摘要
为研究双线盾构隧道下穿施工对高架桥结构变形的影响,以郑许市域铁路下穿新郑机场T1航站楼高架桥工程为背景,采用有限元软件Midas GTS建立数值模型,模拟双线盾构隧道施工全过程。通过对比数值模拟结果与现场监测数据,验证了模型的可靠性,并分析了高架桥变形发展规律及其与工程规范控制标准的符合性。研究结果表明:高架桥墩台变形特征受左右线隧道相对位置和施工进度影响显著;双线隧道贯通后,ZQ11 a墩台最大沉降量为2.265 mm,纵向相邻墩台ZQ08a与ZQ09a间最大沉降差为0.963 mm,横向相邻墩台ZQ08a与ZQ08b间最大沉降差为1.487 mm,ZQ08a承台最大水平位移为0.792 mm,各项变形指标均满足规范控制标准要求,能够保障T1航站楼落客平台高架桥的正常运营。本文研究成果深化了对双线盾构隧道下穿施工过程的理解和认识,可为类似隧道工程施工与安全管理提供参考。
In order to study the impact of double-line shield tunnel underpass construction on the structural deformation of viaducts,a numerical model is established by using finite element software Midas GTS to simulate the whole process of double-line shield tunnel construction based on the viaduct project of Zhengxu municipal railway under Xinzheng airport T1 Terminal.By comparing the numerical simulation results with the on-site monitoring data,the reliability of the model is verified,and the deformation development law of the viaduct and its conformity with the engineering code control standard are analyzed.The results show that the deformation characteristics of viaduct piers and abutments are significantly affected by the relative position of the left and right line tunnels and the construction progress.After the double-track tunnel is completed,the maximum settlement of ZQ11 a pier is 2.265 mm,the maximum settlement difference between longitudinal adjacent piers ZQ08a and ZQ09a is 0.963 mm,the maximum settlement difference between transverse adjacent piers and abutments ZQ08a and ZQ08b is 1.487 mm,and the maximum horizontal displacement of ZQ08a is 0.792 mm.All deformation indicators meet the requirements of the specification control standards,which can ensure the normal operation of the viaduct of the passenger drop-off platform in Terminal 1.The results deepen the understanding and awarenessof the underpass construction process of double-line shield tunnels,and can provide references for the construction and safety management of similar tunnel projects.
作者
咸庆军
王仙妹
豆海涛
樊志远
张斌
张浩然
XIAN Qingjun;WANG Xianmei;DOU Haitao;FAN Zhiyuan;ZHANG Bin;ZHANG Haoran(School of Civil Engineering,Henan University of Technology,Zhengzhou 450001,Henan,China;China Railway 4th Survey and Design Institute Group Co.,Ltd.,Wuhan 430063,Hubei,China)
出处
《工程建设》
2025年第9期38-44,共7页
Engineering Construction
基金
河南省自然科学基金资助项目(242300420017)
国家自然科学基金资助项目(51708181)
河南工业大学创新基金支持计划资助项目(2022ZKCJ05)。
关键词
盾构隧道
高架桥
桥梁墩台
变形特征
现场监测
有限元模拟
shield tunnel
viaduct
bridge pier and abutment
deformation characteristics
finite element simulation
on-site monitoring
