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封顶块位置对高水压通缝拼装管片结构的影响

梁坤 封坤 肖树 何川 张晓阳 陈松涛 苏昂

梁坤, 封坤, 肖树, 何川, 张晓阳, 陈松涛, 苏昂. 封顶块位置对高水压通缝拼装管片结构的影响[J]. 西南交通大学学报, 2020, 55(6): 1231-1239. doi: 10.3969/j.issn.0258-2724.20190569
引用本文: 梁坤, 封坤, 肖树, 何川, 张晓阳, 陈松涛, 苏昂. 封顶块位置对高水压通缝拼装管片结构的影响[J]. 西南交通大学学报, 2020, 55(6): 1231-1239. doi: 10.3969/j.issn.0258-2724.20190569
LIANG Kun, FENG Kun, XIAO Shu, HE Chuan, ZHANG Xiaoyang, CHEN Songtao, SU Ang. Effect of Key Block Position on Straight Assembling Segmental Lining Structure under High Water Pressure[J]. Journal of Southwest Jiaotong University, 2020, 55(6): 1231-1239. doi: 10.3969/j.issn.0258-2724.20190569
Citation: LIANG Kun, FENG Kun, XIAO Shu, HE Chuan, ZHANG Xiaoyang, CHEN Songtao, SU Ang. Effect of Key Block Position on Straight Assembling Segmental Lining Structure under High Water Pressure[J]. Journal of Southwest Jiaotong University, 2020, 55(6): 1231-1239. doi: 10.3969/j.issn.0258-2724.20190569

封顶块位置对高水压通缝拼装管片结构的影响

doi: 10.3969/j.issn.0258-2724.20190569
基金项目: 国家电网重点研究项目(SHJJGC1700023)
详细信息
    作者简介:

    梁坤(1993—),男,博士研究生,研究方向为隧道与地下工程,E-mail:kunliang556324@outlook.com

    通讯作者:

    封坤(1983—),男,副教授,研究方向为隧道与地下工程,E-mail:windfeng813@163.com

  • 中图分类号: U45

Effect of Key Block Position on Straight Assembling Segmental Lining Structure under High Water Pressure

  • 摘要: 为了探明封顶块位置对盾构隧道管片结构力学行为的影响,基于苏通GIL (gas-insulated transmission)综合管廊隧道工程,选取封顶块在拱顶和拱腰两种代表性工况,开展了高水压条件下的通缝拼装管片结构原型试验,从管片结构的变形、受力、裂纹开展情况和最终破坏状态等方面对两种工况的试验结果进行分析. 研究结果表明:不同封顶块位置对管片结构的影响总体表现为对结构整体刚度的削弱不同,其形成的刚度削弱区域抵抗指向洞外变形的能力要强于指向洞内变形的能力;封顶块位于拱腰时结构整体刚度更大,管片结构椭圆度和单点最大位移均分别减小了39.8%和38.2%;封顶块位于拱顶时结构抗弯刚度削弱明显,易出现较大的纵缝张开,而封顶块位于拱腰时管片最大纵缝张开量明显减小,仅为前者的53.3%,且连接螺栓受力减小了54.4%;封顶块位于拱腰时,管片环拱底内弧面更容易产生裂纹、开裂荷载相对更小,管片内部主筋更早进入受拉状态;封顶块位于拱顶时管片结构由于纵缝张开量较大,在较高水压的情况下破坏始于纵缝处混凝土的压剪破坏进而导致的结构失稳.

     

  • 图 1  苏通GIL综合管廊工程纵断面

    Figure 1.  Schematic diagram of the longitudinal section of the Sutong GIL integrated pipe gallery project

    图 2  苏通GIL综合管廊工程管片布置

    Figure 2.  Schematic diagram of the Sutong GIL integrated pipe gallery project

    图 3  试验加载实况

    Figure 3.  Sketch of assembling segmental lining structure test

    图 4  试验管片布置

    Figure 4.  Layout of group of tests segmental structure

    图 5  80 m水压时的加载图

    Figure 5.  Loading diagram at 80 m water pressure

    图 6  两组试验管片的整体位移

    Figure 6.  Overall displacement of the two sets of test segmental structure

    图 7  两组试验特征位置位移比较

    Figure 7.  Comparison of characteristic position displacement between two groups of tests

    图 8  两组试验整体椭圆度变化

    Figure 8.  Ellipsometry of the two groups

    图 9  两组试验的纵缝张开情况

    Figure 9.  Joint opening of the two set of tests

    图 10  两组试验最大纵缝张开比较

    Figure 10.  Comparison of the maximum longitudinal joint opening of the two groups of tests

    图 11  两组试验最大螺栓应力比较

    Figure 11.  Comparison of maximum bolt stress between two groups of tests

    图 12  两组试验主筋拉应力比较

    Figure 12.  Comparison of tensile stress of main ribs in two groups

    图 13  破坏试验拱顶位移变化

    Figure 13.  Damage displacement diagram of the failure test

    图 14  管片纵缝最终张开图

    Figure 14.  Final opening of the longitudinal joint of the segmental structure

    图 15  管片纵缝最终破坏

    Figure 15.  Final damage diagram of the longitudinal joint of the segmental sturcture

    表  1  试验分组

    Table  1.   Test grouping

    试验编号拼装方式封顶块位置
    GC1通缝拼装拱顶
    GC2通缝拼装左拱腰
    下载: 导出CSV
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出版历程
  • 收稿日期:  2019-06-21
  • 修回日期:  2019-09-12
  • 网络出版日期:  2020-07-07
  • 刊出日期:  2020-12-15

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