新建隧道上穿引起既有盾构隧道纵向隆起分析  

Longitudinal Uplift Analysis of Existing Shield Tunnel Induced by New Overcrossing Tunnel

作　　者：高坤[1,2] 苏校锋 张志伟 梁荣柱 李忠超 郭杨[1,2,3] 乐腾胜 GAO Kun;SU Xiaofeng;ZHANG Zhiwei;LIANG Rongzhu;LI Zhongchao;GUO Yang;YUE Tengsheng(Anhui Province Institute of Building Research&Design,Hefei 230031,Anhui,China;Anhui Key Laboratory of Green Building and Assembly Construction,Hefei 230031,Anhui,China;Faculty of Engineering,China University of Geosciences,Wuhan 430074,Hubei,China;Wuhan Municipal Construction Group Co.,Ltd.,Wuhan 430023,Hubei,China)

机构地区：[1]安徽省建筑科学研究设计院,安徽合肥230031 [2]绿色建筑与装配式建造安徽省重点实验室,安徽合肥230031 [3]中国地质大学(武汉)工程学院,湖北武汉430074 [4]武汉市市政建设集团有限公司,湖北武汉430023

出　　处：《隧道建设（中英文）》2023年第5期770-778,共9页Tunnel Construction

基　　金：安徽省住房城乡建设科技计划项目(2020-YF44);绿色建筑与装配式建造安徽省重点实验室开放课题(2021-JKYL-004);安徽建工集团2021年度科研立项项目(2021-52ZC);住房和城乡建设部科学技术计划项目(2021-K-074);武汉市政集团科研项目(wszky202013);湖北省建设科技计划项目(2020-22)。

摘　　要：为准确预测新建隧道上穿引起既有盾构隧道的纵向变形,首先,引入可以更加合理地模拟隧道-土体相互作用的Kerr地基模型,将既有隧道简化为Kerr地基上的Euler-Bernoulli梁;其次,基于Mindlin解得到新建隧道开挖引起既有隧道轴线处的附加应力;然后,基于有限差分法求得新建隧道上穿引起既有盾构隧道纵向变形解答;最后,通过3个工程案例验证该方法的有效性,并对部分参数进行分析讨论。研究结果表明:该方法较Winkler地基和Pasternak地基方法更能准确地预测新建隧道上穿引起既有盾构隧道的纵向变形。参数分析结果表明:新建隧道直径的增加会同时增大既有隧道的隆起值和影响范围,而净距的增加会略微降低既有隧道的隆起值,但不会缩小既有隧道的影响范围。在实际工程中,当新建隧道以大断面或小净距上穿开挖时,应加强对既有盾构隧道的变形监测和保护。To accurately predict the longitudinal deformation of an existing shield tunnel caused by newly-built overcrossing tunnel,the Kerr foundation model is introduced that can more reasonably simulate the tunnel-soil interaction and the existing tunnel is simplified as the Euler-Bernoulli beam on the Kerr foundation.Then,based on the Mindlin solution,the additional stress generated on the axis of the existing tunnel by the newly-built tunnel excavation is determined.Furthermore,based on the finite difference method,the solution of longitudinal deformation of the existing shield tunnel induced by the overcrossing of the newly-built tunnel is obtained.Finally,three engineering cases are used to verify the effectiveness of the proposed method,and some parameters are analyzed and discussed.The results show that the proposed method can predict the longitudinal deformation of the existing shield tunnel induced by the new tunnel overcrossing more accurately than predicted by the Winkler and Pasternak foundation models.The results of the analytical parameters reveal that with the increase in the newly-built tunnel′s diameter,the uplift value and influence range of the existing tunnel increase simultaneously,while the increase in the clearance slightly reduces the uplift value of the existing tunnel,but does not affect the influence range of the existing tunnel.Thus,deformation monitoring and safety measures should be adopted for the existing tunnels when a newly-built tunnel is crossing above with a large cross-section or small clearance.

关 键 词：新建隧道 既有盾构隧道 纵向变形 EULER-BERNOULLI梁 Kerr地基模型 

分 类 号：U45[建筑科学—桥梁与隧道工程]