Deformation analysis of high-speed railway CFG pile composite subgrade during shield tunnel underpassing

IF 3.9 2区工程技术 Q1 ENGINEERING, CIVIL

Structures Pub Date : 2025-05-21 DOI:10.1016/j.istruc.2025.109193

Erdong Guo , Haoran Hu , Jinxing Lai , Wenhao Zhang , Siyue He , Guanhua Cui , Ke Wang , Lixin Wang

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Abstract

With the rapid development of China's high-speed railway and subway systems, numerous interconnected projects have emerged. Engineers have widely adopted CFG pile composite foundations to reinforce weak high-speed railway subgrades, yet theoretical research on their behavior during tunnel underpassing remains limited. Focusing on a shield tunnel project underpass high-speed railway (Xulan High-Speed Rail in Xi'an Metro), this study investigated the subgrade deformation failure mechanism during tunneling through multi-scale methods such as theoretical analysis, model tests, and numerical simulations. Results indicate that ground loss rate and the distance between pile bases and the tunnel most significantly affect subgrade deformation. At ground loss rates of 0.5 %, 1.0 %, and 1.5 %, the maximum subgrade settlements were 3.2 mm, 6.4 mm, and 9.6 mm, respectively. Finally, control criteria for subgrade deformation zoning based on settlement U were established: strong influence zone (U ≥ 8 mm), weak influence zone (4 ≤ U < 8 mm), and non-affected zone (U < 4 mm).

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高速铁路CFG桩复合路基盾构隧道下穿变形分析

随着中国高速铁路和地铁系统的快速发展，出现了许多相互关联的项目。CFG桩复合地基在高速铁路软弱路基加固中得到了广泛的应用，但对其在隧道下穿过程中的性能理论研究较少。以某盾构隧道工程下穿高速铁路（西安地铁许兰高铁）为研究对象，通过理论分析、模型试验和数值模拟等多尺度方法，对隧道开挖过程中路基变形破坏机理进行了研究。结果表明，地基损失率和桩基与隧道的距离对路基变形的影响最为显著。在地面损失率为0.5 %、1.0 %和1.5 %时，路基最大沉降分别为3.2 mm、6.4 mm和9.6 mm。最后，建立了基于沉降U的路基变形分区控制准则：强影响区（U≥8 mm）、弱影响区(4 ≤U <；8 mm)，非影响区(U <； 4毫米)。

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来源期刊

Structures Engineering-Architecture

CiteScore

5.70

自引率

17.10%

发文量

1187

期刊介绍： Structures aims to publish internationally-leading research across the full breadth of structural engineering. Papers for Structures are particularly welcome in which high-quality research will benefit from wide readership of academics and practitioners such that not only high citation rates but also tangible industrial-related pathways to impact are achieved.