Research On Key Technology And Deformation Monitoring Of Deep Foundation Pit Construction Of A Project

Deep foundation pit engineering is a integrated technology in which many disciplines are intertwined.In the design and on-site construction,management personnel,machines,materials and other changes will have a profound impact on the construction.With the continuous increase of the number of high-rise building foundation pit engineering and the limitation of surrounding environment of foundation pit engineering,the selection of construction scheme and construction technology can effectively carry out foundation pit support construction,and should use certain evaluation methods to carry out risk assessment of foundation pit construction process.Through the investigation and analysis of the influencing factors and causes of the safety accidents of the foundation pit,the deformation characteristics of the deep foundation pit,the safety risk management object and the safety risk assessment method are studied,and the steps and processes of the safety risk management of the deep foundation pit engineering are established.Secondly,the research object selected in this paper is the deep foundation pit construction project of Shibo Avenue.After fully analyzing the key and difficult points of the construction,the key construction techniques of the deep foundation pit involved in the construction process are specifically analyzed,including the dewatering construction technique,water supply and drainage construction technology,etc.,the layout,equipment and early warning monitoring of deep foundation pit deformation safety monitoring applied in the construction process are analyzed.Finally,combined with the potential risks in the construction of the deep foundation pit of the Expo Avenue,the fault tree model of the supporting structure of the deep foundation pit is established based on the risk assessment theory of the fault tree of the deep foundation pit.The accident tree of the construction of the deep foundation pit of the Expo Avenue is compiled.Through safety risk assessment of the project,the wind is obtained The risk assessment results are in the medium risk level,and the level is 3,which is acceptable after treatment.For general injury accidents,it needs to be rectified before implementation.On this basis,the early prevention,process control and safety prevention measures of foundation pit engineering safety risk are put forward.Through theoretical analysis and on-site construction practice,all parties involved in the construction of deep foundation pit can objectively and truly grasp the project quality and key indicators of each part of the project,which is of great significance to the safety of foundation pit structure and adjacent environment.