KEY TECHNOLOGIES OF DEEP BURIED SUBWAY STATION WITH PLATFORM SEPARATED FROM HALL IN LOESS STRATA
The process conversion of deep buried subway station with platform separated from hall frequently chang-es and the system of deformation and the stress state is complex.In order to clarify the key technologies of deep bur-ied subway station with platform separated from hall under complex environmental conditions,the interval from a cer-tain city metro line 15#is introduced.Key technologies of new-added SZⅡstation,such as vertical shaft and cross passage,mined main-tunnel,open-cut hall,and inclined passage of staircase are analyzed.Meanwhile,a 3D numer-ical analysis is carried out and the displacement characteristics of platform structure under different construction steps are analyzed.Some conclusions have been drawn.Firstly,it is suitable to construction a platform-hall separat-ed station with open excavation method combined with concealed excavation method.And the construction risks and engineering costs are reduced.Secondly,the construction process is multiple and the conversion is complex.And the interface positions of different structures are the key to construction control.Finally,the hall construction has a sig-nificant impact on the displacement distribution of the platform structure,and the construction of inclined passages has a local impact on the platform.
loess strataplatform separated from hallopen-cut method combined with concealed methoddesign and construction3D numerical analysis
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