Analysis On Structure Internal Force Of Dongmen Bridge Station Of Chengdu Metro Line Two

Metro stations are often built in prosperous cities,with dense buildings and complicated underground pipelines.The ground settlement and ground traffic have more strict requirements in the city.Therefore,in order to guarantee the pit safety and reduce the influence of the surrounding buildings,it is necessary to study the internal force and deformation of strutted structure for excavation.What's more,it is also necessary to study the internal force and deformation of station structure for the safety of station and reducing the ground subsidence.Aiming at strutted structure of Dongmen bridge station,the internal force and deformation of the structure were calculated,and the difficulties in actual construction were analyzed.Then,the station structure was studied by plane analysis method and three dimensional analysis method.Relevant conclusions and suggest can provide valuable reference to the design of station structure.Firstly,Through research of common construction method building subway station,such as open-cut method,cover-digging and tunneling method,etc.,we can know their features and applicable conditions.And common foundation pit support structures were introduced.Dongmen bridge station is regarded as the research object in this paper.Several retaining structures for station were discussed,and the specific type of retaining structure was confirmed.Secondary,the internal force and deformation of the strutted structure of Dongmen bridge station were analyzed for the safety of structure.In the actual construction,the shield machine is needed to lift in the roof structure.In order to reduce the construction waste of the roof,the layout of column position in the design and increasing the interim measure method,were put forward.In this way,it is no need to the increase of thickness and reinforcement to ensure the safety of smooth lifting.In the practice,the maximum deformation of shield machine in the process of lifting structure plate is 5 mm.It means that proof structure is safe within the reasonable scope of structure deformation.Finally,station structure were studied by plane analysis method and three dimensional analysis method.The internal force and deformation of floor slabs,beams and columns were analyzed,providing valuable reference to the design of station structure.The calculation results of two methods were compared.And results show that the internal force of floor slabs,beams and columns by plane analysis method is larger.Hence,the plane analysis method in practical design is safe and reliable.