The high-stress concentration, accompanied by the significant disturbance of the surrounding strata are the effects that characterise the construction of the transition areas that connect a vertical shaft with the subway tunnel by a cross passage due to the complex and irregular geometries at these intersection areas. Considering a case study of a project that includes eight ventilation\emergency shafts connected to a metro tunnel by different lengths of cross passages, this thesis studies the behaviour and the stability of the construction at the transition areas. Moreover, the good and worst scenario has been studied based on the geological conditions in the intersection areas among the eight regions.