Research On Pit Support Technology Of Wangsheren Station In Jinan Subway R3 Line

With the rapid development of national economy and the accelerated process of urbanization in China,the rapid increase of urban population,urban traffic pressure is increasing,the development of urban underground space and development of underground rail transit have become a trend.The subway station lines are mostly distributed in the area of urban dense buildings,which puts forward more stringent requirements for the stability of the foundation pit of the subway station.The foundation pit support technology of Wangsheren station is studied according to the first stage project of line R3 of Jinan rail transit in this paper.Firstly,it systematically investigates the relevant literature at home and abroad,reviews the current research and development situation at home and abroad,and systematically summarizes and arranges the current mainstream foundation pit supporting technology.The meteorological,geotechnical engineering and hydrogeological conditions of Wangsheiren station are analyzed.Then,according to the geological conditions of the site,the paper puts forward the foundation pit retaining technology,internal support technology,groundwater dewatering technical scheme,construction technology and foundation pit stabilization measures.This paper analyzes in detail the technical scheme of foundation pit enclosure design of Wangsheren station,and puts forward that the main links of foundation pit support include bored pile,rotary jet pile construction,crown beam and concrete support,shotcrete between piles,inner support,excavation of station foundation pit,backfill construction technology and foundation pit groundwater dewatering technology.Finally,by monitoring the displacement,internal force and settlement of foundation pit,ground settlement and groundwater level,the curves of horizontal displacement of retaining pile and axial force of steel bracing with time and working condition are analyzed,and the dynamic changes of foundation pit deformation,bracing internal force and groundwater level are analyzed,and the effectiveness of the techniques used in the foundation pit support scheme is verified.