A Case Study of Tunnel Reinforcement Measure during Traffic Upgrading in Chongqing City, China

4区工程技术 Q1 Mathematics Mathematical Problems in Engineering Pub Date : 2024-02-20 DOI:10.1155/2024/5533105

Zhiwei Cai, Tongqing Wu, Hao Zhang, Jie Liu, Zhao Xiang, Ying Tao, Xingfa Feng

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Abstract

Because the urban tunnel is an essential knot of urban traffic and an easy blocking point in busy hours, upgrading the urban tunnel was necessary for the city after the tunnel being in service for a long time. However, to demolish the existing tunnel, some problems may be encountered, and these problems include occurrence of longitudinal cracks at the tunnel vault, increase of load due to infrastructure construction over the tunnel, unloading due to excavation of the rock over the tunnel, and uneven load due to asymmetric excavation or construction. To reinforce a cracked tunnel in Chongqing City, China, steel arches were installed to improve its bearing capacity, but some steel arches failed during the excavation of ground over the tunnel. Therefore, the scheme of “steel arch + shotcrete + tube column + transversal horizontal bracing” (hereinafter referred to as SASTCT) was proposed to ensure tunnel safety due to unloading and uneven load during the subsequent construction procedures. Numerical analysis indicated that the SASTCT measure can ensure the safety of the traffic and subsequent construction, which can provide some suggestions for similar tunnel upgrades in the future.

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中国重庆市交通升级期间隧道加固措施案例研究

由于城市隧道是城市交通的咽喉要道，也是繁忙时段的易堵点，在隧道长期使用后，对城市隧道进行改造是必要的。然而，在拆除现有隧道时，可能会遇到一些问题，包括隧道拱顶出现纵向裂缝、隧道上部基建施工导致荷载增加、隧道上部岩石开挖导致卸载、开挖或施工不对称导致荷载不均匀等。为加固中国重庆市一条开裂的隧道，安装了钢拱架以提高其承载能力，但在隧道上方的地面开挖过程中，部分钢拱架失效。因此，提出了 "钢拱架+喷射混凝土+管柱+横向水平支撑"（以下简称 SASTCT）方案，以确保隧道在后续施工过程中因卸载和不均匀荷载而产生的安全。数值分析表明，SASTCT 措施能够确保行车和后续施工的安全，可为今后类似的隧道升级改造提供一些建议。

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

Mathematical Problems in Engineering 工程技术-工程：综合

CiteScore

4.00

自引率

0.00%

发文量

2853

审稿时长

4.2 months

期刊介绍： Mathematical Problems in Engineering is a broad-based journal which publishes articles of interest in all engineering disciplines. Mathematical Problems in Engineering publishes results of rigorous engineering research carried out using mathematical tools. Contributions containing formulations or results related to applications are also encouraged. The primary aim of Mathematical Problems in Engineering is rapid publication and dissemination of important mathematical work which has relevance to engineering. All areas of engineering are within the scope of the journal. In particular, aerospace engineering, bioengineering, chemical engineering, computer engineering, electrical engineering, industrial engineering and manufacturing systems, and mechanical engineering are of interest. Mathematical work of interest includes, but is not limited to, ordinary and partial differential equations, stochastic processes, calculus of variations, and nonlinear analysis.