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基于双层梁理论的隧道下穿诱发无砟铁路变形计算方法

雷鸣 张丙强 刘海 黄志斌

雷鸣, 张丙强, 刘海, 黄志斌. 基于双层梁理论的隧道下穿诱发无砟铁路变形计算方法[J]. 西南交通大学学报, 2024, 59(3): 646-652, 669. doi: 10.3969/j.issn.0258-2724.20230033
引用本文: 雷鸣, 张丙强, 刘海, 黄志斌. 基于双层梁理论的隧道下穿诱发无砟铁路变形计算方法[J]. 西南交通大学学报, 2024, 59(3): 646-652, 669. doi: 10.3969/j.issn.0258-2724.20230033
LEI Ming, ZHANG Bingqiang, LIU Hai, HUANG Zhibin. Theoretical Method for Calculating Rail Deformation of Ballastless Railway Caused by Tunnel Undercrossing Based on Dual Beam Model[J]. Journal of Southwest Jiaotong University, 2024, 59(3): 646-652, 669. doi: 10.3969/j.issn.0258-2724.20230033
Citation: LEI Ming, ZHANG Bingqiang, LIU Hai, HUANG Zhibin. Theoretical Method for Calculating Rail Deformation of Ballastless Railway Caused by Tunnel Undercrossing Based on Dual Beam Model[J]. Journal of Southwest Jiaotong University, 2024, 59(3): 646-652, 669. doi: 10.3969/j.issn.0258-2724.20230033

基于双层梁理论的隧道下穿诱发无砟铁路变形计算方法

doi: 10.3969/j.issn.0258-2724.20230033
基金项目: 福建省自然科学基金(2020J01882,2023J01344);湖南省教育厅重点项目(19A044)
详细信息
    作者简介:

    雷鸣(1977—),男,副教授,博士,研究方向为岩土工程,E-mail:540584998@qq.com

    通讯作者:

    张丙强(1979—),男,教授,博士,研究方向为地下工程,E−mail:zbq@fjut.edu.cn

  • 中图分类号: U211.1

Theoretical Method for Calculating Rail Deformation of Ballastless Railway Caused by Tunnel Undercrossing Based on Dual Beam Model

  • 摘要:

    为研究隧道下穿无砟铁路轨道时板底部脱空对轨道变形的影响,提出一种改进的隧道下穿引起无砟铁路变形的计算方法. 首先,将无砟铁路轨道结构简化为双层地基梁模型,建立隧道下穿施工引起无砟铁路变形的控制方程;然后,将无砟铁路分为中间脱空段和两端接地段共三部分,推导隧道下穿施工诱发无砟铁路变形的计算式,对比路基不均匀沉降引起无砟轨道变形的理论计算值与数值模拟结果,验证了理论计算方法的正确性;最后,探讨了新建隧道埋深、隧道下穿施工引起周围地层的损失率,以及既有铁路与隧道间的水平夹角对无砟铁路轨道变形的影响. 研究结果表明:当隧道从铁路下方6 m处垂直穿越既有铁路时,轨道中点变形将达到最大值;隧道施工引起周围地层损失率从0.25%增大到2.50%时,轨道中点变形和轨道板底部脱空区宽度将分别增大4.0倍和2.2倍.

     

  • 图 1  隧道下穿既有铁路力学分析示意

    Figure 1.  Mechanical analysis of existing railway caused by tunnel undercrossing

    图 2  本文结果与文献[23]数据的对比

    Figure 2.  Comparisons between results of this study and data from literature [23]

    图 3  隧道埋深的影响

    Figure 3.  Influence of buried depth of new tunnel

    图 4  隧道施工引起地层损失率的影响

    Figure 4.  Influence of ground loss rate caused by tunnel undercrossing construction

    图 5  地铁线路与隧道水平夹角的影响

    Figure 5.  Influence of intersection angle between between railway and tunnel

    表  1  无砟轨道材料参数

    Table  1.   Parameters of ballastless rail material

    结构弹性模量/Pa泊松比说明
    钢轨2.10 × 10110.30T60 轨
    道床板3.25 × 10100.17C40 混凝土
    支承层2.55 × 10100.17C20 混凝土
    路基1800.25密度 300 kg/m3
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出版历程
  • 收稿日期:  2023-02-07
  • 修回日期:  2023-10-01
  • 网络出版日期:  2024-01-19
  • 刊出日期:  2023-10-31

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