Numerical simulation for dynamic response of a mine rescue chamber subjected to explosion impact in a tunnel

Using the commercial FE software AUTODYN, dynamic responses of a type of cylindrical rescue chamber subjected to explosion impact in a tunnel were analyzed based on the fluid-solid coupling method. Simulation results showed that under 2.14 MPa peak pressure of impact loading, the maximum equivalent stress generated under the front end surface shock or the back end surface shock was below the ultimate strength; the maximum displacement of the center of the blast surface does not exceed the requirements of failure criteria, so the strength of the rescue chamber meets the requirements of national standards; when the blast surface is changed into a planar structure, the strength failure and deformation failure occurr under the same explosion impact, so the blast surface of a protruding structure can enhance the anti-impact ability of the rescure chamber. The results provided a scientific foundation for design modification and safe use of rescue chambers.