Considerations on the explosion resistant design of special infrastructures have increased in the recent
years. Amongst the various types of infrastructures, road and railway tunnels have a unique importance due to their
vital role in connection routes in emergency conditions. In this study, the explosion effects of a projectile impacting on
a railway tunnel located in a jointed rock medium has been simulated using 2D DEM code. Primarily, a GP2000
projectile has been considered as a usual projectile and its penetration depth plus its crater diameter were calculated
in rock mass. The blast pressure was, then, calculated via empirical formula and applied on the boundary of crater as
input load. Finally, the wave pressure propagation through the jointed rock medium was investigated. In part of the
study a sensitivity analysis has been carried out on jointed rock parameters such as joint orientation, dynamic modulus
and damping ratio. Their effects on tunnel lining axial force as well as bending moment have also been investigated.
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