南水北调穿漳工程基坑降排水

南水北调穿漳工程主体为穿越漳河河床的倒虹吸,地基为砂卵石层,渗透系数非常大,工期紧,降排水施工难度大.根据现场实验,确定了帷幕灌浆与井点降水结合明排的降排水方法.先期进行帷幕灌浆施工,阻止基坑外的水进入基坑;然后采取井点降水结合明排的方法,降低并控制地下水水位;保证了基坑混凝土干地施工,同时保证了工期,节约了资金.

Foundation Pit Drainage in the Construction of Zhanghe River Crossing Project of South-to-North Water Diversion

The main part of Zhanghe River Crossing Project in South-to-North Water Diversion is the inverted siphon which passing through the riverbed.As the very high permeability coefficient of the sand and gravel river foundation and short construction period,the dewatering and drainage of foundation pit is difficult.According to field experiments,the methods for water lowering and drainage in foundation pit are proposed.Curtain grouting is conducted in advance to prevent water penetrating into the pit;and then tak...