盾构隧道全过程穿越对下方既有隧道的影响研究

魏纲; 冯非凡; 齐永洁; 华鑫欣

doi:10.3973/j.issn.2096-4498.2022.S2.010

隧道建设 >

2022 , Vol. 42 >Issue S2: 69 - 79

DOI: https://doi.org/10.3973/j.issn.2096-4498.2022.S2.010

研究与探索

盾构隧道全过程穿越对下方既有隧道的影响研究

魏纲 ,
冯非凡 ,
齐永洁 ,
华鑫欣

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（1. 浙大城市学院土木工程系，浙江杭州 310015； 2. 浙江省城市盾构隧道安全建造与智能养护重点实验室，浙江杭州 310015； 3. 城市基础设施智能化浙江省工程研究中心，浙江杭州 310015； 4. 浙江大学建筑工程学院，浙江杭州 310058； 5. 中铁二院华东勘察设计有限责任公司，浙江杭州 310004）

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，主要从事城市地下隧道工程的防灾减灾研究。 Email: weig@zucc.edu.cn。

网络出版日期: 2023-03-24

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Influence of Shield Tunneling on Existing Shield Tunnel Below

WEI Gang ,
FENG Feifan ,
QI Yongjie ,
HUA Xinxin

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(1.Department of Civil Engineering,Hangzhou City University,Hangzhou 310015,Zhejiang,China;2.Key Laboratory of Safe Construction and Intelligent Maintenance for Urban Shield Tunnels of Zhejiang Province,Hangzhou 310015,Zhejiang,China;3.Zhejiang Engineering Research Center of Intelligent Urban Infrastructure,Hangzhou 310015, Zhejiang,China;4.College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,Zhejiang,China;5.CREEC East China Survey and Design Co.,Ltd.,Hangzhou 310004,Zhejiang,China)

Online published: 2023-03-24

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摘要

为探究盾构掘进过程中下方既有隧道的受力变化规律，建立盾构上穿计算模型，考虑盾构刀盘附加推力、盾壳侧摩阻力、附加注浆压力和开挖引起的土体损失4个因素产生的附加应力，根据隧道围压重分布三阶段理论计算出既有隧道的实时围压，并采用修正惯用法计算内力。以实际上穿工程案例为基础，分析其在穿越过程中下方隧道的弯矩、轴力以及剪力的变化，并研究不同隧道埋深的影响规律。结果表明： 1）隧道周围的水平附加应力主要由盾壳摩擦以及土体损失引起，而竖向附加应力取决于土体损失； 2）盾构掘进会造成下方隧道产生“竖椭圆”分布的附加围压，上穿结束后围压和内力均有所减小，弯矩和剪力的减幅较大，轴力的变化较小； 3）在新建隧道局部穿越过程中，围压呈现出一个由左至右的平衡过程； 4）附加应力随新建隧道埋深的增大而不断增大，同时管片内力有不同程度的减小。

关键词： 盾构隧道; 上穿掘进; 既有隧道; 附加围压; 内力变化

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魏纲 , 冯非凡 , 齐永洁 , 华鑫欣 . 盾构隧道全过程穿越对下方既有隧道的影响研究[J]. 隧道建设, 2022 , 42(S2) : 69 -79 . DOI: 10.3973/j.issn.2096-4498.2022.S2.010

Abstract

To explore the stress variation law of the existing lower shield tunnel induced by shield tunneling, a computing model of shield crossing is established. Considering the additional thrust generated by soil loss induced by additional thrust on cutterhead, shell lateral resistance, additional grouting pressure, and the excavation, the realtime surrounding rock pressure of the existing shield tunnel is calculated using surrounding rock pressure redistribution theory, and the internal force is calculated using a modified routine method. Based on case study, the bending moment, axial force, and shear stress of the lower shield tunnel during shield tunneling process are analyzed, and the influence of tunnel buried depth is investigated. The results reveal the following: (1) The horizontal additional stress around the tunnel is mainly caused by the friction of the shield shell and soil loss, whereas the vertical additional stress is mainly caused by soil loss. (2) The shield tunneling will induce vertical oval distribution of additional surrounding rock pressure, and the surrounding rock pressure distribution and internal force of the existing shield tunnel decrease, the bending moment and shear stress decrease sharply, and the axial force changes slightly after shield tunnel crossing. (3) During local passing of the upper shield tunnel, the surrounding rock pressure of the existing shield tunnel shows a balance process from left to right. (4) The additional stress increases and internal stress of segment decreases diversely with an increasing buried depth of the new tunnel.

Key words： shield tunnel; uppenetration driving; existing tunnels; additional confining pressure; internal force change

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