Preferred Intact Rock Orientation and Controlled Blasting
The purpose of this paper, from the geologic structure point of view, is to find an easy way to amplify the complex geologic conditions contributing to rock fragmentation by blasting. The core-blasting test is designed to model the relationship between pre-existing grain distribution or visible discontinuities and new fracturing patterns. A very important finding, in core blasting tests, is that the majority of fractures always initiates and propagates in the Preferred Grain Orientation (PGO). Based on the analysis of PGO, it can be deduced that the blast-induced fractures and rock fragmentation is completely dominated by the Preferred Intact Rock Orientation or PIRO. Mining production at Sigma mine shows that the smaller the angle between rock movement direction and PIRO, the better fragmentation is achieved. This paper also introduces PIRO program developed in 2003, which is employed to determine PIRO in the condition of different sets of discontinuity. Finally, this paper demonstrates that the PIRO-based blasting design (technique) will be significant in improving mining efficiency, fragmentation, and reduction of vibration.
wall control hlasting rock fragmentation blast fracturing fracture orientation facture effects
Siwei(Joseph) He
Mining Engineer at Sigma Mine, Valdor, Canada
国际会议
The Asian-Pacific Symposium on Blasting Techniques(亚洲太平洋地区爆破技术研讨会)
昆明
英文
156-160
2007-05-08（万方平台首次上网日期，不代表论文的发表时间）