Influence And Control Of External Load And Excavation Method Of Deep Foundation Pit On The Deformation Of Retaining Structure

With the development of urban construction,utilization of underground space become important,and deep foundation pit engineering increased.The deeper of deep foundation pit excavation,the higher risk of the engineering structure and the surrounding environment is.In recent years,the accident and dangerous occurrence happened in domestic construction of deep foundation pitleads to bad influence on the safety and surrounding environment.t The safety of foundation pit construction is particularly important,and the horizontal displacement of the retaining structure is an important index to control and judge the safety of foundation pit.The thesis mainly concentrate on the foundation pit deformation of Tianjin Metro Line 1which east extend to the Exhibition Center project in Section 4 of subway deep foundation pit engineering.By the use of engineering monitoring means,the deformation data of different pit excavation stages acquired.We also make an analysis of the influence of various construction links on the deformation of foundation pit,so as to take effective measures to deal with it.The analysis results show that the excavation sequence,the supporting installation,the foundation pit and the surrounding load of foundation pit are all the factors which affect the deformation of foundation pit.