深埋地铁隧道对临近桥梁桩基的扰动分析  

Disturbance Analysis of Deep Buried Subway Tunnel on Adjacent Bridge Pile Foundation

作　　者：张军[1] ZHANG Jun(China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,Sichuan,China)

机构地区：[1]中铁二院工程集团有限责任公司,四川成都610031

出　　处：《工程技术研究》2024年第7期20-23,34,共5页Engineering and Technological Research

摘　　要：为探究深埋地铁隧道施工期及运营期对临近桥梁桩基的影响,文章依托深圳地铁某盾构隧道区间穿越节点,建立了三维有限元盾构穿越施工模型和地铁振动分析模型,总结了施工期盾构穿越诱发的桩基变形和弯矩分布规律,分析了“扩台增桩”加固对穿越扰动的抑制效果,探讨了运维期地铁振动对桩基变形的影响规律。研究结果表明,“扩台增桩”加固在隧道穿越桥梁桩基时可减小桩顶沉降和最大横向位移,在复合地层中对最大横向位移的抑制作用更明显;在运营期间,地铁振动荷载对临近桩基横向位移的影响较小。In order to explore the influence of deep-buried subway tunnel construction period and operation period on adjacent bridge pile foundation,a three-dimensional finite element shield crossing construction model and subway vibration analysis model are established based on a shield tunnel section crossing node of Shenzhen subway.The distribution law of pile foundation deformation and bending moment induced by shield crossing during construction period is summarized.The suppression effect of"expanding platform and increasing pile"reinforcement on crossing disturbance is analyzed.The influence of subway vibration on pile foundation deformation during operation and maintenance period is discussed.The results show that the reinforcement of"expanding platform and increasing pile"can reduce the settlement of pile top and the maximum lateral displacement when the tunnel passes through the bridge pile foundation,and the inhibition effect on the maximum lateral displacement is more obvious in the composite stratum.During the operation period,the subway vibration load has little effect on the lateral displacement of the adjacent pile foundation.

关 键 词：地铁隧道 桥梁桩基 扰动分析 地铁振动 桩基变形 

分 类 号：U231[交通运输工程—道路与铁道工程]