流固耦合作用下,不同洞桩间隙的平行双隧道对群桩响应的影响

IF 6.2 2区 工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY
Tianhua Wu , Yongtao Gao , Changfu Huang , Yu Zhou , Jianwang Li , Wenrui Qi
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引用次数: 0

摘要

在城市地铁施工中,盾构隧道在群桩附近施工较为常见,其附加荷载可能对既有结构构成威胁。本研究建立了流固耦合的多个三维非线性FDM模型,研究复合地层中隧道-桩间隙(Hc)对低承台桩群(2 ×2)的力学响应影响。采用先进的CYSoil模型,结合非线性、应变路径依赖和小应变行为来模拟土壤响应。结果表明,隧道开挖导致孔隙水压力降低~ 66.7 %,形成漏斗状渗流模式。当Hc从0.8D增加到2.6D时,低压区由侧壁向拱顶和仰拱转移,最大位移分别减少14.04 mm(侧向)、5.28 mm(横向)和19.68 mm(竖向)。桩内轴力演化呈快速、缓慢、中等三个阶段下降,轴阻力峰值集中在隧道轴线附近。这些发现有助于优化隧道桩配置和降低岩土工程风险。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Impact of side-by-side twin tunneling with various tunnel-pile clearances on pile group responses under a fluid-solid coupling effect
In urban subway construction, shield tunneling near pile groups is common, where additional loads may threaten existing structures. This study establishes multiple 3D nonlinear FDM models with fluid-solid coupling to investigate how tunnel–pile clearances (Hc) affect the mechanical response of low-cap pile groups (2 ×2) during side-by-side twin tunneling in composite strata. The advanced CYSoil model, incorporating nonlinearity, strain path dependency, and small strain behavior, is employed to simulate soil response. Results show that tunneling induces up to a ∼66.7 % reduction in pore water pressure, forming a funnel-shaped seepage pattern. As Hc increases from 0.8D to 2.6D, the low-pressure zone shifts from sidewalls to vault and invert, while maximum displacements reduce by up to 14.04 mm (lateral), 5.28 mm (transverse), and 19.68 mm (vertical). Axial force evolution in piles follows a three-stage decline, i.e., rapid, slow, and moderate, with peak shaft resistance concentrated near the tunnel axis. These findings aid in optimizing tunnel-pile configurations and mitigating geotechnical risks.
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来源期刊
alexandria engineering journal
alexandria engineering journal Engineering-General Engineering
CiteScore
11.20
自引率
4.40%
发文量
1015
审稿时长
43 days
期刊介绍: Alexandria Engineering Journal is an international journal devoted to publishing high quality papers in the field of engineering and applied science. Alexandria Engineering Journal is cited in the Engineering Information Services (EIS) and the Chemical Abstracts (CA). The papers published in Alexandria Engineering Journal are grouped into five sections, according to the following classification: • Mechanical, Production, Marine and Textile Engineering • Electrical Engineering, Computer Science and Nuclear Engineering • Civil and Architecture Engineering • Chemical Engineering and Applied Sciences • Environmental Engineering
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