Analysis of safety effect on explosive in loaded cavern under the surface blasting

摘要

In order to ensure the safety of explosive charged in underground cavern during the transition of opencast-underground combined mining, the safety effect of charged explosive under the surface blasting is analyzed by field measurement, theoretical analysis and numerical simulation from the aspects of heat sensitivity, mechanical sensitivity, detonation sensitivity, shock sensitivity.The software ANSYS/ LS-DYNA was applied to simulate and assess the influence of surface blasting seismic wave on the caverns.Based on the seismic wave data collected from IDTS3850, Sadov's formula was used and the wave's declination of surface blasting vibration in vertical direction was concluded.The results show that the heat induced from surface blasting is not enough to trigger the loaded explosive, blasting vibration wave cannot make the underground caverns collapse, the pressure from blasting vibration wave reaching the caverns is not strong enough to detonate the explosive.