Dynamic responses of a reinforced concrete（RC）wall and a RC blast wall in an underground magazine are numerically simulated in the present paper.In the simulation

AUTODYN together with RHT model for concrete are employed.Firstly

blast loads acting on RC wall and blast wall are calculated.In the simulation

the mass of the explosive considered is according to the possible mass of the explosive

say

200 kg TNT per bay group and placed at the center of the storage chamber floor.For the RC wall

two dimensional simulation is carried out to calculate the pressure time history acting on the RC wall due to the accidental blast in the neighbor chamber.For the blast wall near the exit on the ground level

three dimensional wave propagations inside and outside the magazine due to accidental explosions in an underground chamber are modeled first to analyze the blast wave propagation and the airblast overpressure acting on the blast wall.The dynamic responses of RC wall and blast wall are calculated.It is found that both the RC separation wall and the blast wall are severely damaged.For the RC separation wall

obvious plastic hinge line could be found and the overall deformation is large;while for the RC blast wall

entire collapse occurs.