Influence Of Foundation Pit Excavation On Surrounding Environment Of Gongga Airport Reconstruction And Expansion Project

In this thesis,the deep foundation pit excavation project of Gongga Airport reconstruction and expansion project as an example,summarizes and analyzes the field measured data based on the previous relevant theoretical experience,and then uses ABAQUS finite element simulation software to simulate the excavation process of the foundation pit,and compares the simulation results with the actual measurement data of the project,and analyzes the foundation pit retaining structure during the construction process.The deformation of the structure and the settlement of the surrounding ground prove the reliability of the model using the finite element analysis software to simulate the excavation process of the foundation pit.In this thesis,summarizes the laws of settlement and deformation of surrounding soil mass,expounds the impact of deep foundation pit excavation on the surrounding environment,grasps the impact of such engineering excavation on the surrounding environment and the law of surface settlement,and ensures the safety of construction and operation of deep foundation pit excavation engineering.The work and achievements of this paper are as follows:(1)Reading and summarizing the relevant literature about the impact of excavation process on the surrounding environment at home and abroad,to provide theoretical basis for the study of this topic.(2)A series of deformation characteristics caused by excavation of foundation pit are analyzed and summarized.At present,the deformation of foundation pit mainly includes settlement of surrounding surface soil,displacement of retaining structure,uplift of foundation pit base,etc.the deformation mechanism and deformation theoretical calculation of these foundation pits are analyzed and summarized.(3)According to the field monitoring plan formulated according to the actual engineering situation,the uniform monitoring points shall be arranged around the foundation pit to monitor the whole construction process of the foundation pit excavation,obtain the deformation data and surface settlement data of the foundation pit retaining structure,draw the displacement change curve of the foundation pit during the excavation process,conduct monitoring analysis and processing,and obtain the basic law of the surface settlement around the foundation pit excavation.(4)The ABAQUS finite element analysis software is used to simulate the excavation process of foundation pit and study the influence of excavation on the surrounding environment.The simulation results are sorted out and compared with the actual test values.The simulation results of different external conditions are obtained by changing the depth of the concrete wall into the soil and the load value of the upper part.The results are analyzed and summarized and the foundation pit is opened The settlement law of excavation to buildings.