Parametric Study Of The Mechanical Response Around A Tunnel (example Of Application: Algiers Metro)

Tunneling at shallow depth can induce ground movements that may cause deformation and in extreme cases of severe damage to surface structures. This work deals with the setting of the hydro mechanical response around a tunnel. a numerical analysis of the effect of excavation of a tunnel towards a low multiple-stage structure centered over the axis of a tunnel. The study is performed using the computer code Plaxis 8.2 which is based on the finite element method (FEM) in plane strain. The analysis applies to a real case in this instance the Algiers metro, excavation was conducted using the New Austrian Method (NMA) taking account of deconfinement. Our objective in this work is to make a parametric study of geometric parameters differing and so the geotechnical parameter mesh position and lap