四洞交叠盾构隧道近距离下穿既有桥梁桩基施工控制技术研究
Construction control technology of a four-hole shield tunnel passing through pile foundations of an existing bridge:A case study
雷明锋 1石渊博 2唐钱龙 2孙宁新 3唐志辉 4龚琛杰2
作者信息
- 1. School of Civil Engineering,Central South University,Changsha 410075,China;Key Laboratory of Engineering Structure of Heavy Haul Railway,Changsha 410075,China
- 2. School of Civil Engineering,Central South University,Changsha 410075,China
- 3. School of Civil Engineering,Central South University,Changsha 410075,China;Shandong Provincial Communications Planning and Design Institute Group Co.,Ltd.,Jinan 250031,China
- 4. China Railway Liuyuan Group Co.,Ltd.,Tianjin 300308,China
- 折叠
摘要
在密集的城市建筑环境中,在城市地下交通的大规模兴建过程中不可避免地会出现各类近接施工工程.依托一实际工程,针对四洞交叠盾构隧道近距离下穿既有桥梁桩基施工控制技术开展实践研究,总结提出了"两阶段法理论预测+主动控制与被动保护"的近接施工微扰动控制技术体系.该技术体系的核心内容包括:1)通过引入附加地层损失率,建立多线隧道近接施工时桩基变形的理论计算方法,实现近接施工对邻近建(构)筑物影响的工前预测.2)建立隧道-地层-桩基多元耦合模型,分析四线交叠盾构隧道施工全过程力学行为.3)结合工程实践经验,分别从主动控制和被动保护两方面提出依托工程的控制措施.在依托工程开挖完成过程中,邻近桥梁桩基变形得到有效控制,表明所提出的近接施工微扰动控制技术是合理可行的.
Abstract
In dense urban building environments,various adjacent construction projects will inevitably occur during the large-scale construction of urban underground transportation projects.Based on an actual project,this paper conducted a practical study on the construction control technology of a four-hole shield tunnel passing through existing bridge-pile foundations over a short distance and proposed a micro-disturbed control technology system of"two-stage analysis method theoretical prediction + active control and passive protection".The core content of the technology system included the following:1)By introducing an additional ground loss ratio,a theoretical calculation method for predicting the deformation of pile foundations during the adjacent construction of a multi-line tunnel was established,which enabled the preconstruction prediction of the influence of construction on the adjacent structures.2)A multi-coupled numerical model,which included tunnels,strata,and pile foundations,was developed to analyze the mechanical behavior of the pile foundations during the entire construction process.3)Combined with practical engineering experience,the control measures of this project were implemented in terms of active control and passive protection.The deformation of the pile foundations was effectively controlled during the construction process,which certified that the proposed micro-disturbed control technology was reasonable and feasible.
关键词
盾构隧道/桥梁桩基/下穿施工/主动控制/被动保护Key words
shield tunnel/bridge-pile foundation/underpass construction/active control/passive protection引用本文复制引用
基金项目
National Natural Science Foundation of China(51978669)
Natural Science Foundation of Hunan Province,China(2021JJ30825)
出版年
2023
NETL
NSTL
维普
万方数据