Effect of shield tunneling on adjacent pile foundations in water-rich strata

IF 4.9 2区工程技术 Q1 ENGINEERING, CIVIL

Transportation Geotechnics Pub Date : 2025-04-01 DOI:10.1016/j.trgeo.2025.101557

Jie Su , Yuqiang Pan , Xiaokai Niu , Chengping Zhang

引用次数: 0

Abstract

Shield tunneling in urban environments inevitably intersects with adjacent pile foundations, adversely affecting their internal forces and deformations. In this study, a series of model tests and numerical simulations were conducted to examine shield tunneling across pile foundations. The disturbance caused by shield tunnel excavation on the ground surface and pile foundations under different groundwater conditions was analyzed in detail. The results indicate that, compared to dry strata, shield tunneling in water-rich strata increases the maximum surface settlement by approximately 22 %, while also raising the axial force of pile foundations by 16 %–23 % and the lateral displacement of pile bodies at various depths by 15 %–28 %. Furthermore, as the pile foundation diameter increases, the absolute bending moment rises significantly. It is suggested that the pile-tunnel distance should be greater than 2 D_t in engineering design to greatly reduce the response of pile foundation.

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富水地层盾构隧道开挖对邻近桩基的影响

盾构隧道在城市环境中不可避免地与邻近的桩基发生交叉，对桩基的内力和变形产生不利影响。本文对盾构隧道跨桩施工进行了一系列的模型试验和数值模拟。详细分析了不同地下水条件下盾构隧道开挖对地表和桩基的扰动。结果表明，与干地层相比，富水地层中盾构隧道的最大地表沉降增加了约22%，同时桩基轴向力增加了16% ~ 23%，各深度桩体的侧向位移增加了15% ~ 28%。随着桩基直径的增大，绝对弯矩显著增大。建议在工程设计中，桩隧距离应大于2 Dt，以大大减小桩基础的响应。

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

Transportation Geotechnics Social Sciences-Transportation

CiteScore

8.10

自引率

11.30%

发文量

194

审稿时长

51 days

期刊介绍： Transportation Geotechnics is a journal dedicated to publishing high-quality, theoretical, and applied papers that cover all facets of geotechnics for transportation infrastructure such as roads, highways, railways, underground railways, airfields, and waterways. The journal places a special emphasis on case studies that present original work relevant to the sustainable construction of transportation infrastructure. The scope of topics it addresses includes the geotechnical properties of geomaterials for sustainable and rational design and construction, the behavior of compacted and stabilized geomaterials, the use of geosynthetics and reinforcement in constructed layers and interlayers, ground improvement and slope stability for transportation infrastructures, compaction technology and management, maintenance technology, the impact of climate, embankments for highways and high-speed trains, transition zones, dredging, underwater geotechnics for infrastructure purposes, and the modeling of multi-layered structures and supporting ground under dynamic and repeated loads.