Effect of moving train load on ground movement and tunnel deformation due to stacked shield tunnelling

IF 4.2 2区工程技术 Q1 ENGINEERING, GEOLOGICAL Soil Dynamics and Earthquake Engineering Pub Date : 2024-10-04 DOI:10.1016/j.soildyn.2024.108992

Yao Hu , Haoran Tang , Yinggang Xu , Huayang Lei , Junfu Lu , Xuejian Chen , Zilin Gao

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Abstract

Stacked tunnel constructions adjacent to operating metro lines are frequently encountered in dense underground space, leading to undesired settlement and existing tunnel deformation. In this paper, ground movement and tunnel deformation were studied due to stacked shield tunnelling using field monitoring and numerical simulation, particularly the effect of adjacent moving train load on ground and tunnel responses was mainly investigated. Numerical model was implemented based one engineering project of the stacked shield tunnel in Tianjin, China. The results indicate that the ground vertical deformation is influenced by the position of new tunnel and existing tunnel, while the ground horizontal deformation occurs specifically at the top of the new tunnel. The train load contributes to an increase in both vertical and horizontal deformations of the ground and an intensified longitudinal settlement deformation in the existing tunnel. A ground settlement prediction was proposed that considers the stiffness of the existing tunnel and effect of train load. This study provides an in-depth investigation into the deformation of ground and existing tunnel and addressed the non-negligible effect of adjacent train load when evaluating safety of stacked shield tunnelling.

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动车荷载对堆叠式盾构隧道地面移动和隧道变形的影响

在密集的地下空间中，经常会遇到与运营中的地铁线路相邻的堆载隧道施工，从而导致意外沉降和现有隧道变形。本文利用现场监测和数值模拟研究了叠合盾构隧道施工引起的地面运动和隧道变形，尤其是邻近的动车组荷载对地面和隧道响应的影响。数值模型是基于中国天津的一个堆载盾构隧道工程项目实现的。结果表明，地面垂直变形受新建隧道和既有隧道位置的影响，而地面水平变形主要发生在新建隧道顶部。列车荷载导致地面垂直和水平变形增加，并加剧了既有隧道的纵向沉降变形。考虑到既有隧道的刚度和列车荷载的影响，提出了地面沉降预测方法。这项研究对地面和现有隧道的变形进行了深入调查，并解决了在评估堆叠式盾构隧道安全时邻近列车荷载不可忽略的影响问题。

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来源期刊

Soil Dynamics and Earthquake Engineering 工程技术-地球科学综合

CiteScore

7.50

自引率

15.00%

发文量

446

审稿时长

8 months

期刊介绍： The journal aims to encourage and enhance the role of mechanics and other disciplines as they relate to earthquake engineering by providing opportunities for the publication of the work of applied mathematicians, engineers and other applied scientists involved in solving problems closely related to the field of earthquake engineering and geotechnical earthquake engineering. Emphasis is placed on new concepts and techniques, but case histories will also be published if they enhance the presentation and understanding of new technical concepts.