摘要
为了探讨新建隧道下穿施工对上部既有隧道的影响,以上海某工程为例,建立三维数值分析模型,研究了新建隧道下穿施工过程中既有隧道的沉降变形规律。研究结果表明,既有隧道随着下穿隧道的开挖而持续性沉降,中点处为沉降最大位置,整体上呈左右对称状,下穿隧道开挖面过叠交处16环后继续开挖对上部既有隧道沉降无影响,最终沉降是下部隧道过叠交处时的1.8倍左右,过叠交处后的开挖扰动对上部隧道有巨大影响,最后通过与现场实测数据进行对比验证了数值模拟的正确性。
In order to explore the influence of new tunnel underpass construction on existing tunnel,taking a project in Shanghai as an example,a three-dimensional numerical analysis model was established to study the settlement and deformation of the existing tunnel in the process of new tunnel underpass construction.The research results show that the settlement of the existing tunnel is continuous with the excavation of the underpass tunnel.The middle point is the largest settlement position,which is symmetrical on the whole.The excavation of the underpass tunnel after the excavation surface passes through the overlap of 16 rings has no effect on the settlement of the upper existing tunnel.The final settlement is about 1.8 times of that when the new tunnel underpasses through the overlap.The excavation disturbance after the overlap has a huge impact on the upper tunnel.Finally,the correctness of the numerical simulation was verified by comparing with the field measured data.
作者
杨满仓
YANG Mancang(The 3rd Engineering Co.,Ltd.,of China Railway 12th Bureau Group,Shanxi Taiyuan 030024 China)
关键词
隧道
下穿
开挖
沉降
tunnel
underpass
excavation
settlement
