Tunnel excavation is frequently carried out in rock masses by the drill and blast method and the final shape of the tunnel boundary can be irregular due to overbreaks. In order to investigate the effects of overbreaks a study of the effect of tunnel boundary irregularity has been carried out. This is done developing a computational tool able to take into account fuzzy variables (i.e., thickness...

The usefulness of fiber reinforced concrete (FRC) in various civil engineering applications is indisputable. Fiber reinforced concrete has so far been successfully used in slabs on grade, shotcrete, architectural panels, precast products, offshore structures, structures in seismic regions, thin and thick repairs, crash barriers, footings, hydraulic structures and many other applications. This p...

The deterioration of rock mass and shotcrete lining has major consequences on the long-term performance tunnels in weak mass. In this study, behavior was simulated by using three-dimensional finite difference method, considering nonlinear mechanism. degradation weakening mechanical parameters, while modeled decreasing thickness. support pressure, internal force, displacement secondary were moni...

This paper presents the results of investigation properties fine-grained concrete on expansive cement for fiber-reinforced shotcretes used metro tunneling. Basic factors affecting material expansion after mixing with water are described. The influence components values strength indices and volumetric deformations shotcrete is studied. Improvement process, physical mechanical, operational charac...

Synthetic fibers, which have become one of the main components shotcrete, been studied by many researchers in laboratory environment. Unfortunately, results obtained as a result these researches are not suitable for underground chimneys due to differences ambient conditions and application differences. In this study, it is aimed compare experiment samples prepared kept with mechanical propertie...