九华山隧道玄武湖段降水施工技术

根据九华山隧道玄武湖段的实际水文地质情况,在长大深基坑土方开挖前,选用管井与轻型井点相结合的复合式降水方案,主要采用管井降水,对管井降水不能满足土方及时开挖要求和止水帷幕失效部位采用轻型井点辅助降水,整体降水效果良好,满足土方开挖前的降水要求。

A Study on Construction Technology of Decline the Water for Jiuhuashan Tunnel in Xuanwu Lake

Based on the actual hydrologic and geologic situation for Jiuhuashan Tunnel in Xuanwu Lake,before the long,wide and deep foundation pit would be dug,used the compound scheme of water lowering of tube well-point integrated with light well-point,fixed on the depth of pipe buried and the pitch of mid-pipe by calculating,disposed well-point dewatering combined with conditions surrounding,the main use of tube well-point precipitation,which could not fit in the demands of the earthwork and counterchecking water curtain stoppage parts used light well-point auxiliary precipitation,a good effectiveness was achieved so that the building construction of earthwork run very well.