桥梁桩基施工对近接桥墩变形的影响  

Influence of Bridge Pile Foundation Construction on the Deformation of Adjacent Bridge Piers

作　　者：高阳 周少博 GAOYang;ZHOU Shaobo(CCCC Highway Consultants Co.,Ltd.,Beijing 100010,China)

机构地区：[1]中交公路规划设计院有限公司,北京100010

出　　处：《黑龙江交通科技》2025年第2期44-49,共6页Communications Science and Technology Heilongjiang

摘　　要：桥梁工程是连通城市交通关键节点的重要建筑结构。随着我国城市化发展,城市用地紧张,不可避免地会出现新建桥梁临近现状桥梁施工的问题。以高速公路跨线桥工程为背景,采用数值仿真手段分析了桩基近接施工对既有桥墩的影响。结果表明:桩基施工产生的地层竖向沉降,基本以桩基施工区域为中心,向外呈锥形分布,1 cm的地层沉降区基本涉及所有桥墩。桩基-桥墩距离与水平位移基本呈现线性关系,桥墩最小水平位移位于与桩基距离最远的桥墩,为0.51 cm;最大水平位移位于与桩基距离最近的桥墩,为1.48 cm。桩基-桥墩距离与竖向位移基本呈现非线性关系,桥墩最小竖向位移位于与桩基距离最远的桥墩,为1.4 cm;最大竖向位移位于与桩基距离最近的桥墩,为2.76 cm。各桥墩的位移发展规律基本一致,均随着开挖工序的增加位移逐渐增加,且在桩基上部荷载施做后,桥墩位移出现明显增长。Bridge engineering is an important building structure that includes key nodes in the city transportation.With the development of urbanization in our country,urban land is tight,and it is inevitable that there will be close construction for the existing bridge projects.This article takes the expressway overpass bridge project as the background and uses numerical simulation methods to analysis the impact of pile foundation proximity construction on existing bridge piers.The results show that the vertical settlement of the stratum generated by pile foundation construction is mainly distributed in a conical shape outward from the pile foundation construction area,and the 1 cm stratum settlement zone basically involves all bridge piers.The distance between pile foundation and bridge pier shows a linear relationship with horizontal displacement,and the minimum horizontal displacement of the bridge pier is located at the pier farthest from the pile foundation,which is 0.51 cm;The maximum horizontal displacement is located at the bridge pier closest to the pile foundation,which is 1.48 cm.The distance between pile foundation and bridge pier shows a non-linear relationship with vertical displacement,with the minimum vertical displacement of the bridge pier is located at the pier farthest from the pile foundation,which is 1.4 cm;The maximum vertical displacement is located at the bridge pier closest to the pile foundation,which is 2.76 cm.The displacement development law of each bridge pier is basically the same,which gradually increases with the increase of excavation process,and after the load is applied on the upper part of the pile foundation,the displacement of the bridge pier shows a significant increase.

关 键 词：桥墩 桩基 近接施工 位移 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]