Abstract：
This project is consisted of three tower buildings and podium building. The foundation pit is about 21?000?m2 and is 1.5?km far from the Qiantang River. After analysis on geohydrologic conditions, waterproof curtain structure with a diameter of 850?mm and 1?m thick underground diaphragm wall were used for foundation pit enclosure. Considering complex engineering characteristics and difficulties, foundation pit dewatering was analyzed and water pumping and dewatering tests were carried out and some prevention and control measures for foundation pit excavation were adopted, to guarantee foundation pit safety and to provide reliable reference for construction design.
