The digging of one or more tunnels is a process that destabilizes the field, maintaining the stability of the tunnel wall and

control of ground movements around the gallery resulting from each excavation and the interaction between two tunnels mu

st

be controlled. This research aims to analyze and understand the physical mechanisms games during the digging of two twin

tunnels throughout the spatial configurations and evaluated the ground motion induced by the interaction between

these two

lasts

. Th

e three

-

dimensional effect of widening is taken into account using the decontainment



rate of soil adjacent to the

excavation by the application of the convergence

-

confinement method. The modeling work is executed in two

-

dimensional, by

using the finite d

ifference code Flac

-

2D. A comparison of numerical simulation results with in

-

situ measurements was

established in the particular case of two parallel horizontal tubes of the tunnel T4 on Elharouche Skikda and for which

experimental data exist.