Study On The Deformation Law Of Deep Foundation Of Subway Station In Soft Soil Area In Nanjing

On the basis of foundation engineering design and project instance of construction management of The government of Liuhe District Station of Nanjing-Tianchang Inter-City Rail Transit in the north shore of the Yangtze River, Through the analysis and research on the design theory of deep foundation pit support, the parameters were determined, and through the analysis of the data measured during the excavation of deep foundation pit monitoring, to further explore the impact of the deep foundation deformation, the main conclusions are follows.(1) Applying design software, stress deformation has been analyzed and simulate for the station deep foundation pit in soft clay foundation,the force of Basic structure has been calculated, and the stability of basic structure was analyzed.And then selected the basic parameters of bracing structure of foundation pit, on the basis of the research of the monitoring in the process of Excavation at the scene, analysis Deformation law of the ground settlement around, the deformation law of the lateral displacement of diaphragm walling and the Change law of supporting axial force etc. Compare analysis the simulation results with the field monitoring data, finally the deformation law of foundation pit in soft soli area was obtained.(2) During the process of deep foundation pit excavation,the force and deformation of continuous concrete wall was similar to cantilever beam. Deformation of continuous concrete wall was similar to simply supported beam deformation. After the erection of support. It is a good method to control the deformation of deep foundation pit that installing the support in time and keeping the steel support prestress to a certain range.(3) The deep foundation pit precipitation and deep foundation pit excavation were the main cause of the settlement around the deep foundation pit the soil surface and it unevenly was changed, so if want to ensure the safety of the ground construction, we must optimize the precipitation plan to ensure the structure evenly change.(4) The construction of information technology is an effective means of deep foundation pit supporting technology smooth implementation, and through it the problems and the optimal engineering countermeasure can be used in the project.