3D FEM Model on the Parameters’ Influence of EPB-TBM on Settlements of Single and Twin Metro Tunnels During Construction

Abstract The present research exposes the investigation on three-dimensional modeling of single and twin metro tunnels for case Tehran line. At first, simulation implemented comparison ground movements in tunnels. Then has been performed influence effective parameters EPB-TBM surface settlements throughout excavation. overcutting, shield conicity, grouting, final lining system modeled face supporting pressure, grout injection as well clear distance tunnels, analyzed. initial results showed a valid settlement behavior. maximum occurred at end tail it was higher tunnel. pressure had more effect to pressure. By increasing tunnel, place moved back while is insignificant decreasing settlements. Furthermore, led zero after length 30 m. Accordingly, distances, must be examined independently two different