Numerical Simulation Analysis For Influence Of New Tunnel On Existing Tunnel And Surroundings

With the development of railway construction in China, more and more newmultiple tracks are soon put into construction. Because of topography and geologylimit, new tunnel is close to existing tunnel;meanwhile, during the shield tunnelconstruction, the existing tunnel and environment will be affected greatly, due tosophisticated geological conditions.The finite element method is the main method of tunnel excavating. In this paper,ABAQUS program and numerical simulation is applied to simulate the probablyeffect of new tunnel, adopting the geologic informatics of the continuous constructionof one number line in the second period of time of Shenzhen City Railway TrafficSystem. During the analytic process, considering nonlinear of soil, interaction of soiland liner, lamination of soil, underground water and so on, ground settlement, linerdeformation and endogen force change of existing tunnel, plastic zone of soil, porechange of underground water, building on the ground, pile foundation andunderground pipeline are simulated to analyze, according to practical situation ofengineering. For the analysis of tunnel, different depth of burial, spacing interval andstiffness of subjacent bed are considered;for the analysis of building on the groundand pile foundation, relative position is mainly considered;for the undergroundpipeline, depth of burial, relative position, material texture and stiffness of subjacentbed are considered. For the effect of the right line tunnel excavating process, 3Dmodel is adopted to simulate. Some conclusions are summarized to providecorresponding guidance for subsequent project.