교차터널 시공 시 도시철도 궤도 안정성 평가

Management institutions for urban railways have constructed transfer station in high floating population areas to provide an easy transfer for passengers. Most of tunnels in transfer station are constructed across above and below each other. The construction of the tunnels and superstructures induces the stress variation of ground in adjacent to the existing urban railways, the transformation of underground structures, and finally results in track irregularity. Track irregularity results in a rough ride, a wearing of rail, and even train derailment. In this study, the commercial program, FLAC3D, which is a three-dimensional finite-difference numerical code is used to do stability analysis of track by estimating track irregularity as the weight of superstructures is applied on ground surface and the intersection tunnel is constructed below the existing tunnel. Numerical results show that vertical and horizontal transformations are induced by the construction of intersection tunnels. Track irregularity is mainly induced by the vertical transformation .