1/6/2015 · The studies presented in Table 1 comprise concrete blocks (B) and precast concrete segments (PS). Some of these studies examined real tunnels (e.g., the Barcelona Metro Line 9 in Spain (Gettu et al., 2004), Hydraulic Tunnel of Montelirio in Panama (De Rivaz, 2008, Caratelli et al., 2012), the Brenner Base Tunnel joining Italy and Austria (Hilar and Vítek, 2012) and the Prague Metro Line