近距离管道基坑对运营地铁高架结构的影响  

Impact of Short-distance Pipeline Foundation Pit on Elevated Structure of In-operated Subway

作　　者：季凡凡 李亚明 JI Fanfan;LI Yaming

机构地区：[1]中国市政工程华北设计研究总院有限公司,天津市300202

出　　处：《城市道桥与防洪》2022年第4期228-231,M0019,M0020,共6页Urban Roads Bridges & Flood Control

摘　　要：超近距离基坑开挖通常会导致紧邻的地铁高架桥基础产生一定的变形,但目前超近距离市政管道基坑开挖对地铁高架桥影响的研究较少。针对天津地铁1号线某高架桥特别保护区内市政管道基坑展开工程实测,结合Plaxis3D有限元分析软件建立三维数值模型,对比分析了超近距离市政管道基坑对运营地铁高架桥墩的影响。分析结果表明:在距离桥梁承台最近位置(距离1 m)处,通过采用水泥土搅拌桩加固的措施,有效控制了基坑引起的水平变形,桥墩最大水平变形为0.7 mm,满足轨道交通结构允许位移量20 mm的要求。Excavation of ultra-short-distance foundation pits usually results in certain deformations of the adjacent subway viaduct foundation.However,there is less study on the impact of excavating the ultra-short-distance municipal pipeline foundation pit on subway viaducts.Aiming at the municipal pipeline foundation pit in a special protection area of a viaduct in Tianjin Metro Line 1,the actual measurement of the project is carried out.A three-dimensional numerical model is established in combination with the Plaxis3D finite element analysis software to compare and analyze the impact of the ultra-short-distance municipal pipeline foundation pit on the elevated bridge piers of the in-operated subway.The analysis results show that at the closest position(distance 1 m)from the base slab of bridge,the horizontal deformation caused by the foundation pit is effectively controlled by the cement-soil mixing pile reinforcement measures.The maximum horizontal deformation of the bridge pier is 0.7 mm,which meets the allowable displacement(20 mm)of the rail transit structure.

关 键 词：管道沟槽基坑 地铁高架桥 桥墩 特别保护区 

分 类 号：TU990.3[建筑科学—市政工程]