Research purposes：Through making the site survey , investigation , theoretic analysis and computer simulation, the researches are made on the excavation program and stability analysis of deep foundation pit for underground pump house Wangtan Power Station for the purposes of adopting the most economic and reasonable construction program and method based on the premise of guaranteeing the safety and stability of foundation pit and satisfying the requirement of construction schedule.
Research methods： The discussion and comparison are made for the excavation programs and methods of deep foundation pit for underground pump house of Wangtan Power Station from the areas of technology, construction and economy., and the simulation computing and analyses are also made for the processes of different excavation methods with computer technology.
Research conclusions：The theory and engineering practices show not only the construction quality can be guaranteed , but also the requirement of construction schedule can be satisfied by adopting the program of combining the method of excavation on half slope from 3. 5 m of ground elevation to-9 m underground with the method of underground continuous wall from -9m to -13. 5 m. In this way, the foundation is stable, construction is easy and the good economic benefits can be obtained.
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