Analysis Of Mechanical Mechanism For Deep Foundation's Excavation And Support Of The Metro Station Based On The Spatial Effect

This paper, which take the administrative center of Kunming subway station, Metro Line1deep foundation engineering as researched background, summed up the law of deformation of the retaining structure and the space distribution of the axial force by a pooled analysis of on-site monitoring data. By using the Midas/GTS finite element simulation to a standard segment of the pit numerical analysis and contrasting the calculated horizontal displacement values of wall to measured values, it shows that the calculation model is reasonable.Based on the model validation, we study spatial effect on the subway station deep foundation excavation and support, including analysis of deformation and internal force on supporting after digging and digging after supporting, slotted and not-slotted in the soil excavation, the arrangement of support position and the timing of support-erection. The results show obvious spatial effect during excavation. Using spatial effect reasonably can effectively reduce the deformation of the retaining structure and the impact on the surrounding environment.It is also discussed the different effects on pit deformation and the surrounding ground when the parameters of the retaining structure and support system change. Finally, the paper pointed out that steel support which have been imposed pre-axial force can effectively control the pit deformation and have a clear advantage on protecting the environment, saving the cost and shortening the construction period.