Changchun Area Of A Deep Foundation Pit Collapse Accident Of Safety Influence Factors Analysis

With the rapid development of China’s city construction, city construction of super tall buildings, subway engineering, the corresponding number of deep foundation pit engineering is also more and more, deeper and deeper, the surrounding environment is becoming more and more complex, there have been many accidents resulting in deep foundation pit engineering construction process. Therefore, the cause of the accident of deep foundation pit is analyzed from the correct understanding of the factors affecting the safety, there are deep foundation pit construction process, and finally put forward the control of deep foundation pit engineering accidents relative and settlement plan, the possibility of the occurrence of safety accidents of deep foundation pit engineering construction can be reduced to the minimum.In this paper, the practical engineering of deep foundation pit of subway station based on Changchun City as the background, using the finite difference software FLAC3 D, the establishment of a suitable model, main content of research:(1) on the foundation pit with three different excavation conditions are stratified excavation, based on the comparative analysis of the surrounding ground settlement calculation and FLAC3 D simulation results of the three cases of overbreak excavation of underground continuous wall in the process of each layer and the three excavation of foundation pit excavation conditions, summed up the influence of foundation pit a security guard structure.(2) on the foundation pit with seven different kinds of variable load conditions around the foundation pit, and the pit excavation, calculated on the basis of the simulation results of FLAC3 D were compared with deformation of underground continuous wall of the analysis, summed up the influence of variable load around the foundation pit supporting structure of the safety guard.