近距离多线叠交盾构施工对既有隧道变形的影响研究

李磊; 张孟喜; 吴惠明; 王永佳

doi:10.11779/CJGE201406007

近距离多线叠交盾构施工对既有隧道变形的影响研究 English Version

1. 上海大学土木工程系,上海 200072; 2. 上海隧道工程股份有限公司,上海 200062

基金项目: 国家自然科学基金项目（41172238）

详细信息

作者简介:
李磊(1986- ),男,湖北荆门人,博士研究生,主要从事隧道及地下结构的研究。E-mail: smilelilei@126.com。

中图分类号: TU432；U455
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出版历程
- 收稿日期: 2013-09-22
- 发布日期: 2014-06-19

Influence of short-distance multi-line overlapped shield tunnelling on deformation of existing tunnels

1. Department of Civil Engineering, Shanghai University, Shanghai 200072, China; 2. Shanghai Tunnel Engineering Co., Ltd., Shanghai 200062, China

摘要

摘要: 针对上海地铁新建11号线先下后上近距离穿越既有4号线,形成三层隧道四线叠交的特殊工况,采用有限元数值模拟和现场监测相结合的方法,考虑既有隧道周围土压力的分布规律,研究了盾构下穿施工时土仓压力和注浆压力以及上穿施工时压重范围和压重量对既有隧道变形的影响。研究结果表明：下穿施工结束时,既有隧道的沉降量不随土仓压力比的改变而改变,但随注浆压力比的减小而增大；上穿施工应采取压重措施预防既有隧道的上浮和局部隆起变形,宜遵循新建隧道同步压重为主,既有隧道压重为辅的原则。
- 多线叠交隧道 /
- 盾构施工 /
- 土仓压力 /
- 注浆压力 /
- 既有隧道变形 /
- 现场监测
Abstract: Considering the complicated project of four-line overlapped tunnels in Shanghai metro construction, in which Metro Line 11 below-shield and above-shield crosses the existing Metro Line 4 successively, numerical modelling and in-situ monitoring are employed to study the influence of shield tunnelling on the deformation of the existing tunnels. According to the distribution law of earth pressure around the existing tunnels, the shield operation parameters are set to change with the advance of the EPB shield machine. Particular attention is paid to the effect of the chamber earth pressure and grouting pressure on the deformation of the existing tunnels during the below-shield tunnelling as well as the loading scope and its value during the above-shield tunnelling. The results show that the settlement of the existing tunnels stays at the same level as the chamber earth pressure ratio increases, while it increases with the decrease of the grouting pressure ratio. Construction measures, which follow the principle of synchronous loading in the new tunnel mainly and loading in the existing tunnel secondarily, should be taken to control the heave and partial uplift of the existing tunnels during the above-shield tunnelling.
- multi-line overlapped tunnel /
- shield tunnelling /
- chamber earth pressure /
- grouting pressure /
- existing tunnel deformation /
- in-situ monitoring

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参考文献(18)

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