Impact Analysis Excavation Of Deep Foundation Pit Excavation On Adjacent Metro Tunnel

With the development of economy and urbanization in China,a large number of deep excavation are blooming,even lots of ultra high-rise buildings located in business and financial center of mature city.It is a higher standard for selecting a support method with complicated surrounding,limited space and prohibition of open cut excavation,compared to originally single form.In deep excavation project,it is add to lots of extra difficulty for support and operation,to keep existing buildings,its quality,safety and schedule.Existing buildings,due to security risks of groundwater and lateral earth pressure,have a great influence on practical operability.Choosing a reasonable,scientific and available support method is precondition to ensure safety and quality of deep excavation,and local choice about support method is one of the most important topics for deep excavation.lt is based on wide collection of literature,to analyze the existing problems,research significance,research status at home and abroad and the development tendency of the support method,which combine the extension project of Shenzhen DAS-Tower that is near Subway Line 1 and has existing buildings,according to geological condition,surroundings and excavation design.The main works are as follows:Introducing the common support methods,features and application of deep excavation;According to engineering geological condition and local condition to analyze the support method of DAS-Tower and integrated data of excavation by reasonability,feasibility,and technicality;MIDAS,finite difference software,is used to three-dimensional simulation of excavation near Subway Line 1,and research mechanical properties and deformation laws of excavation for comparation of actual data.