Dynamic Response of New Cementitious Material Pasted Backfill under Explosion Loading

To study the effect of the explosion caused vibration on the roof of the pasted backfill, which use a new cementitious material agent as the backfilled agent in substitution of cement in the downward slicing drift mining, we first conducted blasting test, theoretical analysis and test data regression analysis, and then simulated the dynamic response of the new pasted backfill under explosion loading using the FLAC^3D software. The simulation results show that, under the same explosion loading, the peak particle velocities in x, y, z directions of the new pasted backfill with cement-sand ratio 1: 6 and 1: 12 is slightly larger than those of the cemented pasted backfill and their difference is within 6.8%; while the peak particle velocities of the new pasted backfill with cement-sand ratio 1: 8 is slightly lower than those of the cemented pasted backfill. It can thus be concluded that the new cementitious material agent can be used for backfill mining with the requirements equally well satisfied of the original engineering blasting design.