基坑施工对邻近桥梁桩基变形的影响分析  

Analysis of the Influence of Foundation Pit Construction on Deformation of Adjacent Bridge Pile Foundations

作　　者：张文华 ZHANG Wenhua(China Railway 18th Bureau Group 5th Engineering Co.,Ltd.,Tianjin 300450,China)

机构地区：[1]中铁十八局集团第五工程有限公司,天津300450

出　　处：《现代交通技术》2025年第1期79-83,共5页Modern Transportation Technology

摘　　要：一些新建通道工程因存在过街需求,常会下穿既有沿线桥桩。以某新建通道基坑为例,使用midas GTS建立模型,并通过改变基坑深度,分析了通道施工对邻近桥桩变形、受力等的影响。计算结果表明:①通道基坑开挖深度增大,坑外土体变形增大,以水平变形为主;②通道基坑开挖深度由12 m增加到14 m相比由10 m增加到12 m,坑外土体变形增幅变大;③通道基坑开挖引起的邻近桥桩(墩)最大水平位移略大于最大竖向位移;④通道基坑开挖使邻近桥桩(墩)产生的最大轴力明显大于最大弯矩和最大剪力,最大剪力略大于最大弯矩。同时将模型计算结果与现场实测数据进行对比,为类似工程提供参考。Because of the need of crossing the street,some new passage projects often cross the existing bridge piles along the line.Taking a new channel foundation pit as an example,midas GTS is used to build a model,and the influence of chan-nel construction on the deformation and stress etc.of adjacent bridge piles is analyzed by changing the depth of foundation pit.The calculation results show that:①with the increase of the excavation depth of the channel foundation pit,the deformation of the soil outside the pit increases,mainly horizontal deformation;②when the excavation depth of channel foundation pit increa-ses from 12 m to 14 m,the increase of soil deformation outside is larger than that from 10 m to 12 m;③the maximum horizon-tal displacement of adjacent bridge piles(piers)caused by the excavation of channel foundation pit is slightly greater than the maximum vertical displacement;④the maximum axial force of adjacent bridge piles(piers)caused by the excavation of channel foundation pit is obviously greater than the bending moment and shear force,and the maximum shear force is slight-ly greater than the bending moment.In addition,the model calculation results are compared with the field measured data to provide reference for similar projects.

关 键 词：邻近基坑 桥桩 变形 

分 类 号：U455[建筑科学—桥梁与隧道工程]