In order to evaluate the inner explosion effect of sectional tunnel in subway in Nanjing
the engineering situation of inner explosion of 10 kg TNT with 1.1 m distance from tunnel bottom is numerically simulated with LS-DYNA3D.The keyword of simulation of air blast due to conventional weapon avoids complex and trivial Euler calculation and ALE coupling analysis
so as to simplify model construction. The history of displacements and velocities of different nodes were obtained
the history of acceleration of elements and their maximum principal strain were obtained as well. The result that the sectional tunnel in subway is safe with inner explosion of 10 kg TNT.