Research purposes ： Qingdao Hualoushan Road Metro Station is in slightly weathered rock，on the both ends the composite rock bolting and shotcrete and suspending pile supporting modes open excavation method is used，on the middle section three - bench seven - step excavation method and blasting construction are used. Taking the station project as the background，the deformation law of main station and the surrounding environment was studied by in - situ monitoring test，the construction deformation characteristics of large span metro station in hard rock area were analyzed， the deformation rules were summarized，to provide the reference for the similar engineering construction.
Research conclusions ： ( 1 ) The surface settlement of composite rock bolting and shotcreting section is smaller than suspending pile supporting， the surface subsidence of initial excavation increases fast， and tends to be stable with excavation to floor position. The maximum settlement of the open excavation section is smaller than the subsurface excavation section. (2) In the same depth position，the anchor force of composite rock bolting and shotcrete section is smaller than suspending pile supporting section. Deep horizontal displacement of suspending pile was 11 inverted trapezoidal" distribution. (3) In the subsurface tunnel，vault settlement and convergence mainly occur in three stages， namely the excavation stage of the upper bench and on the left and right of the middle bench，and begin to slow and steady with excavation of lower bench. (4) The research results can be applied to the construction field of hard rock and large span metro station.
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