| With the rapid development of urban infrastructure,underground rail transportation is playing an increasingly important role.In the background of more and more dense subway lines,the existing construction of new subway lines across the ground and underground is is becoming more and more complex.The new project is not only to cross the single existing structure,but also to cross the complex and complex structure.The problem of complex crossing will be more prominent in the future.In this paper,in view of the Beijing Metro Airport Line,which is closely attached to the Dongzhimen station of the existing line 2,and at the same time passing through the east straight gate bridge,on the basis of thorough investigation and understanding of the subway line crossing project at home and abroad,the theoretical exploration and numerical simulation calculation techniques are applied to the existing structural subsidence caused by different crossing schemes.The deformation law and bearing capacity of existing structures are analyzed and compared.The research and analysis of the impact of existing structures on the construction of new tunnels under the existing structures are carried out.(1)Select the corresponding construction plan according to the characteristics of the project and analyze its action mechanism.(2)The "formation structure" model is established to simulate the construction process of new subway tunnels.Select the best construction scheme,and for the best solution from the deformation of the existing station and Bridge settlement,both internal force and structure stress perspective,analysis the influence of different construction steps of the above point of view,summed up the construction steps generated by the settlement of total settlement ratio,and optimize the program.(3)The construction scheme of bridge girder lifting design,and monitoring plan,ensure the new range of wear under construction,the safety of the bridge structure. |
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