Abstract: For evaluating damage of strong explosion,boundary conditions of coupled Eulerian-Lagrangian calculation are used.Energy accumulation due to radiative transfer is considered.Coupled methods of two-dimensional numerical simulation with cylinder symmetry are established,which calculate simultaneously equations of radiation hydrodynamics and hydro-elasto-plastic.Full physical processes of underground strong explosion are presented.They are propagation of radiation front in detonating room,transmitting of radiative energy to wall of detonating room,inward expanding of detonating room wall,propagation of shock wave in rock,compressing of high-pressure in detonating to room wall and outward expanding like waves of detonating room wall.

Key words: underground strong explosion, radiation hydrodynamics, fluid-solid interaction, numerical simulation