Deformation Control And Supporting Structure Analysis Of Deep Foundation Pit

With the continuous development of the city and the deepening of the modernization process,the development and utilization of underground space has entered a new development tide.The number of foundation pit projects is increasing and the scale is bigger and bigger.In the whole process of foundation pit excavation,to ensure the safety of foundation pit excavation,it is particularly important to control the deformation of the foundation pit itself and the displacement and deformation of the surrounding surface,buildings and underground pipe network in a safe range.As an important part of information construction,construction monitoring can grasp the displacement change of key parts and surrounding environment and the magnitude of supporting axial force in real time,ensure the whole foundation pit and surrounding environment in a safe and controllable state,enhance the safety of construction process,thereby reducing accidents.The numerical simulation of excavation process with FLAC 3D software can effectively control the deformation range and deformation trend of foundation pit,which is of great significance for guiding safe construction.The conclusions and conclusions obtained are as follows:This paper summarizes the types and characteristics of supporting structures commonly used today,summarizes several destabilizing failure forms of foundation pit,and obtains its destructive characteristics;studies the design principle of deep foundation pit support,and compares its applicability and practicability.Relying on the deep foundation pit project of General Yashu Station,a reasonable and feasible on-site monitoring scheme is worked out,and the main monitoring project types,monitoring point arrangement,monitoring instruments,monitoring frequency and feedback system are determined.The results show that the information construction method is adopted in the construction process,the real-time monitoring data analysis is carried out and fed back to the constructor and the designer in time,and some measures are taken in view of the excessive or abnormal deformation to ensure the safety control of the supporting structure and the whole process of the foundation pit itself and the surrounding environment.The deformation control has achieved good results.Based on the FLAC 3D finite element model of General Yashu Station of Hushi Metro Line 1,the stability of supporting system is analyzed.Surface displacement,supporting axial force and deep horizontal displacement of retaining structure in the simulated results are also analyzed.The supporting system can ensure the stability of the foundation pit in the whole process,and can ensure the deformation control of the key position,and can reliably guide the operation and construction.