Similarity law of centrifuge test was developed for seepage field and stress field of foundation pit with confined water by analyzing control equations,and similarity index & similarity coefficient of centrifuge test were obtained.

In the designing of foundation pit dewatering of disturbed group wells,to check the drawdown of water level is a key step whether reach the requirement of design or not,it relates to the rationality of the arrangement and the quantity of dewatering well and affects whether the dewatering of foundation pit will succeed or not.

Using groundwater recharge system,it can reduce the influence on surrounding environment induced by dewatering of foundation pit in the project.

In order to guarantee safety of fund ation pit construction and nearby building,a nd to prevent ground subside caused b y dewatering of foundation pit,in th e construction.

Several noticeable problems and solutions in the foundation pit dewatering;

The influences of the foundation pit dewatering of pump station of Niangzi Pass on Wulong spring and Shibanmo spring;

By the calculation of influence of foundation pit dewatering and support structure deformation on the adjacent existing building,water-sealed curtain and recharge technology are not adopted which satisfies the settlement of the adjacent existing building in the permission scope,guarantees the use security of the adjacent existing building,reduces the construction difficulty,saves the massive fund.