The Structure Deformation Of The Viaduct Of The Airport Line Passed By A Large Diameter Shield Tunnel Of Beijing Subway Line14and Research On Controlling Measure

For its security, automated operations and not affection on the ground transportation, the shield tunnel construction method for has got a good application and rapid development in the construction and development of urban rail transit. With the urban population increasing and urbanization accelerating, the metro construction will still continue and the shield tunnel construction method will continue to have a significant role. However, the land subsidence can be caused by the strata loss because of the construction of shield tunnel, further the structure of the existing subway lines on the ground has deformation, then many Unfavorable factors have a bad influence on the safe operation of train on the existing line.The paper is based on what a large diameter shield tunnel of Beijing Subway Line14from GaoJiaYuan to JingShunLu passes through the viaduct of the Airport Line for the first time, the finite element analysis software such as ANSYS is applied to simulate the process that the large diameter shield tunnel passes through the Airport Line, analyze the influence of the existing structure caused by construction of shield tunnel and the tuberose pile'function in reducing the influence. What's more, the paper has studied that the influence of the Airport Line is caused by the construction of the big shield tunnel passing through the viaduct in different locations and provided a reference for future engineering of the shield tunnel. The two subjects are mainly discussed in the paper as following:(1)The finite element analysis software such as ANSYS is applied to establish the three-dimensional solid model of strata and structure and simulate the process that the large diameter shield tunnel passes through the Airport Line, analyze the deformation of the existing structure while the tuberose pile is operated in the different ways and the tuberose pile' function in reducing the influence caused by construction of shield tunnel.(2)The ANSYS software is applied to simulate the process that the large diameter shield tunnel passes through the Airport Line in the different locations, analyze the deformation of the viaduct and put forward that the spacing between the shield tunnel and bridge piles is main factor in controlling the deformation of the viaduct, and provide some reasonable suggestions for the construction of big shield tunnel.