盾构下穿引起围压改变对既有盾构隧道的影响研究

doi:10.3973/j.issn.2096-4498.2025.04.005

隧道建设（中英文） ›› 2025, Vol. 45 ›› Issue (4): 708-718.DOI: 10.3973/j.issn.2096-4498.2025.04.005

盾构下穿引起围压改变对既有盾构隧道的影响研究

魏纲^{1, 2}，蔡浩然¹，齐永洁¹，冯国辉²，徐天宝³

(1. 浙江大学建筑工程学院，浙江杭州 310058； 2. 浙大城市学院土木工程系，浙江杭州 310015；3. 中铁十五局集团第五工程有限公司，天津 300131)

出版日期:2025-04-20 发布日期:2025-04-20
作者简介:魏纲(1977—)，男，浙江杭州人，2006年毕业于浙江大学，岩土工程专业，博士，教授，主要从事地下隧道和岩土工程等方面的研究工作。E-mail: weig@hzcu.edu.cn。

Influence of Confining Pressure Change Caused by Shield Undercrossing on Existing Shield Tunnels

WEI Gang^{1, 2}, CAI Haoran¹, QI Yongjie¹, FENG Guohui², XU Tianbao³

(1. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, Zhejiang, China; 2. Department of Civil Engineering, Hangzhou City University, Hangzhou 310015, Zhejiang, China; 3. China Railway 15th Bureau Group 5th Engineering Co., Ltd., Tianjin 300131, China)

Online:2025-04-20 Published:2025-04-20

摘要/Abstract

摘要： 为研究盾构下穿对既有隧道环向受力变形的影响，在考虑隧道开挖应力释放效应、环间剪切力和环间拉力的情况下，改进既有隧道的围压重分布模型，求出既有隧道环向荷载。结合工程案例，利用Midas GTS NX有限元软件建立精细化三环管片模型，模拟围压重分布后既有隧道的变化。研究结果表明： 1）盾构近距离下穿会引起既有隧道环向围压减小，在考虑环间剪切力和环间拉力条件下，既有隧道环向附加围压分布不对称，呈偏向穿越侧上小下大的歪“8”字形。2）沿既有隧道前进方向，距离穿越中心越远，附加围压绝对值越小，既有隧道附加收敛值越小；在距离穿越中心约Z₀处趋于0（Z₀为既有隧道埋深），既有隧道在210°和330°位置处变化最大，附加围压减小值分别为28.11 kPa和25.54 kPa，变化率分别为10.96%和11.84%。3）随着土体损失率增大，附加围压绝对值越大，既有隧道附加收敛值越大；在土体损失率达到1.5%时，附加收敛值为13.7 mm，变化率为48.9%。4）随着隧道间距增大，附加围压绝对值越小，既有隧道附加收敛值越小；在隧道间距为7.6 m时，附加收敛值为13.3 mm，变化率为47.5%。

关键词: 盾构下穿, 附加围压, 数值模拟, 附加收敛值, 既有盾构隧道

Abstract: To examine the influence of shield undercrossing on the circumferential deformation of an existing shield tunnel, the confining pressure redistribution model of the existing tunnel is improved. The improved model considers the stress relief, inter-ring shear force, and inter-ring tensile force of tunnel excavation to determine the circumferential load on the existing structure. Based on an engineering case, a refined three-ring segment model is established using Midas GTS NX finite element software to simulate the changes in the existing tunnel after confining pressure redistribution. The simulation results demonstrate the following: (1) The circumferential confining pressure of the existing tunnel decreases because of the proximity of the shield undercrossing. When the inter-ring shear and inter-ring tensile forces are considered, the additional circumferential confining pressure of the existing tunnel exhibits an asymmetrical distribution, forming an oblique figure-eight shape toward the crossing side. (2) Along the direction of the existing tunnel, the farther the distance from the crossing center, the smaller the absolute value of the additional confining pressure and the smaller the additional convergence value of the existing tunnel, which tends to zero at approximately Z₀ from the crossing center (where Z₀ is the buried depth of the existing tunnel). The existing tunnel changes the most at 210° and 330°, where the additional confining pressure decreases by 28.11 and 25.54 kPa, corresponding to change rates of 10.96% and 11.84%, respectively. (3) An increase in the soil loss rate correlates with a greater absolute value of the additional confining pressure and a larger additional convergence value of the existing tunnel. When the soil loss rate reaches 1.5%, the additional convergence value is 13.7 mm, and the change rate reaches 48.9%. (4) With increasing tunnel spacing, the absolute value of the additional confining pressure is smaller, and the additional convergence value of the existing tunnel is smaller. When the tunnel spacing is 7.6 m, the additional convergence value is 13.3 mm, and the change rate reaches 47.5%.

Key words: shield undercrossing, additional confining pressure, numerical simulation, additional convergence values, existing shield tunnel

魏纲, 蔡浩然, 齐永洁, 冯国辉, 徐天宝. 盾构下穿引起围压改变对既有盾构隧道的影响研究[J]. 隧道建设, 2025, 45(4): 708-718.

WEI Gang, CAI Haoran, QI Yongjie, FENG Guohui, XU Tianbao. Influence of Confining Pressure Change Caused by Shield Undercrossing on Existing Shield Tunnels[J]. Tunnel Construction, 2025, 45(4): 708-718.

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盾构下穿引起围压改变对既有盾构隧道的影响研究

Influence of Confining Pressure Change Caused by Shield Undercrossing on Existing Shield Tunnels

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