Dewatering Design and Calculation of Attached Structure of Subway Deep Foundation Pit
Groundwater control plays an important role in the process of subway construction.In order to discuss the design of confined water level dropping of the first terrace of the Yangtze River and the influence of the surrounding environment,the calculation principle of confined water incomplete well and the calculation method of foundation settlement theory are adopted to carry out the precipitation design of the attached structure of deep foundation pit and evaluate the foundation settlement caused by the groundwater level drop-ping.The research shows that:The number of dewatering wells and dewatering structure calculated on the first-level terrace of the Yangtze River based on the confined water theory meet the requirements of engineering construction.The dewatering of 1.5 d can meet the field operation conditions.The formation settlement caused by 8 m of groundwater level meets the control value of<40 mm of foun-dation pit,but it is much higher than the formation settlement caused by 6 m.Therefore,in the actual project,it is necessary to open the corresponding number of precipitation wells accurately,and it is not appropriate to dewatering a large area,and it is appropriate to draw down a small depth,and should be paid attention to the formation settlement monitoring after dewatering.
deep foundation pitdewatering designfoundation settlement
NETL
NSTL
万方数据
