Analysis of the Effects of Explosions in Twin Tunnels on Lining of Accident Tunnel and Adjacent Tunnel with Different Shapes

摘要: Consequently, horse-shoe tunnels have better performance. Recently, public places and underground transport facilities such as subways and urban transport tunnels and routes have been the targets of terrorists. In this regard, there have been reports about Explosion in these tunnels. twin tunnels are built because of their structural strength and ease of construction. In this study, the behavior of tunnels with different cross-sectional geometries was examined numerically using the FLAC software under the impact of explosive forces. Thus, the performance of twin tunnels with three different shapes under internal Explosion was studied in this research work. The results suggest that the twin tunnels with horseshoe cross section compared to rectangular cross section have better performance. Introduction Sadegh azar et. al.(2009) studied the impact of surface Explosion s on tunnels in different conditions. Ghaemi (2011) explained the effect of emission of missile compressive waves and their impact in continuous and discontinuous environment. Liu (2012) presented the nonlinear response of tunnels buried under explosive loading. Lee (2006) studied the stability of a tunnel, which was adjacent to an exploded tunnel. Tian (2008) studied the dynamic response of multi-story buildings affected by Explosion in one of the twin tunnels. The effect of cross-sectional shape of twin tunnels that have not been investigated in these studies, is examined in this paper. Methodology and Approaches The shapes of twin tunnels were adopted from the code 161 of Ministry of Road and Urban Development. In this study, four types of twin tunnels have been considered …