ABSTRACT
Primary support and final lining design for tunnels in the vicinity of a slope should consider the influence of the slope excavation over the ground strain-stresses. The impact on tunnel design depends on rock mass properties, geometrical dimensions of the slope excavation and relative distances but also the construction timing between both excavations is a remarkable issue to be considered, not affecting equally whether the slope excavation is carried out before tunnel excavation and before or after final lining of the tunnel is executed. This paper will present a study of the impact of a close slope on the support and lining of a tunnel constructed using the New Austrian Tunneling Method (NATM). Using the software Plaxis2D, different construction sequence scenarios were evaluated. The research aims to provide a technical referential basis for the planning and design of infrastructure projects involving the construction of slopes and tunnels under similar conditions.
