摘要
上海某地块基坑工程位于三条区间隧道正上方,坑底与隧道顶的距离为9m,场址区域微承压水和承压水连通,风险较大。为保障施工过程中地铁结构安全,在基坑设计、施工时中采取了严格的地铁保护措施。记录基坑开挖过程中隧道变形数据,分析开挖卸载对隧道结构的变形影响;并针对上方卸载进行了数值模拟,重点分析基坑开挖对隧道隆起的影响,探讨施工过程中基坑卸荷量对应的隧道隆起量,对施工过程进行严格控制。监测数据和分析结果表明,通过分块、加固、加桩、限时挖土形成底板等措施,可将隧道隆起量控制在1‰以内。
The foundation pit project in a plot in Shanghai is located directly above three running tunnels,where the distance between the pit bottom and the tunnel top is 9 m and the micro-confined water and confined water are connected in the site area and poses a high risk.Strict protection measures were taken in design and construction of the foundation pit in order to ensure the safety of metro structure during construction.The tunnel deformation data were recorded during foundation pit excavation and the influence of excavation and unloading on the deformation of tunnel structure was analyzed;moreover,numerical simulation was carried out for upper unloading to mainly analyze the influence of foundation pit excavation on tunnel uplift,discuss the tunnel uplift corresponding to the foundation pit unloading in the construction process and strictly control the construction process.The monitored data and analysis results show that the tunnel uplift could be controlled within 1‰by such measures as blocking,reinforcement,pile addition and bottom plate formed by excavation in a limited time.
作者
贺晓杰
HE Xiaojie(Shanghai Shentong Metro Group Co.,Ltd.,Shanghai 201103)
出处
《现代隧道技术》
CSCD
北大核心
2021年第S01期251-257,共7页
Modern Tunnelling Technology
关键词
基坑工程
地铁隧道
隆起
变形控制
数值模拟
Foundation pit engineering
Subway tunnel
Heaving
Deformation control
Numerical simulation
