Comprehensive application technology of multiple support and water proof methods in foundation pit

The remarkable characteristics of the foundation pit project of Wuhan International Conference and Exhibition Center are its large plane sizes, superdepth and complicated surroundings. The design and construction of the foundation pit support followed principles of feasible technology, reliable safety, economic and reasonable cost in consideration of short construction period and great importance of the project. According to different actual conditions of supported sections, bored concrete piles and anchorage bars, shotcrete and anchorage bars, walls with bar nails driven into soil were used for the support and protection of the foundation pit, and cement-soil pile sheets formed by cement injection and mixing, cement pile sheets formed by high-pressure rotary injection of cement grout were used for the water prevention of the foundation pit, satisfying the requirements of the foundation construction, creating safe surroundings and also saving project cost. The foundation pit’s support system and water prevention custain system are presented in this paper.