METHOD TO CONDUCT DRILLING AND BLASTING OPERATIONS AT DRIFTING

摘要

A method to conduct drilling and blasting operations while drifting includes drilling in face of working sets of cut, outside and cropper holes with charging those and with sequential delayed blasting with, beginning from cut ones. After charging holes to given length of charge L, at mouth of those one forms a plug made of expanded polymer as primary plastic-viscous composition on polyurethane basis with gas saturation under pressure and with foaming with primary transformation of filling formed at its gradual curing with formation of mostly closed and disconnected one from another cellular cavities separated with polymer layers. After formation of the plug at its curing one performs sequential blasting with delay of blast holes of sets, beginning from cut ones with sealing, compression and with secondary transformation of the formed plug under effect of pressure of detonation wave of gaseous detonation products in direction of hole mouth to rigid enough elastic-damping state as conglomerate substance.