Mechanical Simulation And Analysis Of Metro Station On The New Line Cross The Existing

At prensent, it is an inevitable problem that the newly built station of metros crossing the existing in the planning and construction of metropolis traffic network. The interaction of the close-spaced construction is very complex. How to make these influences into minimum becomes an important task. Thus, it can not only pledge the construction to go on wheels, but also the existing lines to secure, normal operation and to seek a safe, economic, reasonable construction method.In virtue of the faultiness of the construction of railway networks in China, it can be predicated that, in the course of the future subway railway networks construction, the tri-dimension engineering on newly built and the existing railways will occur successively. Without question, a deep research on the influence of the newly built station crossing the existing in construction and the interaction of the close-spaced construction will be very profitable and essential.The paper takes the athletics west road station in Guangzhou as a research object. The whole construction process of the newly built railways is under the existing metro station is simulated by numerical computation. The effect on down-crossing station to the existing is analyzed. The main contents for researching are as follows:(1) In calculation, the interaction mode of the formation and structure of the elastic-plastic three-dimensional FEM is adopted. And considering the space influence in construction, the 3D-FEM analysis is carried by FEM software Ansys. The internal force space distribution of the main part, the development of the deformation and the variation regularity are analyzed.(2) The influence of the ground surface settle on the transport of existing subway is studied. Adequately choose mechanical parameters and support structural. And find a reasonable construction method, such as decreasing the dig size,strengthenning the protection before construction,decreasing the influence of explosion to the round of rock. Since the current station carries normally, and the station of new line is constucted smoothly.(3) By studying evaluation indicator and method of the undercut tunnel construction to the safety of the existing structure, and reference to the former construction experiences, the controlling value of the ground surface settlement is obtained by calculation. It can be regarded as monitoring and survey index in construction.Finally, the main conclusions, the problems and the technical innovations are expounded and some own opinions are proposed in the paper.