Safety assessment of the construction of double track tunnels underneah exsiting railway tunnels

IF 1.1 Q3 ENGINEERING, CIVIL

Archives of Civil Engineering Pub Date : 2024-03-29 DOI:10.24425/ace.2024.148917

Fengfeng Guo, Yupeng Chen, Yongjie Zhang, Qi Feng, Da Cui

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引用次数: 0

Abstract

The ground disturbance caused by the tunnel construction will inevitably have an impact on the upper part of the constructed tunnel structure, and the railroad tunnel requires a very high level of control over the structural settlement deformation. For the problem of double-hole tunnel under the built tunnel, this paper takes Chongqing Mingyue Mountain Tunnel under the built Shanghai-Rong Railway Paihua Cave tunnel and Zheng-Yu Railway tunnel as the engineering background, and starts from the mechanism of ground loss caused by tunnel excavation, firstly, the settlement at the height of the existing tunnel strata is obtained through theoretical analysis, and the new Mingyue Mountain Tunnel under the Shanghai-Rong Railway tunnel is determined to be a more dangerous section. Further simulate and calculate the dynamic excavation process of the new double-hole tunnel underpass, and study the settlement deformation law of the Mingyue Mountain Tunnel underpassing the Hurong Railway Tunnel. According to the requirements of railroad tunnel for settlement deformation control, the new tunnel is determined to be constructed by step method to ensure the safety of railroad tunnel. The shortcomings of the theoretical calculation are analyzed to illustrate the important role of numerical simulation in the evaluation of tunnel underpass projects.

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在现有铁路隧道下建造双轨隧道的安全评估

隧道施工造成的地层扰动，不可避免地会对已建隧道上部结构产生影响，铁路隧道对结构沉降变形的控制要求非常高。针对已建隧道下穿双洞隧道的问题，本文以重庆明月山隧道下穿已建沪蓉铁路排花洞隧道和郑渝铁路隧道为工程背景，从隧道开挖引起的地表损失机理入手，首先通过理论分析得到既有隧道地层高程处的沉降量，确定新建明月山隧道下穿沪蓉铁路隧道为较危险地段。进一步模拟计算新建双洞下穿隧道的动态开挖过程，研究明月山隧道下穿沪蓉铁路隧道的沉降变形规律。根据铁路隧道对沉降变形控制的要求，确定新建隧道采用台阶法施工，确保铁路隧道安全。分析了理论计算的不足，说明了数值模拟在隧道下穿工程评估中的重要作用。

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

Archives of Civil Engineering ENGINEERING, CIVIL-

CiteScore

1.50

自引率

28.60%

发文量

审稿时长

24 weeks

期刊介绍： ARCHIVES OF CIVIL ENGINEERING publish original papers of the theoretical, experimental, numerical and practical nature in the fields of structural mechanics, soil mechanics and foundations engineering, concrete, metal, timber and composite polymer structures, hydrotechnical structures, roads, railways and bridges, building services, building physics, management in construction, production of construction materials, construction of civil engineering structures, education of civil engineers.