层状地基新建隧道上穿引起盾构隧道纵向变形耦合分析  

Coupling Analysis of Longitudinal Deformation of Shield Tunnel Caused by Overcrossing Tunneling in Layered Soils

作　　者：于东东 李忠超 梁荣柱[1,2,3,4] 张志伟 梅娇鑫 肖铭钊 吴文兵 高坤[3,4] YU Dongdong;LI Zhongchao;LIANG Rongzhu;ZHANG Zhiwei;MEI Jiaoxin;XIAO Mingzhao;WU Wenbing;GAO Kun(Faculty of Engineering,China University of Geosciences,Wuhan 430074,Hubei,China;Wuhan Municipal Construction Group Co.,Ltd.,Wuhan 430023,Hubei,China;Anhui Province Institute of Building Research&Design,Hefei 230031,Anhui,China;Anhui Key Laboratory of Green Building and Assembly Construction,Hefei 230031,Anhui,China;Harbin University of Science and Technology,Harbin 150006,Heilongjiang,China)

机构地区：[1]中国地质大学(武汉)工程学院,湖北武汉430074 [2]武汉市市政建设集团有限公司,湖北武汉430023 [3]安徽省建筑科学研究设计院,安徽合肥230031 [4]绿色建筑与装配式建造安徽省重点实验室,安徽合肥230031 [5]哈尔滨理工大学,黑龙江哈尔滨150006

出　　处：《隧道建设（中英文）》2023年第5期804-815,共12页Tunnel Construction

基　　金：住房和城乡建设部科学技术计划项目(2021-K-074);武汉市市政建设集团有限公司科研计划(wszky202013);湖北省建设科技计划项目(2020-22);湖北省教育厅科学研究计划指导性项目(B2021002);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)。

摘　　要：为准确预测新建隧道上穿作用下既有盾构隧道的隆起位移,考虑土体的天然成层性,提出成层地基中新建隧道上穿作用下盾构隧道纵向位移的解析解答。首先,分析盾构隧道与周围土体的相互作用,构建盾构隧道与土体的整体耦合平衡方程。其次,基于Mindlin解求得新建隧道开挖卸荷作用下下部成层地基土的隆起位移,结合耦合平衡方程得到盾构隧道的纵向位移解。最后,与3个上穿工程实测数据进行对比,对相关参数进行分析。结果表明:1)当既有隧道下部地基分层性不明显,前人基于弹性地基梁的预测方法与本文方法均能较好预测下部隧道的隆起位移;2)当地层具有明显分层时,所提方法预测结果与实测结果具有较好的一致性;3)增大新建隧道直径将导致既有盾构隧道隆起位移的增加和隆起范围的增大;4)减小新建隧道与下卧隧道之间的穿越净距将导致下部盾构隧道的隆起值增加;5)既有盾构隧道位于上软下硬地层之上时,其隆起范围小于上硬下软地层,但其隆起量大于上硬下软地层。In this study,considering the natural stratification of the stratum,an analytical solution for the longitudinal displacement of a shield tunnel associated with an overcrossing tunneling in layered soils is proposed.The proposed solution can accurately predict the heave of the existing shield tunnel due to the overcrossing tunneling.First,the interaction between the shield tunnel and surrounding soil is analyzed and the overall coupling equilibrium equation between them is established.Second,based on Mindlin′s solution,the uplift displacement of the underlying layered soils due to unloading pressure induced by the excavation of a new tunnel is obtained.Moreover,the longitudinal displacement of the shield tunnel is obtained by combining with the overall coupling equilibrium equation.Finally,the results obtained using the proposed method are compared with the measurement data from three overcrossing projects,and the related parameters are analyzed.The results indicate the following:(1)Previous prediction methods based on elastic foundation beams and the proposed method satisfactorily predict the tunnel heave in the case of minimal stratification of the ground beneath the existing tunnel.(2)The predicted results from the proposed method concur with the measurements in the case of remarkable stratification of the ground.(3)Increasing the tunnel diameter will increase the uplift displacement and widen the range of the tunnel heave.(4)Reducing the clearance between the new tunnel and the existing tunnel increases the tunnel heave.(5)When the existing tunnel is located on the upper soft and lower hard strata,its uplift range is smaller but its uplift magnitude is greater than that of the upper hard and lower soft strata.

关 键 词：新建隧道 既有盾构隧道 上穿隧道施工 隧道隆起 耦合分析方法 

分 类 号：U45[建筑科学—桥梁与隧道工程]