest Jiaotong University, 2021, 56(3): 541-549. doi: 10.3969/j.issn.0258-2724.20190716

新型桩板结构路基在季节冻土区的适用性

doi: 10.3969/j.issn.0258-2724.20190716
基金项目: 国家自然科学基金(51878577);中国铁路总公司重大课题(2016G002-A)
详细信息
    作者简介:

    张树明(1989—),男,博士研究生,研究方向为岩土工程地基处理,E-mail:shumingzsm@my.swjtu.edu.cn

    通讯作者:

    蒋关鲁(1962—),男,教授,博士,研究方向为道路与铁道工程,E-mail:wgljiang@swjtu.edu.cn

  • 中图分类号: TU 47

Applicability of Novel Pile-Plank Embankment in Seasonally Frozen Regions

  • 摘要: 针对莫喀(莫斯科—喀山)高速铁路季节性冻土区路基冻胀病害防治问题,提出了铺设保温板垫层的新型桩板结构路基. 通过对聚苯乙烯泡沫塑料板(EPS)、聚氨酯板(PU)和挤塑聚苯乙烯泡沫塑料板(XPS) 3种保温材料性能的对比分析,发现新型桩板结构路基中的保温板可采用在保温隔热、隔水防渗和抗压性能方面表现良好的XPS保温板. 通过建立热弹塑性冻胀计算模型,研究了冻胀力作用下保温板铺设范围、厚度、路基填高和外界温度对新型桩板结构路基受力变形的影响. 结果表明:当保温板铺设范围延伸到线路两端的信号线槽处时,可以更好地阻滞外界负温向下传递(减小冻深),抑制因桩板结构周边土体冻胀对结构物产生的不良影响;随着保温板厚度的增大,冻胀量呈指数形式减小,冻深呈抛物线形减小,保温板上表面处起到抑制外界负温向下传递的作用,下表面处起到控制下部土体温度耗散的作用;增大路基填高,有利于抑制路基冻胀量,减少保温板的使用厚度,当路基填高0.8 m时,保温板垫层厚度需大于0.40 m;当路基填高2.8 m时,保温板垫层厚度需大于0.31 m.

     

  • 图 1  铺设保温板垫层的桩板结构路基横断面及纵断面(单位:m)

    Figure 1.  Cross-section and longitudinal profiles of pile-plank structure with insulation boards (unit:m)

    图 2  保温板铺设范围示意(单位:m)

    Figure 2.  Laying range of insulation boards (unit:m)

    图 3  M1、M2负温度场分布云图

    Figure 3.  Nephogram of M1 and M2 negative temperature field

    图 4  M1、M2各埋深处温度分布

    Figure 4.  Temperature distribution curves of M1 and M2 at different buried depths

    图 5  M1、M2各位置不同埋深处温度分布

    Figure 5.  Temperature distribution curves of M1 and M2 along buried depth at different sites

    图 6  M1、M2竖向位移分布

    Figure 6.  Vertical displacement distribution curves of M1 and M2

    图 7  保温板位移云图及上、下表面温度分布云图

    Figure 7.  Nephogram of insulation board displacement and temperature distribution of its upper and lower surface

    图 8  冻胀量与冻深随保温板厚度变化

    Figure 8.  Variations of frost heaving amount and frozen depth with insulation board thickness

    图 9  保温板上下表面温度时程曲线

    Figure 9.  Temperature time-history curves of upper and lower surface of insulation boards

    图 10  两种路基填高下冻胀量随保温板厚度变化

    Figure 10.  Variations of frost heaving amount with insulation board thickness at roadbed filling heights

    表  1  保温板物性参数

    Table  1.   Physical parameters of insulation boards

    材料类型表观密度/(kg•m−3导热系数/(W•m−1•K−1体积吸水率/%抗压强度/kPa
    EPS30~400.030 0~0.044 03.60~6.00300~345
    PU590.019 71.40322
    XPS40~450.011 0~0.012 00.96~0.97500~650
    下载: 导出CSV

    表  2  冻融条件下3种保温板稳定性对比

    Table  2.   Stability comparison of three kinds of insulation boards under freeze-thaw conditions

    材料
    类型
    冻融循
    环/次
    导热系数/
    (W•m−1•K−1
    体积吸
    水率/%
    抗压强
    度/kPa
    EPS 5 0.025 3 2.60 347
    10 0.024 9 2.50 335
    20 0.025 3 2.80 352
    30 0.024 2 2.50 326
    PU 5 0.019 3 0.50 308
    10 0.018 4 1.10 306
    20 0.018 8 1.00 263
    30 0.018 1 0.90 282
    XPS 5 0.009 8 0.91 646
    10 0.010 2 0.78 637
    20 0.009 3 0.84 628
    30 0.008 6 0.82 663
    下载: 导出CSV

    表  3  土层划分及参数

    Table  3.   Physical parameters by soil division

    土层高度/m密度/(kg•m−3弹性模量/MPa泊松比黏聚力/kPa内摩擦/(°)
    路堤2 00050.000.2575.434
    微湿润粉砂2.51 72025.000.251.031
    饱水细砂9.01 94046.450.252.034
    饱水粉砂6.01 98026.800.253.028
    饱水细砂7.01 94046.450.252.034
    湿润及饱水细砂25.52 04069.650.254.034
    下载: 导出CSV

    表  4  桩板结构参数选取

    Table  4.   Parameter selection of pile-plank structure

    构件
    类型
    尺寸/m密度/(kg•m−3弹性模量/MPa泊松比导热系数/(W•m−1•K−1
    承载板长 22.48,宽 4.99 × 2(双线),高 0.802 50032 5000.181.58
    托梁长10.40,宽 1.30,高 0.852 50032 5000.181.58
    桩基长 30.00,直径 1.25,纵向桩间距 7.50,横向桩间距 5.002 50030 0000.201.58
    下载: 导出CSV
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出版历程
  • 收稿日期:  2019-07-29
  • 修回日期:  2019-11-10
  • 网络出版日期:  2019-11-20
  • 刊出日期:  2021-06-15

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