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Abstract Taking swirl pool deep pit，PU steel relocated project，Baoshan Iron and Steel Co.，Ltd.，as an example，the complex more flow of confined aquifer conditions is made clear through pumping test in field，and reasonable conception model is established. The design of deep pit dewatering with pumps inside and outside of pit is completed based on the conception model. The pumping test of well group verifies the reasonability of design，and the dewatering course indicates that the more flow conception model is reasonable，and the pit is dry during construction through the combined function of well group inside and outside of pit，which meets the control standard. In pumping test by opening two wells and resting one well，leakage of concrete wall is predicated and emergency measure is prepared. When the leakage of concrete wall emerged，reasonable measures were adopted in time and serious accident was avoided. The research results can provide a reference to similar project.
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Received: 26 November 2008
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