El Omari, AbdelhayChourak, MimounNavarro Ugena, CarlosCherif, Seif EddineRougui, MohamedBakali, HassanSánchez Merino, Ángel Luis2022-11-142022-11-142020El Omari, A., et al. Seismic analysis of the zaouiat ait mellal twin tunnels of Agadir motorway (Morocco). In: E3S Web of Conferences: (issue: The Seventh International Congress "Water, Waste and Environment", EDE7-2019), vol. 150, Arcle ID 03001, Feb. 2020, Pp. 1-52267-1242https://hdl.handle.net/10016/36011Proceeding of: Seventh International Congress 'Water, Waste and Environment" (EDE7-2019), Salé, Morocco, November 20-22, 2019Underground structures, such as tunnels, are vital for ensuring all kinds of transportation; and being buried under the surface makes them exposed to soil dynamics. Added to the moderate seismic activity in Morocco, the stability of tunnels is put to the test. This paper examines the interaction between the ZAM (Zaouit Ait Mellal ) twin tunnels between the cities of Marrakesh and Agadir, using the Difference Element Method provided by FLAC 2D software. The acceleration is introduced as the one related to the historic event of El centro 1940 with free-field boundary conditions in the numerical model, with three configurations: tunnel 1 without tunnel 2, tunnel 2 without tunnel 1 and tunnel 1 with tunnel 2. The results of the simulations indicate that the differences values of the maximum displacement, axial force and bending moment on structural elements are very noteworthy from the configuration of the tunnel (single) to the twin tunnels in order to prove the interaction between these latter under seismic loading.5eng© The Authors, published by EDP Sciences.This is an open access article distributed under the terms of the Creative Commons Attribution License 4.0.Atribución 3.0 EspañaZam twin tunnelsFinite difference methodSeismic loadingFree filed boundaryDisplacementAxial forceBending momentconference posterIngeniería Civil y de la ConstrucciónIngeniería Mecánicahttps://doi.org/10.1051/e3sconf/202015003001open access1030015The Seventh International Congress "Water, Waste and Environment", EDE7-2019150CC/0000030738