Evaluation of the Internal Blast Performance of Explosives Based on Roof Lift Test

To evaluate the blast performance of explosives in a closed/semi-closed structure,the internal blast test of five kinds of typical explosive charges was carried out through a self-built roof lift test device.The internal blast power was evaluated by shock wave overpressure and roof lift displacement.The results show that the internal blast performances of some explosives with higher shockwave overpressure are not necessarily better.The air blast performances and internal blast ones have significant difference.The roof lift maximal displacement(xmax)has a good liner relationship with heat of combustion(ΔHas)by asynchronous self-oxidation,and the relationship formula is xmax=17.717ΔHas-5.322,correlation coefficient R2=0.991 7.Internal blast type explosive should have high heat of combustion,high heat of reaction by asynchronous self-oxidation and moderate detonation velocity.