基坑施工时下方近距离隧道保护

随着城市建设的高速发展,出现了不少施工项目。在间距很小的情况下,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工程施工过程中,依靠有针对性的设计和施工措施,使距其基坑底下3m的地铁2号线隧道得到了很好的保护。文章总结了这些工程措施,并将大部分归为基坑开挖“竖向”时空效应的体现。

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

With the rapid development of urban construction, lots of constructions have being built closely. Specially , it has appeared some excavations just above the subway tunnel in Shanghai city, sometimes these is almost no distance between the excavation 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 constructing measures we proposed, the deformation of tunnel is controlled under its limitation and the tunnel was well protected. This paper summarizes these measures and con(?)ludes the most part to " vertical time - space effect" of the excavation. Also these valuable measures will benefit the following similar projects.