Influence of Medium and Deep Hole Blasting on Artificial False Roof in Stopes
In order to investigate the influence of blasting on the stability of artificial false roof,LS-DYNA simulation dynamic analysis software was used to calculate the disturbance and damage of artificial false roof with thickness of 4.75 m under medium and deep hole blasting.The results show that during the propagation of stress waves from the bottom to the hole opening,the blasting stress gradually decreases,and the distribution is uniform in the artificial false roof,with fast attenuation.After leaving a 0.5 m protective layer at the top,the maximum effective stress value of most units in artificial false roof is less than the plastic zone failure stress of the filling body,indicating that the blasting effect has little impact on the damage of artificial false roof.On-site blasting tests were conducted in a lead-zinc mine,and displacement monitoring points were set up at key positions of the artificial false roof.The test results show that after medium and deep hole blasting,there is no collapse or caving phenomenon in the artificial false roof and side walls,the roof settlement is reasonable,and blasting effects are good.
Artificial false roofMedium and deep hole blastingBlasting damageNumerical simulation
万方数据
维普
