地铁盾构隧道穿越桥梁下方群桩基础的托换与除桩技术研究

徐前卫; 朱合华; 马险峰; 马忠政

地铁盾构隧道穿越桥梁下方群桩基础的托换与除桩技术研究 English Version

(1. 同济大学道路与交通工程教育部重点实验室，上海 200092；2. 同济大学岩土及地下工程教育部重点实验室，上海 200092；3. 上海申通地铁集团有限公司，上海 200010)

基金项目: 中央高校基本科研业务费专项资金项目(1600219169)；同济大学岩土及地下工程教育部重点实验室开放基金资助项目（KLE-TJGE-B1108）

详细信息

作者简介:
徐前卫(1973– )，男，博士，副教授，主要从事隧道及地下结构工程领域的教学与科研工作。E-mail: xuqwtju@126.com。

中图分类号: TU473
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出版历程
- 收稿日期: 2011-06-26
- 发布日期: 2012-07-24

Pile underpinning and removing technology of shield tunnels crossing through group pile foundations of road bridges

(1. Key Laboratory of Road and Traffic Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 3. Shanghai Shentong Metro Co., Ltd., Shanghai 200030, China)

摘要

摘要: 针对上海地铁10号线曲阳路—溧阳路区间隧道穿越四平路沙泾港桥群桩基础这一工程案例，结合对既有桥梁结构形式、现场周边环境、施工条件以及作业空间的调研，提出了适合本工程的扩大板式基础托换以及盾构机直接切桩的施工方案。为了确保在桩基托换及刀盘切桩施工过程中桥梁结构的安全性和正常通行功能的发挥，通过理论分析和数值计算等手段，对桩基托换施工过程中桩基合理开挖暴露长度、桩—筏体系受力转换机理以及盾构切桩对上部结构的影响进行了研究。研究结果表明：地基加固及扩大板式基础托换法能够有效减小施工期间桥梁的沉降、改善桥梁结构的受力性态；由于原桩基承担荷载大都转移到托换后的筏板基础上，因此部分桩基的切除对桥梁结构的安全性影响不大；现场监测结果表明，施工过程中桥梁结构的沉降变形与计算结果吻合较好，说明本工程的方案制定合理、施工措施得当，桥梁结构处于安全范围之内。
- 软土 /
- 盾构隧道 /
- 桥梁 /
- 桩基托换 /
- 筏板基础 /
- 地基加固
Abstract: During the construction of Shanghai Metro line No. 10, the interval tunnel from Liyang Road Station to Quyang Road Station has to pass through the pile foundation of Shajinggang Bridge on Siping Road. Based on the survey of the existing bridge structure, surrounding environment, construction condition and working space, a proper construction scheme including pile underpinning with expanded raft and cutting pile directly with shield machine is proposed. In order to ensure the safety of bridge structure and the normal traffic capacity during the construction process, by means of the theoretical analysis and numerical simulation, the studies are carried out on reasonable excavation length of pile, load transfer mechanism of pile-raft system and the construction influence on bridge structure due to cutting pile, etc. The results show that the soil reinforcement and pile-raft underpinning can effectively reduce bridge settlement and improve the bridge loading state. Secondly, since the original load born by piles is mainly transferred to raft foundation, the residual part of the pile to be cut has little effect on the security of bridge structure. According to the field monitoring results, the settlement of bridge structure during the construction process is in good accordance with the calculated results, which indicates that the construction scheme is reasonable, the construction measures are appropriate and the bridge structure is in the allowable safety range.
- soft ground /
- shield tunnel /
- bridge /
- pile underpinning /
- raft foundation /
- foundation reinforcement

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参考文献(8)

[1]	IWASAKI Y, WATANABE H, FUKUDA M, et al. Construction control for underpinning piles and their behavior during excavation[J]. Géotechnique, 1994, 44(4): 681–689.
[2]	YAMAGUCHI I, YAMAZAKI I, KIRITANI Y. Study of ground-tunnel interactions of four shield tunnels drive in close proximity, in relation to design and construction of parallel tunnels[J]. Tunnelling and Underground Space Technology, 1998, 13(3): 289–304.
[3]	SHARMA J S, HEFNY A M, ZHAO J, et al. Effect of large excavation on deformation of adjacent MRT tunnels[J]. Tunnelling and Underground Space Technology, 2001(16): 93–98.
[4]	TAKAHASHI K, FUKAZAWA N, AGIWARA T, et al. Observational control of slurry shield tunnels with super close spacing under the nearby bridge abutments loads[J]. Tunnelling and Underground Space Technology, 2004(19): 390.
[5]	刘宝琛. 急待深入研究的地铁建设中的岩土力学课题[J]. 铁道建筑技术, 2000, 20(3): 1–3. (LIU Bao-chen. Problems on geomechanics in need of immediate deep research in subway construction[J]. Railway Construction Technology, 2000, 20(3): 1–3. (in Chinese))
[6]	吴波, 刘维宁, 索晓明, 等. 地铁隧施工近邻桥基加固效果三维数值分析[J]. 铁道工程学报, 2005, 89(5): 48–52. (WU Bo, LIU Wei-ning, SUO Xiao-ming, et al. Reaearch on the reinforcing effect of adjacent short pile bridge foundation in metro station construction[J]. Journal of Railway Engineering Society, 2005, 89(5): 48–52. (in Chinese))
[7]	丁红军, 王琪, 蒋盼平. 地铁盾构隧道桩基托换施工技术研究[J]. 隧道建设, 2008, 28(2): 209–212. (DING Hong-jun, WANG Qi, JIANG Pan-ping. Pile foundation underpinning technology applied in construction of shield-bored tunnels[J]. Tunnel Construction, 2008, 28(2): 209–212. (in Chinese))
[8]	杨晓杰, 邓飞皇, 聂雯. 地铁隧道近距穿越施工对桩基承载力的影响研究[J]. 岩石力学与工程学报, 2006, 25(6): 1290–1295. (YANG Xiao-jie, DENG Fei-huang, NIE Wen, et al. Study on effect of metro tunneling on carrying capacity of pile foundation[J]. Chinese Journal of Rock Mechanics and Engineering, 2006, 25(6): 1290–1295. (in Chinese))