新建隧道上跨既有盾构隧道工程安全性分析  

Safety Studies of the New Constructed Tunnel Overpass the Existing Tunnels

作　　者：李京彬 赵猛 檀超 LI Jingbin;ZHAO Meng;TAN Chao(Hefei Transit Transportation Group Co.Ltd.,Hefei 230001;Beijing Anjie Engineering Consulting Co Ltd.,Beijing 100050)

机构地区：[1]合肥市轨道交通集团有限公司,合肥230001 [2]北京安捷工程咨询有限公司,北京100050

出　　处：《土工基础》2024年第6期913-920,共8页Soil Engineering and Foundation

摘　　要：为研究盾构隧道上跨工程对既有交通线的影响,以合肥市轨道交通4号线南延线复兴路站~北雁湖站区间上跨既有4号线科大先研院站~北雁湖站区间盾构隧道工程为例,通过数值模拟,结合实测分析的方法,研究新建隧道上跨工程施工中既有交通线的变形响应情况。结果表明:新建盾构隧道会破坏土体既有平衡,引起土体卸载回弹,因此既有交通线隧道和联络通道主要发生竖向隆起变形。通过对实际工况模拟计算,得出区间隧道竖向最大变形为2.074 mm,联络通道竖向最大变形为2.075 mm;根据既有隧道结构安全控制要求,并结合实测数据分析显示,模拟结果与实测数据均小于预警值3 mm,模拟计算中既有区间隧道处于安全稳定状态。In order to study the impact of over pass of a proposed tunnel on the existing transportation lines,the shield tunneling project in the interval from Fuxing Road Station to Beiyanhu Station on the southern extension line of Line No.4 of Hefei Rail Transit is presented as the case history.The proposed project crosses the existing Line No.4 from the Science and Technology University Research Institute Station to the Beiyanhu Station.The numerical simulation combined with field measurements are used to investigate the deformation response of the existing transportation lines during the construction of the new tunnel.The results show that the construction of the new shield tunnel will disrupt the existing soil balance,causing the unloading rebound of the soil,thus resulting in the vertical uplift deformation primarily in the existing transportation lines and connection channels.Through the simulation based on the actual operating conditions,it is found that the maximum vertical deformation of the interval tunnel is 2.074mm,and the maximum vertical deformation of the connection channel is 2.075mm.According to the safety control requirements of the existing tunnel structure and the analysis based on the field measurements,both the simulation results and the measured data are below the warning threshold of 3mm,indicating that the existing interval tunnel is in a safe and stable state according to the simulation calculations.

关 键 词：盾构工程 上跨 数值模拟 实测分析 

分 类 号：U456[建筑科学—桥梁与隧道工程]