地铁隧道下穿桥梁桩基托换变形与力学特性  

Deformation and Mechanical Characteristics of Pile Foundation Buttresses for Bridges under Metro Tunnels

作　　者：程家军 刘远明 郑滔 王文杰 牙兰开 王忠星 田茂亮 杨超 CHENG Jia-jun;LIU Yuan-ming;ZHENG Tao;WANG Wen-jie;YA Lan-kai;WANG Zhong-xing;TIAN Mao-liang;YANG Chao(School of Civil Engineering,Guizhou University,Guiyang 550025,China;Key Laboratory of Geotechnical and Engineering Safety of Guizhou Province,Guiyang 550025,China;Guizhou Transportation Planning Survey and Design Academe Co.,Ltd.,Guiyang 550081,China)

机构地区：[1]贵州大学土木工程学院,贵阳550025 [2]贵州省岩土力学与工程安全重点实验室,贵阳550025 [3]贵阳市公共交通投资运营集团有限公司,贵阳550081

出　　处：《科学技术与工程》2024年第36期15665-15675,共11页Science Technology and Engineering

基　　金：贵州省科学技术基金(黔科合基础-ZK[2022]一般082,黔科合基础[2019]1057号);贵阳城市轨道交通科研项目(GD3-FW-YJ-05-2020-13-ZB)。

摘　　要：地铁建设的快速发展不可避免地会造成地铁线路与既有桥梁桩基的交叉工程冲突,为保证高架桥的安全和同步完成地铁隧道的施工,需对高架桥进行桩基托换。以贵阳市轨道交通3号线花果园西站—花果园东站区间隧道下穿贵黄路高架桥为研究对象,利用有限元软件对桩基托换全过程和隧道施工穿越过程进行了数值模拟,并与现场监测数据相对比分析,验证数值模拟结果的准确性,并研究托换过程中桥梁变形与桩基受力变化规律。结果表明:采用被动托换技术和托换承台作为承载结构对桥梁进行桩基托换,桥梁上部结构荷载在既有桩截断后能有效传递给托换体系,桥墩呈先隆起后沉降再趋于稳定的规律,桥梁与桩基变形与托换体系受力均在安全范围内,托换桩受力与沉降并不均匀;隧道施工穿越并未对新建托换体系造成太大影响,该桩基托换方案是安全可行的。The meteoric expansion of metro construction will inevitably lead to conflicts emerging between the metro line and the current bridge pile foundation.To uphold the safety of the viaduct and guarantee the concurrent conclusion of the metro tunnel s construction,the replacement of the pile foundation on the viaduct becomes paramount.The underpass of the Guihuang Road viaduct in the section tunnel between Huaguoyuan West Station and Huaguoyuan East Station of Guiyang Metro Line 3 was taken as the research object.Employing finite element software,a numerical simulation encompassing the entire process of pile foundation replacement and tunnel construction was executed.By juxtaposing this with field monitoring data,the precision of the simulation results was thoroughly analyzed and confirmed.Furthermore,a thorough examination of the bridge s deformation patterns and the pile foundation s force variations during the replacement process was conducted.The results show that the utilization of passive replacement technology and a replacement bearing platform as the bridge s bearing structure during pile replacement effectively redirects the bridge superstructure load to the replacement system upon the truncation of existing piles.Initially,the abutment experiences a rise,followed by settlement,and ultimately stabilization,with both the bridge deformation and the replacement system s force remaining within safe thresholds.However,it is observed that the force and settlement of the replacement pile are not uniform.Remarkably,the tunnel s construction crossing has minimal impact on the new replacement system,indicating that the pile foundation replacement scheme is not only safe and feasible,but also has minimal implications for the integrity of the new system.

关 键 词：桩基托换 数值模拟 地铁隧道 监测数据 

分 类 号：U455[建筑科学—桥梁与隧道工程]