福州机场航站楼基坑降水设计

Drawdown Design of Foundation Pit for Fuzhou Airport′s Aviation Building

对滨海风积沙平原,在富水的厚层细砂含水岩组水文地质条件下的大面积基坑降水工程,没有同类经验可以借鉴,可选择的方法有大井法、管井法、点井法(真空点井、喷射点井、电渗点井)、辐射井法、明排井(坑)法,一般要进行多个方案的比较。本文通过工程实例,在抽水试验的基础上,提出采用管井封闭降水方法,解决了大面积基坑降水的难题。

For the coastal drift-sand plain, it is the first time in Fujian province and also seldom in China that the large area foundation pit drawdown has been conduced in the hydrogeologic condition of hydrous thick-bedded fine sand water-bearing aquifer. There are some other methods such as large well, pipe well, point well,radiation well and so on. In general, such method needs some comparisons. On the base of pumping tests, the method of pipe well latch-up drawdown, which solves the problem that large area foundation pit drawdown project, is suggested to be used in these areas.