Response Analysis of Dot Shield Tunnels Under Internal Explosion

Abstract:

Dot shield tunnels as a new crosssection of tunnels gradually are increasing in soft metro subway networks,but few studies have been made of their dynamic behavior under internal explosion so far.Based on dynamic finite element method,the paper presents an analysis of the dynamic behavior of dot shield tunnels under the condition of contact and noncontact explosive including 3 kinds of explosive charge,stress states of dot shield tunnels under 3 loading conditions are obtained.Analysis results show that different damages of tunnels occur under the condition of contact,and the damage increases with the increasing of the explosive charge,no damage occurs under the condition of noncontact including 10 kg explosive charge,serious damage occurs under the condition of noncontact including 50 kg and 100 kg explosive charge.The study result provides a reference for safe operation of metro subway.

Key words:implosion; contact; noncontact; dynamic response