Excavation Construction Technology Of Deep Foundation Pit Of Subway

The supporting structure is often used as a temporary structure,without any effect after the completion of the construction.Some materials can be used in the construction of supporting structure,and the steel sheet pile and its supporting tool can be used again in support.But there are also some supporting structure permanently buried in the ground,such as reinforced concrete sheet pile,bored pile,cement soil mixing piles and underground continuous wall,etc..As the foundation of the foundation pit supporting structure,it is a part of the permanent structure when the construction is finished.In this study,based on the monitoring data of Changchun Metro Line 2,the reasonable structure model and calculation parameters are chosen,and the finite element analysis software is developed to simulate the deformation,earth pressure and surface settlement.Using the measured data to calculate the results,the modified soil model and the calculation parameters,and thus to determine the accurate analysis method,and then use the finite element analysis method to analyze the influence of the supporting rigidity,the supporting structure and the rigidity of the supporting structure on the stability of the foundation pit.The deformation control parameters of the retaining structure and the surrounding environment of the foundation pit of Changchun Metro Line 2 are summarized.The research results can be applied to guide the construction of the Changchun Metro Line 2.The information management of the construction process is realized by controlling the lateral deformation of the foundation pit supporting structure and the method of surface settlement.The research results also can be used as a theoretical basis for the standard and procedure of the deformation control of foundation pit engineering,the establishment of the Changchun Metro Line 2.The structure of this paper is the introduction,including the research background and significance,research status,research contents and methods,and the main work of this paper.In the second chapter,this paper expounds the construction technology,engineering geological conditions,engineering geological conditions,hydrogeological conditions,hydrogeological conditions,engineering design,engineering construction method,etc..Chapter three subway deep foundation pit safety calculation,mainly from the physical parameters of the soil,design parameters of anchor cable,design of prestressing steel support,assembly section excavation safety calculation and cast-in-situ segment pit safety calculation.The fourth chapter discusses subway deep foundation pit construction quality assurance,including construction quality assurance measures,the quality of pile concrete guarantee measures of quality assurance measures,purlin steel brace and steel,construction quality assurance measures.The fifth chapter discusses the construction of safety civilization.Sixth chapter conclusion and prospect.