Upon rock-soil combinational geological condition in Qingdao

a summary is made to know the main supporting type for deep foundation pit in the area; and draw the conclusion that“ piled anchor in soil and anchor bolt shotcrete in rock” are in common use in such deep foundation pit. Taking two typical deep foundation pits of Licun station in Qingdao metro for examples

finite element method is used to do simulation calculation of the station foundation pits; and it is surely proved that pile-anchor and braced structures are well used in the area

especially in controlling horizontal deformation

the pile internal force and surrounding settlement. The work will greatly help the latter metro design in Qingdao metro construction and provide many ideas for the construction in similar geological conditions.