Materiały konferencyjne SEP 2019

a structure, the supports are comprised of four, five or six arches. The floor may be enclosed by two, three or four arches. It is significant that the shape of the structure, the length of the over- lapping sections of the arches, the number of stirrups, the reinforcement by means of girders, the bolting as well as the reinforcement by means of shotcrete with cement slurry injection be- hind the supports, allowed to achieve an increased yielding and threshold capacities.