Abstract: It is difficult to carry out the experiments of explosion and safety for refuge chambers because of the danger and nonrepeatability of the explosion. The structure deformation and distribution of equivalent stress were investigated under different explosion pressure conditions based on the FEM and software LS-DYNA. The results showed that the distribution of deformation and equivalent stress has the same trend on the same surface with the increment of explosion pressure. The deformation and stress on the sides are more serous and larger compared with that of front of the chamber with the same explosion pressure. The stiffener and outer steel are easy to become invalidation because of the maximum equivalent stress. Furthermore， the deformation of the whole chamber is elasticity with impact pressure 1.5MPa. When the impact pressure is 2.0MPa， the deformation of the front still belongs to elasticity but the less plasticity occurs on the stiffener. However， it is safety for the chamber structure because the equivalent stress 283MPa is much less than the tensile strength.

Key words: refuge chamber, FEM(finite element method), gas explosion, equivalent stress, deformation