Analysis On The Change Of Frame Node By Forced Top-down Construction Method

Foundation pit supporting is an important part of the deep foundation pit engineering.In recent years,the foundation pit supporting has been rapid development,all kinds of to adapt to the actual situation and requirements of the new foundation pit supporting technology.And uni-axial dense cities in building foundation pit has been more and more widely used in engineering,and its principle is simple and obvious economic and social benefits.Therefore,Researching for the construction technology of deep foundation pit uni-axial and structure analysis system,it is important of theoretical significance and practical application value for the development of foundation pit engineering.Taking guizhou DouJun mastery in gloria plaza hotel foundation pit engineering as the background,after the retaining piles have been done,supporting plan change caused by the scene actual situation,was forced to change the original pile anchor support scheme to use uni-axial,for subsequent engineering construction.Due to structural changes in the uni-axial,lead to drive by the original position to move to the most close to the edges of the main structure of the supporting pile,the load transfer to the main structure of the original uni-axial become extremely adverse,under this background,the research and analysis of article are as follows.(1)describes the characteristics of the uni-axial in excavation engineering,through the analysis of research status at home and abroad,indicated that the support in the form of a safe and reliable,affordable,and good application prospect.(2)the analysis of field monitoring data are focused on the field monitoring of supporting pile bending moment and the strength of pile body changes due to plan changed,we use the principle is the foundation pit design software of the original pile anchor support scheme were analyzed,and compared with field monitoring and analyzing the deformation of pile body.(3)the elastic-plastic finite element analysis method is adopted to frame nodes before and after the change of the ground settlement around the value,the internal force and deformation of the retaining piles,change the location of the frame structure of the internal force and deformation are analyzed in numerical simulation and the overall.(4)in view of the inverse approach node position in the process of change,explore node stiffness influence the performance of the framework,and put forward the framework of the pillar strength and stiffness of reinforcement scheme.