Foundation Settlement Response of Existing High-Speed Railway Bridge Induced by Construction of Undercrossing Roads

The construction of undercrossing roads often has an adverse effect on the upper existing railway line, and can cause uneven subsidence crossed section. In response to influence new road high-speed bridge, a highway passing under bridge was taken as research object. Based FLAC3D finite difference software, computational model established analyze structural deformation bridge. results show that excavation foundation pits during causes overall upward heaving soil layers between pits, with greater amount near piers than at other locations. Meanwhile, degree displacement occurred. filling base structure generates additional stress original consolidation pressure, inducing pits. final shows adjacent piles is manifested settlement horizontal side excavation.