Experimental Study on Self-expanding Filling Body in Upward Medium-length Hole Blasting in Meishan Iron Mine
In view of the lack of suitable filling materials for upward medium-length hole blasting,re-sulting in low utilization rate of explosive energy and poor blasting effect,a self-expanding filling body with high strength and strong expansion pressure was developed.Based on its expansion and hardening character-istics in the borehole,the self-expanding filling body can theoretically prolong the action time of blasting gas and improve the utilization rate of blasting energy.The test results show that compared with the stem-ming,the blasting vibration velocity of the blasting hole filled with the self-expanding filling body is higher,and the bulk rate and the peak value of the block are reduced,indicating that the explosive energy acting on the rock mass is higher.In addition,the self-expanding packing can effectively inhibit the damage of the blasting energy concentration at the orifice to the brow line,which is beneficial to the protection of the brow line.The self-expanding filling body has small volume and good filling performance,and has a good prospect of popularization and application.
upward medium-length hole blastingself-expanding filling bodyblast vibrationbrow line
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