盾构下穿高速公路对既有平行通道桥的影响规律

Influence of shield underpass expressway on existing parallel channel bridges

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摘要为探讨盾构下穿高速公路对既有平行通道桥的影响规律,以韩江榕江练江水系连通后续优化工程盾构隧道穿越G78汕昆高速公路路堤为背景,建立三维有限元模型,分析盾构施工对地表沉降、高速公路路基、既有平行通道桥桩基的影响规律。结果表明:1)盾构隧道开挖对地层的影响范围大致为隧道直径的4倍;2)隧道轴线正上方地表沉降值最大,达到5.6 mm,路基最大沉降值发生在隧道轴线正上方,约为5 mm;3)通道桥桩基竖向位移均表现为沉降,靠近盾构侧桩基沉降大于远侧,其中桩基Z1沉降值最大,达到2.4 mm;4)隧道埋深顶面处对应的桩基水平位移较大,受盾构掘进叠加影响,桩基Z1水平位移最大,约为0.37 mm;5)弯矩的最大值出现在隧道埋深位置附近,轴力的最大值出现在桩身中点位置,桩基Z1弯矩和轴力最大。 In order to explore the influence of shield underpass expressway on the existing parallel channel bridges,a three⁃dimensional finite element model is established to analyze the influence law of shield construction on the surface settlement,highway subgrade and existing parallel channel bridge pile foundation under the background of the shield tunnel crossing the embankment of the G78 Shankun expressway in the follow⁃up optimization project of the Hanjiang⁃Rongjiang⁃Lianjiang river system.The results show that:1)The influence range of shield tunnel excavation on the stratum is roughly 4 times of the tunnel diameter;2)The maximum surface settlement value directly above the tunnel axis reaches 5.6 mm,and the maximum settlement value of the roadbed occurs directly above the tunnel axis,which is about 5 mm;3)The vertical displacement of the pile foundation of the channel bridge is all subsided,and the settlement of the pile foundation near the shield side is greater than that of the far side,and the settlement value of the pile foundation Z1 is the largest,reaching 2.4 mm;4)The horizontal displacement of the pile foundation corresponding to the top surface of the tunnel buried depth is large,and the horizontal displacement of the pile foundation Z1 is the largest,about 0.37 mm,which is affected by the superposition of shield;5)The maximum value of bending moment appears near the buried depth position of the tunnel,the maximum value of axial force appears at the midpoint position of the pile body,and the bending moment and axial force of the pile foundation Z1 are the largest.

作者邓方园王山平马迪卢春雨陈保国 DENG Fangyuan;WANG Shanping;MA Di;LU Chunyu;CHEN Baoguo(Sinohydro Bureau 7 Co.,Ltd.,Chengdu 610081,Sichuan,China;Engineering Faculty,China University of Geosciences,Wuhan 430074,Hubei,China)

机构地区中国水利水电第七工程局有限公司中国地质大学(武汉)工程学院

出处《工程建设》 2025年第1期67-72,共6页 Engineering Construction

基金中国水利水电第七工程局有限公司科技攻关项目(GSSC-科研-2023-001)。

关键词盾构隧道下穿公路桩基有限元模型地表沉降路基沉降桩基位移 shield tunnel underpass highway pile foundation finite element model surface settlement roadbed settlement pile foundation displacement

分类号 U455.43 [建筑科学—桥梁与隧道工程]

作者简介邓方园(1981—),男,高级工程师,从事盾构隧道科研与工程技术管理工作。;通信作者:马迪(1999—),男,硕士研究生,从事岩土工程领域相关研究。