Mid-deep hole cutting blasting technology based on slit charge directional presplitting

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (3) : 322-329.

CHENG Bing1,2, WANG Haibo2, ZONG Qi2, XU Ying2, WANG Mengxiang2

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Abstract

Aiming at the poor effect of mid-deep hole cutting blasting in rock roadways, a mid-deep hole cutting blasting scheme based on directional presplitting of slit charge was designed. Firstly, the influence of directional presplitting on the cutting cavity formation was analyzed theoretically. Then, simulation was conducted to reveal the damage process and damage mechanism of rock mass in the cutting cavity. Finally, field tests were carried out to explore its application effect. Results showed that directional presplitting faces could be formed along the line of presplitting holes after slit charge blasting in each presplitting hole. Directional presplitting faces owned free face reflected tensile effect and stress wave barrier effect, thus the rock mass in the cutting cavity could be fully damaged to form rock fragments which were easy to be thrown. And they could reduce the cavity formation resistance, which was conducive to the cavity formation after cutting hole blasting. The numerical simulation could visualize the damage process of rock mass in the cutting cavity, and the free face reflected tensile effect and stress wave barrier effect of the directional presplitting face could be proved by simulation results. Compared with the existing ordinary cutting blasting technique, when the innovative cutting technique was used in the mid-deep hole blasting of a rock roadway, the average effective footage and average hole utilization rate were increased by 0.29m and 11.6% respectively, and the average explosive consumption and average detonator consumption were reduced by 0.19kg•m-3 and 0.13 PCS•m-3 respectively. The results verified the applicability of the novel cutting technique in the mid-deep hole blasting of rock roadways.

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mid-deep hole cutting blasting / slit charge / directional presplitting / theoretical analysis / simulation

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CHENG Bing1,2, WANG Haibo2, ZONG Qi2, XU Ying2, WANG Mengxiang2. Mid-deep hole cutting blasting technology based on slit charge directional presplitting[J]. Journal of Vibration and Shock, 2023, 42(3): 322-329

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