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管棚承载机制的理论分析

张建 严松宏 王文 孙纬宇

张建, 严松宏, 王文, 孙纬宇. 管棚承载机制的理论分析[J]. 西南交通大学学报. doi: 10.3969/j.issn.0258-2724.20230425
引用本文: 张建, 严松宏, 王文, 孙纬宇. 管棚承载机制的理论分析[J]. 西南交通大学学报. doi: 10.3969/j.issn.0258-2724.20230425
ZHANG Jian, YAN Songhong, WANG Wen, SUN Weiyu. Theoretical Analysis of Bearing Mechanism of Pipe Sheds[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20230425
Citation: ZHANG Jian, YAN Songhong, WANG Wen, SUN Weiyu. Theoretical Analysis of Bearing Mechanism of Pipe Sheds[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20230425

管棚承载机制的理论分析

doi: 10.3969/j.issn.0258-2724.20230425
基金项目: 国家自然科学基金(52208392、52068044);甘肃省自然科学基金(21JR7RA309);中国博士后科学基金(2021M693843)
详细信息
    作者简介:

    张建(1987—),男,博士研究生,研究方向为公路隧道设计方法,E-mail:16813698@qq.com

    通讯作者:

    严松宏(1966—),男,教授,研究方向为地下工程设计施工理论及其工程应用,E-mail:yansonghong@163.com

  • 中图分类号: TU43;U451

Theoretical Analysis of Bearing Mechanism of Pipe Sheds

  • 摘要:

    建立合理准确的管棚理论分析模型并对其进行求解,对推动管棚预支护技术的进一步发展具有重要意义. 本文在隧道开挖、支护的施工过程以及未开挖段由于掌子面扰动而导致管棚约束反力有所降低的基础上,建立了基于Euler-Bernoulli梁理论的管棚荷载结构模型,同时引入Pasternak弹性地基模型来确定初期支护及掌子面前方岩体对管棚的约束反力,推导出每一循环隧道开挖支护过程中管棚的受力和变形解析表达式,并通过叠加法求解掌子面掘进至任意位置时管棚的受力和变形分布;通过案例比对,验证了本文建立模型的合理性和有效性. 研究结果表明:管棚钢管环向间距越小、直径越大越有利于提升管棚的预加固能力;管棚合理搭接长度为1.8 m.

     

  • 图 1  管棚在单个开挖循环进尺下的理论分析模型

    Figure 1.  Theoretical analysis model of pipe shed under an excavation cycle footage

    图 2  管棚的受力和变形分布(n=30)

    Figure 2.  Stress and deformation distribution of pipe shed (n=30)

    图 3  管棚的受力和变形的分布变化

    Figure 3.  Distribution variation of stress and deformation of pipe shed

    图 4  管棚变形模型预测值与现场实测数据对比

    Figure 4.  Comparison between predicted values of pipe shed deformation model and on-site measured data

    图 5  环向间距与管棚变形的关系

    Figure 5.  Relationships between circumferential spacing and deformation of pipe shed

    图 6  环向间距与管棚内力的关系

    Figure 6.  Relationships between circumferential spacing and internal force of pipe shed

    图 7  管径与管棚变形的关系

    Figure 7.  Relationships between pipe diameter and deformation of pipe shed

    图 9  搭接长度对管棚受力和变形的影响

    Figure 9.  Influence of lap length on stress and deformation of pipe shed

    图 8  管径与管棚内力的关系

    Figure 8.  Relationship between pipe diameter and internal force of pipe shed

    表  1  Pasternak弹性地基参数

    Table  1.   Pasternak elastic foundation parameters

    项目 基床系数/(kN·m−3 地基剪切模量/(kN·m−1
    初期支护 7.84 × 107 9.51 × 104
    岩体 1.64 × 105 1.63 × 103
    下载: 导出CSV
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出版历程
  • 收稿日期:  2023-08-23
  • 修回日期:  2024-02-17
  • 网络出版日期:  2024-07-25

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