Some parameters in the design of multipropped deep foundation pit are analyzed; and the selection of flexibility parameters of prop and retaining wall is compared. Using FEM

an orthogonal design test of the excavation of deep foundation pit is carried out considering 4 levels of the prop stiffness

displacement flexibility number; elasticity modulus and so on

and the influences of these parameters on the excavation deformation are obtained. It is concluded that the displacement flexibility number of retaining wall is primary parameter which controls the deformation of foundation pit; other parameters

such as stiffness of soil

etc.

have little influence on deformation of deep excavation.