深大基坑开挖对邻近高架桩基影响的数值与实测分析  

Numerical and Measurement Analysis of the Influence of Deep and Large Foundation Pit Excavation on Adjacent Viaduct Pile Foundation

作　　者：朱朋佳 陆达鹏 孟飞 张建威 谷孟辉 石艳柯 Zhu Pengjia;Lu Dapeng;Meng Fei;Zhang Jianwei;Gu Menghui;Shi Yanke(China Railway Seventh Bureau Group Fifth Engineering Co.,Ltd.,Zhengzhou 450016,China;School of Civil Engineering and Communications,North China University of Water Resources and Electric Power,Zhengzhou 450045,China)

机构地区：[1]中铁七局集团第五工程有限公司,郑州450016 [2]华北水利水电大学土木与交通学院,郑州450045

出　　处：《科技通报》2024年第7期62-69,共8页Bulletin of Science and Technology

基　　金：河南省重点研发与推广专项(科技攻关)项目(232102321096)。

摘　　要：为研究深大基坑开挖对邻近高架桥桩的影响,本文以郑州地铁7号线陈砦站基坑工程为背景,利用数值模拟研究深大基坑开挖时不同支护体系和支护参数对邻近高架桥桩基的影响,并结合现场实测数据验证数值模拟结果的可靠性。研究结果表明:地连墙的厚度越大,邻近桥桩的水平位移和竖向位移越小,呈现出“负相关”关系,地连墙厚度的变化对桥桩的影响效应主要体现在竖向位移上;内支撑预加轴力的存在,能够控制邻近桥桩水平位移的变化,但改变预加轴力对邻近桥桩位移的控制效果弱于改变地连墙厚度;基坑开挖过程中,各邻近桥桩的竖向位移均呈现出“先沉降、后上升”的变化趋势,主要影响区域为基坑附近18 m(1倍基坑开挖深度)。In order to study the influence of deep and large foundation pit excavation on adjacent viaduct piles,taking the Chenzhai Station of Zhengzhou Metro Line 7 as the project background,numerical simulation was used to study the influence of different support systems and parameters on adjacent pile foundations during deep and large foundation pit excavation.The reliability of the numerical simulation results was verified with on-site measured data.The research results indicate that the greater the thickness of the diaphragm wall,the smaller the horizontal and vertical displacement of adjacent viaduct piles,showing a"negative correlation"relationship.The impact of the thickness change of the diaphragm wall on the bridge piles is mainly reflected in the vertical displacement;The presence of pre applied axial force on the internal support can control the horizontal displacement of adjacent bridge piles,but the effect of changing the pre applied axial force on the displacement of adjacent bridge piles is weaker than changing the thickness of the diaphragm wall;During the excavation process of the foundation pit,the vertical displacement of adjacent bridge piles shows a trend of"settling first and then rising",with the main impact area being 18 m(one time the excavation depth of the foundation pit)near the foundation pit.

关 键 词：基坑开挖 桩基础 数值模拟 地连墙 预加轴力 

分 类 号：TU470[建筑科学—结构工程]