Research And Application Of Construction Technology Of Foundation Pit Under Complicated Geological Conditions

In recent years,with the rapid development of the economy of our country,further accelerate the pace of urban construction,and the rapid development of urban scale and construction land tense conflicts become more and more fierce,so the development of underground space,increase the building I basement floors become important means in engineering construction.With the increase of the construction of foundation pit excavation depth,a large amount of dewatering of foundation pit,soil supporting poor stability characteristics gradually,prompted the engineering and technical personnel research and exploration on the theory of deep foundation pit engineering.The Kai Luan GCL Power Company Limited(2x300MW)unit project as an example,the deep foundation pit engineering theory and construction technology research,in order to ensure the construction quality and schedule requirements,the construction assurance measures are explored This paper introduces hierarchical cross digging method to speed up the construction progress,from the end to cross layered excavation dig to design elevation of each layer are provided with separate road transport and temporary drainage facilities,suitable for deep excavation and short;in the various methods of supporting the rational matching to ensure that in a different medium range.Excavation depth of pit,environment and geological conditions of super deep foundation pit support retaining structure selection,different engineering foundation pit supporting and permanent works structure to co-ordinate matching synchronous design,and realize the maximization of whole life cycle benefits.Through the study of deep foundation pit engineering design and construction under complex geological conditions,and the analysis of related safeguard measures,it provides reference for similar projects,and it is of great significance to establish the theory of deep foundation pit engineering.