岩土力学2012，Vol.33Issue(4)：1109-1116,1140,9.
基坑开挖对下卧运营地铁既有箱体影响的实测及分析
Field measurement and analysis of effect of excavation on existing tunnel boxes of underlying metro tunnel in operating
摘要
Abstract
The Xiqing Road Tunnel of Tianjin West Railway Station Hub crosses over the existing tunnel boxes of the operating Tianjin Metro Line 1. The bottom plate of the Xiqing Road Tunnel is just 0.3 m away from the upper plate of the existing tunnel boxes, so the deformation of existing metro tunnel due to construction should be controlled strictly. The design bring forward some pertinence construction plans and measures, including ground improvement, excavation in sections and back pressure of heaped load timely. Base on the analysis of monitoring data during the construction and excavation of anti-floating piles and triaxial cement mixing pile of Xiqing Road Tunnel adjacent to the existing metro tunnel, and the corresponding deformation rules and characteristics in the different stages are summarized. The measured results show that the construction of bored piles adjacent to the existing metro tunnel could lead to the tunnel settlement, while the excavation could cause the heave of the tunnel. Due to excavation in sections, Back pressure of heaped load as well as the observational method, the vertical deformation of existing tunnel caused by excavation and the different deformation between the two adjacent boxes can be controlled effectively.关键词
运营地铁线路/基坑开挖/地基加固/堆载回压/变形控制Key words
operating metro line/ excavation/ ground improvement/ back pressure of heaped load/ deformation control分类
建筑与水利引用本文复制引用
郑刚,刘庆晨,邓旭,张立明..基坑开挖对下卧运营地铁既有箱体影响的实测及分析[J].岩土力学,2012,33(4):1109-1116,1140,9.基金项目
国家重点基础研究发展计划(973计划)资助项目(No.2010CB732106). （973计划）
