Analysis of Dewatering Technology for Large Foundation Pit of Xi′an North Railway Station

Research purposes:The construction the Xi'an North Station was divided into the northern and southern areas and the dewatering engineering was also divided into northern and southern areas.The dewatering engineering was conducted twice separately to these two areas and the second dewatering engineering was conducted in about half year later of the first dewatering engineering.As the area of the foundation pit was large and the buried depth of the foundation was different,the dewatering was conducted in two phases according to the engineering conditions of the engineering site.The analysis and research were done on the dewatering process to know the influence of dewatering. Research conclusions:The research showed in order to make the dewatering reasonable and effective,the following works must be done well:((1) The geological and hydrological conditions had to be well known before the dewatering engineering began.(2) The dewatering well had to be laid out reasonably in order to give the full play to the dewatering well.(3) The dewatering checking had to be precise.(4) The engineering organization had to be scientific.(5) The engineering management had to be strict.(6) The dewatering monitoring had to be accurate to avoid the appearance of the unexpected accidents.