Analysis Of The Influence Of High Rise Building Construction On Adjacent Tunnel

In twenty-first Century,with the rapid development of China's economy,a large number of people swarm into the city,causing traffic congestion in the city.In order to alleviate the urban traffic congestion,the state vigorously promotes the construction of urban tunnels.With the operation of the city tunnel,a large number of new buildings will be built around the tunnel.The new building will inevitably cause deformation of the tunnel in the construction process.If the deformation is excessive,it will endanger the structural safety and normal operation of the tunnel.Therefore,it is necessary to analyze the influence of new construction on adjacent existing tunnel.Combined with MIDAS/GTS simulation software,this paper treats a new construction project in Qingdao as the engineering background,analyzes the influence of the construction stage and the main structure of the new high-rise building on the adjacent tunnel and obtains the relevant laws of tunnel deformation.The following is the main research content of this paper.(1)The research status at home and abroad is summarized.Based on additional stress of foundation,the paper uses the Mindlin method to calculate the additional stress caused by the building load on the longitudinal and transverse direction of the tunnel.The horizontal displacement and vertical settlement of the tunnel are theoretically analyzed by using the Winkler foundation model.(2)A three-dimensional finite element model is established based on a specific engineering example in Qingdao area.Considering the deformation of the tunnel during the calculation of the model,this paper analyzes the influence of the excavation unloading on the tunnel.On this basis,the numerical results during the excavation process are compared with the actual monitoring results,and the rationality and correctness of the finite element model are verified.(3)On the basis of the rationality of the model,this paper uses three dimensional finite element model to calculate the building construction load and wind load.Then,the change law of horizontal displacement and settlement of tunnel during loading process is analyzed,and the deformation law of tunnel displacement under wind load is studied.The results show that the deformation of tunnel is mainly subsidence,and the horizontal displacement is smaller in the process of construction.Under the action of wind load,the deformation of tunnel has changed accordingly.(4)The displacement and deformation of the tunnel are analyzed by changing the distance between the building and the tunnel and the height of the building,and the protection measures of the tunnel are put forward.