Analysis of longitudinal deformation of existing rectangular pipe jacking tunnel caused by shield tunnel undercrossing

IF 6.7 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Tunnelling and Underground Space Technology Pub Date : 2025-03-17 DOI:10.1016/j.tust.2025.106532

Youjun Xu , Zhengxi Zhang , Chao Zhang , Xin Han , Tianyu Liu , Xu Zhang

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引用次数: 0

Abstract

The existing rectangular pipe jacking tunnel is prone to deform after the construction of the new nearby shield tunnel, resulting in longitudinal uneven settlement, water leakage, and other ailments that could jeopardize the structure’s safety. The safety of the existing rectangular pipe jacking tunnel is in jeopardy in order to prevent the excessive deformation of the tunnel following the construction of the new shield tunnel. This paper proposes the foundation stiffness function model and SP-T model to describe the settlement curve of the new shield tunnel to the existing rectangular pipe jacking tunnel using the first phase project of Hohhot Rail Transit Line 2 in Inner Mongolia as an example. The model is more coincidental than the original Pasternak-Timoshenko model considering the distribution in soil caused by the excavation of a new tunnel because it takes into account the change in foundation stiffness based on the Pasternak foundation. The findings demonstrate the consistency between the field data results and the prediction results derived from the analysis method presented in this paper. The further parametric study examined some influences on the construction of a new shield tunnel that affects already-existing pipe jacking tunnels. These studies include equivalent longitudinal bending and shear stiffness, as well as the location and angle of the new tunnel in relation to the existing rectangular pipe jacking tunnel. In addition to highlighting the impact of equivalent shear stiffness on the existing rectangular pipe jacking tunnel, the impact of equivalent longitudinal bending stiffness and equivalent longitudinal shear stiffness on settlement is discussed in the article. This paper’s research methodology can not only forecast the new shield tunnel’s longitudinal settlement deformation beneath the existing rectangular pipe jacking tunnel, but it can also generate fresh concepts for investigating related issues.

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既有矩形顶管隧道盾构下穿引起的纵向变形分析

临近盾构隧道新建后，原有矩形顶管隧道易发生变形，造成纵向沉降不均匀、漏水等危害结构安全的问题。为了防止新盾构隧道施工后隧道过度变形，危及既有矩形顶管隧道的安全。本文以内蒙古呼和浩特轨道交通二号线一期工程为例，提出了基础刚度函数模型和SP-T模型来描述新建盾构隧道对既有矩形顶管隧道的沉降曲线。由于考虑了基于帕斯捷尔纳克地基的基础刚度变化，该模型比考虑新隧道开挖引起的土体分布的原Pasternak- timoshenko模型更具一致性。结果表明，现场实测数据与本文分析方法预测结果吻合较好。进一步的参数化研究考察了新建盾构隧道施工对已有顶管隧道的影响。这些研究包括等效纵向弯曲和剪切刚度，以及新隧道相对于现有矩形顶管隧道的位置和角度。文中除了突出等效剪切刚度对既有矩形顶管隧道的影响外，还讨论了等效纵向弯曲刚度和等效纵向剪切刚度对沉降的影响。本文的研究方法不仅可以预测新盾构隧道在既有矩形顶管隧道下的纵向沉降变形，而且可以为相关问题的研究提供新的概念。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Tunnelling and Underground Space Technology 工程技术-工程：土木

CiteScore

11.90

自引率

18.80%

发文量

454

审稿时长

10.8 months

期刊介绍： Tunnelling and Underground Space Technology is an international journal which publishes authoritative articles encompassing the development of innovative uses of underground space and the results of high quality research into improved, more cost-effective techniques for the planning, geo-investigation, design, construction, operation and maintenance of underground and earth-sheltered structures. The journal provides an effective vehicle for the improved worldwide exchange of information on developments in underground technology - and the experience gained from its use - and is strongly committed to publishing papers on the interdisciplinary aspects of creating, planning, and regulating underground space.