基坑降水技术在南水北调工程中的应用

南水北调中线贾鲁河倒虹吸工程进口渐变段、管身段、出口渐变段地下水位高于基底,存在基坑涌水问题。基坑降水采用管井降水方案。通过单孔降水试验得到管身段基础的渗透系数为33.16 m/d,据此确定贾鲁河倒虹吸管身段降水方案:贾鲁河左、右岸各布置9眼降水井,上下游围堰各布置2眼降水井,共布置22眼降水井。

Application of Foundation Pit Dewatering Technology to the South North Water Transfer Project

In the inlet transition,pipeline,outlet transition of Jialu River inverted siphon engineering,the ground water level was above the basal which caused the drainage problem of foundation pit.Foundation pit dewatering adopted well tube precipitation project.Through the experiment of single-hole precipitation the permeability coefficient was 33.16 m/d.So that the precipitation scheme of Jialu River inverted siphon pipeline could be confirmed,i.e.9 precipitation wells were placed on the both banks of Jialu River and 2 wells in each cofferdam on the upper reaches and lower reaches,totaling 22 wells.