| ||This paper were analysed effect application of primary support- shotcrete
and anchors, to increase the strength factor of rock mass around the tunnel opening.
Numerical modeling of tunnel excavation was done using the program Phase2, which
based on the finite element method, and which depending on the characteristics of rock
mass and the analysis undertaken, provides, among other things, the possibility of
selecting an appropriate fracture criterion (Hoek-Brown, Mohr Coulomb, Drucker
Prager i Cam-Clay).
Numerical analysis of this paper were made, showed that the application of shotcrete
and anchors contributes to increase the strength factor, and therefore the reduction in
radius plasticized zone in rock mass around the tunnel opening. This fact is non negligible, especially when it comes to stabilization of the rock masses of poorer quality,
because in thi sway allows the controlled deformation of rock masses.|