基坑开挖对下方近距离隧道的保护  

Measures of preventing the in use tunnel disaster caused by overhead excavation

作　　者：毛朝辉[1] 刘国彬[1] 

机构地区：[1]同济大学地下系,上海200092

出　　处：《浙江工业大学学报》2005年第5期534-537,共4页Journal of Zhejiang University of Technology

基　　金：上海市科学技术委员会资助项目(03QMH1411)

摘　　要：随着城市建设的高速发展,出现了不少在地铁隧道上方的基坑开挖,特别是相互间距离很小的情况,如何采取有效措施控制隧道的变形,是值得摸索和研究的课题.在已经完工的上海东方路下立交过程中,依靠有针对性的设计和施工措施,使距其基坑底下3 m的地铁2号线隧道得到了很好的保护.通过对这些工程措施的总结和分析,并对比基坑开挖过程中的“横向”时空效应,将施工中采取的这些措施很大程度上归结为基坑开挖“纵向”时空效应的体现.实践证明,通过充分发挥基坑开挖时的“纵向”时空效应,能有效控制基坑的“纵向”的变形.同时,文章中总结的工程措施对以后的类似工程起到相当的指导作用.With the rapid development of urban construction, lots of constructions have being built closely. Especially, some excavations are just above the subway tunnel with almost no distance between the excavations and the subway. How to effectively control the deformation of tunnel and prevent the disaster induced by above excavation becomes a subject worthy of groping and researching. In this paper we studied the excavation of Dongfang Road underpass in Shanghai, which is just above the subway No. 2 tunnel and the nearest distance is only three meters. Depend on the effective designing and constructire measures we proposed, that the deformation of tunnel be controlled under its limitation and the tunnel was well protected. This paper summarizes these measures and concludes the most part to “vertical timespace effect” of the excavation. Also these valuable measures will benefit the following similar projects.

关 键 词：时空效应 基坑开挖 抗拔桩 堆载 

分 类 号：TU47[建筑科学—结构工程]