| Deep foundation pit engineering is one of current hot and difficult problem in the field of geotechnical engineering.How to effectively control deformation of foundation pit and make foundation pit engineering safe and economical,is that people have been exploring topic.Deformation of deep foundation pit supporting structure is the important factors influencing foundation pit deformation.After reading a large number of related literature at home and abroad on the basis of summarizing research achievements,grew up in a house road(east new east road,stone bridge road)road engineering deep foundation pit project as the background,aiming at characteristics of deformation of retaining structure in excavation process are studied,and the finite element software MIDAS/GTS large to practical engineering in the process of step-by-step excavation displacement and internal force distribution are analyzed,emphatically discusses the deformation of supporting structure and its influencing factors,some mechanism of deformation of foundation pit retaining structure are obtained.In this paper,the main work and conclusions are as follows:(1)grew up in a house road(east new east road,stone bridge road)road engineering is based on deep foundation pit project,adopt the method of combining theoretical analysis and field monitoring,the mechanism of deformation of deep excavation of the tunnel are analyzed,based on the analysis of monitoring data,the deformation of the retaining piles in deep foundation pit retaining structure,and on this basis according to the data measured deformation of retaining pile reinforcement of retaining piles for optimization design research.(2)the three dimensional numerical model was established based on Midas/GTS software,the simulation of excavation process,USES the analysis software of retaining pile internal force and displacement in the process of construction,steel support axial force are numerically simulated,the simulation results and field monitoring results are basically identical.By establishing a three-dimensional numerical model,the paper analyzes the factors that influence the stability of foundation pit of for construction monitoring in the process of data analysis and early warning and provides the technical support.(3)using Midas/GTS software three-dimensional numerical analysis model is established,the foundation pit construction whole process dynamic simulation.Calculation results accord with basic engineering monitoring data,through theoretical analysis and numerical simulation,obtained the excavation process of the key factors influencing the running rail deformation.Calculation results show that the excavation will inevitably cause displacement,bottom soil displacement drive the railway track,discussed to reduce the influence of excavation on adjacent to railway control measures. |
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