The Research On The Deformation Of Soil Nailing In Deep Foundaton And Loess Region

With the rapid growth of Chinese economy, more and more tall buildings go up from the ground, the trend of buildings develop to the high altitude and underground become more apparent, so it is much important to support the deep foundation security and effectively. My thesis is based on a deep foundation of a tall building in loess area, designed its soil nailing, and used the theoretical analysis, field monitoring and numerical simulation methods to analyze the deformation. Main tasks are:(a)Analyzed the composition and structural form of the soil nailing wall, evaluated the engineering properties of its typical structural form.(b)According the engineering features, designed the support style of the deep foundation, and the results showed that soil nailing wall is a simple and effective way of deep foundation support.(c)Drew up a project monitoring program, and completed the on-site monitoring. In this thesis mainly analyzed the monitoring data of deformation in the soil nailing wall, given regular pattern of the deformation in the excavation of deep foundation. The results showed that the design of the support is reliable and monitoring programs is reasonable and feasible. The internal forces we monitored is small, it indicated the support structure design is conservatively.(d)Considering the actual excavation process of the tall building foundation, the finite element model is established, and the research of simulate the deformation structure of deep excavation is completed. The result showed that the deformation of the finite element calculated is consistent of the measured, the finite element modeling and calculation process is credible.