Research On The Stability Of Pile-anchor Retaining Structure Of Metro Station Deep Foundation

With sustained and rapid application development of urbanization process,the demand for underground space increase.Especially the past 20 years.The quantity of deep foundation pit engineering has a rapid increase,and a series of characteristics are shown,including deep excavation,irregular geometry and so on.There higher requirements for the safety,economy,practicality and environmental protection of deep foundation pit engineering are put forward.Therefore,feasible retaining structure is necessary for reducing the losses brought by engineering accidents,which takes the deformation of retaining structure and the impact of surrounding environment into account.To solve the problem,Sports Park station of Changsha rail transit is chosen as the research object in this paper.The design of pile-anchor retaining structure of deep foundation pit engineering was preformed,combing static structural calculation and dynamic numerical simulation.Firstly,based on the on the geologic information of site and the characteristics of different retaining structures,pile-anchor retaining structure is taken.The design and demonstration of pile-anchor retaining structure was carried out utlizing Beijing Lizheng software.Then,the finite difference software is used to calculate the distribution of deformation the stress of deep foundation pit engineering under the condition of luid solid coupling.In the meanwhile,the overall stability of deep foundation pit is analyzed.Finally,the data from the static structure calculation,the numerical simulation and the field monitoring are compared.The results show that the accuracy the results of the static structure calculation and the numerical simulation analysis are exact,the designed scheme and the selected parameters could meet the stability requirements.The combination of both static structure calculation and numerical simulation is equal to applied static and dynamic concept to deep foundation pit-anchor retaining structure design concurrently,which could play an important role in optimizing the design and maintaining the stability of deep foundation pit engineering.