The distribution of stresses and strains during the portal section excavation for the right tube of the Sleme Tunnel is analysed by the Finite Element Method (FEM). Results of analyses obtained using 2D and 3D models have been compared to in-situ measurements of tunnel convergence and ground surface settlements. Multistage excavations with pipe roof support of the working face were modelled. The numerical models verified that for this particular case a sufficiently safe and cost-efficient construction technology was applied.Original Abstract: Analizirano je stanja naprezanja i deformacija tijekom iskopa portable dionice desne cijevi tunela "Sleme" primjenom metode konacnih elemenata. Napravljena je usporedba rezultata proracuna ravninskog (2D) i prostornog (3D) modela s rezultatima terenskih mjerenja konvergencija u tunelu i slijeganja povrsine terena. Modelirani su visefazni iskopi s ojacanjem cela cijevnim krovom. Proracunski model je pokazao da je u navedenom slucaju primijenjena dovoljno sigurna i ekonomicna tehnologija iskopa.