Field Monitor And Numerical Simulation Analysis Of Foundation Pit In North Square Of Harbin Railway Station

Nowadays,with the development of planning and civil engineering in many metropolis,a large number of reconstruction and extension projects in China is in full swing,along with,the depth and scale of the foundation pit project has gradually increased,which makes the construction of underground structures,especially the design and construction of deep Foundation pit in the city facing more and more problems.Based on the research and analysis of the reconstruction and extension project of the underground supporting traffic junction in the North Square of Harbin railway station,the paper summarizes the deformation regularity of the foundation pit support system through the field monitoring data,and puts forward the prediction model of the surrounding building settlement.On this basis,the finite element method is used to establish a numerical model to compare and analyze the parameters that affect the performance of the supporting structure,and to put forward the optimization scheme to improve the application value of the support system in terms of performance and economy.The main contents and achievement of this paper are as follows(1)The construction of the reconstruction and extension project of the underground supporting traffic junction in the North Plaza of Harbin railway station is measured and compared with the current standard,and the safety stability of the foundation pit is evaluated.(2)The influence of the foundation pit pile anchor support stiffness on the foundation pit subsidence and horizontal displacement is analyzed.On this basis,the settlement displacement ratio and its fitting method of the surrounding building are put forward,and the experience formula of building safety prediction is put forward.(3)The influence of the stiffness of the pile body and the bolt and the angle of the anchor rod were analyzed by numerical simulation.Arrangement on the deformation and internal force of the deep Foundation pit supporting system during the division excavation is analyzed numerically.Based on the result of numerical simulation,the performance of pile-anchor support was optimized and it can provide valuable theoretical experience for the design of foundation pit engineering.