管棚承载机制的理论分析

张建; 严松宏; 王文; 孙纬宇

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

张建^{1, 2,},
严松宏^{1, 3, ,},
王文²,
孙纬宇^{1, 3}

1.
兰州交通大学土木工程学院，甘肃兰州 730070
2.
甘肃省交通规划勘察设计院股份有限公司，甘肃兰州 730030
3.
甘肃省道路桥梁与地下工程重点实验室，甘肃兰州 730070

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
计量
- 文章访问数: 30
- HTML全文浏览量: 30
- PDF下载量: 10
- 被引次数: 0
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

Theoretical Analysis of Bearing Mechanism of Pipe Sheds

ZHANG Jian^{1, 2
,},
YAN Songhong^{1, 3
, ,},
WANG Wen²,
SUN Weiyu^{1, 3}

1.
School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
2.
Gansu Provincial Transportation Planning Survey and Design Institute Co., Ltd., Lanzhou 730030, China
3.
Key Laboratory of Road & Bridge and Underground Engineering of Gansu Province, Lanzhou 730070, China

摘要

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.
- 隧道工程 /
- 管棚 /
- 设计参数 /
- 解析解
Abstract:
Establishing a reasonable and accurate theoretical analysis model for pipe sheds and solving it are of great significance to promoting the development of pipe shed pre-support technology. By analyzing the construction process of tunnel excavation and support and the reduction of the restraining reaction force of the pipe shed due to the disturbance of the tunnel face in the unexcavated section, a load structure model of the pipe shed based on the Euler-Bernoulli beam theory was established. The Pasternak elastic foundation model was introduced to determine the initial support and the restraining reaction force of the rock mass in front of the tunnel face on the pipe shed, and the analytical expressions of the stress and deformation of the pipe shed during each cycle of tunnel excavation and support were derived. In addition, the superposition method was used to solve the stress and deformation distribution of the pipe shed when the tunnel face was tunneled to any position. Through case comparison, the rationality and effectiveness of the model were verified. The research results show that smaller circumferential spacing and larger diameter of the pipe shed steel pipes are helpful in improving the pre-reinforcement capacity of the pipe shed, and the reasonable lap length of the pipe shed is 1.8 m.
- tunnel engineering /
- pipe shed /
- design parameter /
- analytical solution

HTML全文

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

下载: 全尺寸图片幻灯片

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）

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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

下载: 全尺寸图片幻灯片

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

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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

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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

下载: 全尺寸图片幻灯片

图 7 管径与管棚变形的关系

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

下载: 全尺寸图片幻灯片

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

下载: 全尺寸图片幻灯片

图 8 管径与管棚内力的关系

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

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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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