Analysis Of Supporting Deformation Behavior Of A Deep Foundation Pit

With continuous booming national infrastructure,construction of underground engineering in China increases continuously,and the underground construction projects usually take deep foundation pit excavation,has a strong regional and individual differences,its supporting structure in different engineering geological condition,structure form,supporting force characteristic under the style is not the same,so for deep foundation pit excavation of a certain engineering methods such as actual monitoring and numerical simulation are adopted to study deformation law supporting system is necessary.Combined with the deep foundation pit project in riverside Business District of Hankou,this paper selects the methods of field practical monitoring and numerical simulation analysis to observe and analyze the deformation of the supporting system of deep foundation pit and the surrounding surface settlement,and then evaluates the stability of the supporting structure of the foundation pit.This paper summarizes the advantages and disadvantages of concrete inner support and steel support respectively,and compares them,so as to obtain the optimal support system under different soil quality,different depth and considering cost.Combined with the monitoring implementation plan proposed in this project,the displacement and internal supporting force of the support system of underground structure and settlement of surrounding surface buildings were tracked and tested.Based on the statistical analysis of construction monitoring data,the displacement and internal supporting force of the foundation pit support system and settlement law of surrounding surface structures were studied in the process of excavation.The monitoring results show that the horizontal displacement of the support system is small during the construction period of the underground project,and the foundation pit is in a safe and stable state.In this paper,numerical calculation model is established based on the design of foundation pit supporting,supporting structure deformation and stress of numerical calculation,the calculation results show that reasonable support stress controlled,comparing the results of numerical calculation and monitoring,accord well with those of the evolutionary trend,as well as the displacement deformation of the retaining structure supporting pile is roughly same,so as to verify the reliability of the actual monitoring data.The results of field monitoring and numerical calculation show that the deformation of foundation pit retaining structure is in a controllable range,the deformation rate is small,and the whole foundation pit is in a stable state.This paper studies and analyzes the deformation law of filling pile of retaining structure under different pile diameters on foundation pit settlement,changes the parameter of supporting pile diameter,and comes to the conclusion that increasing the diameter of pouring pile has great influence on foundation pit supporting system.Finally,some Suggestions and Suggestions are given for the prevention of construction accidents of similar underground structures.