Study On The Support And Monitoring Of Deep Foundation Pit In Changning Avenue Station

Today,as one of the important means of transportation for people to travel,the subway plays an important role in urban traffic.The process of urbanization and the accelerated development of urban construction in China require the speed of urban subway construction.No doubt twenty-first Century will be the era of rapid development of China’s subway.In the next 20 years or more,it will be the peak period for the development of subway.2009 08 month 07,Hefei Metro Line 1 experimental project opened a new chapter in the construction of the Hefei subway,Hefei plans to form 13 subway and run in 10 years.The foundation of subway station is deep foundation pit engineering.Its stability and safety is one of the important problems faced by subway stations.Research on it has certain theoretical significance and engineering application value.The paper takes the construction of Changning Avenue station of line four of Hefei subway track as the background.In view of the actual situation of the deep foundation pit of the subway station,including the hydrogeological conditions,the surrounding site conditions and the design requirements,the selection of support for the foundation pit is selected from the many deep foundation pit supporting methods,and the selection of various support methods is selected.The applicable conditions in different circumstances are discussed.Finally,the bored pile and internal supporting system are selected.In this paper,the construction process of bored pile and the construction process of internal support support are studied.From the practical point of view,the construction deployment,preparation and foundation pit excavation of deep foundation pit are expounded.A practical monitoring scheme for deep foundation pit is designed,and the key monitoring items,monitoring instruments,monitoring points layout,monitoring frequency and the monitoring data are analyzed and processed in time,so as to provide guidance and reference for the construction.The emphasis is on the monitoring of the horizontal displacement and settlement of the crown beam,the monitoring of the axial force of the steel support and the concrete support,and the monitoring of the surrounding ground settlement,according to the deformation monitoring technology and the precision conditions of the deep foundation pit.Based on the analysis of monitoring data,the change rules of foundation pit deformation during construction are summarized,and timely feedback information is applied to information construction.