Numerical Modelling of the Behavior of Tunnel in Soft Surrounding Rock: A Case Study of Djebel El-Ouahch Tunnel, Algeria

The response of a massif to stresses generated by tunnel excavation depends essentially on the geological conditions, geometry and its underground position. major problem related construction these structures is ensure stability whole tunnel-ground, controlling various deformation during construction. In this context, present paper examines effect conditions behavior tunnels surrounding soil. study applied real tunnel, in case Djebel El Ouahch, Algeria was taken as reference model. research includes parametric evaluate several parameters soil such anchoring depth, tunnel-soil interface rate, shape cross section. analysis performed using PLAXIS 3D TUNNEL calculation code with an elastoplastic Mohr–coulomb model for behavior. results show that strongest most stable position mid-deep circular section, non-slip between ground. These outcomes can help understand effects influences which control bad characteristics.