Determining the Pocket Charge Design for Effective Fragmentation of Caprock in Surface Mine Blast Operations
0
조회
0
다운로드
1
인용
0
참고문헌
키워드
초록
Surface mining operations often face issues due to boulders caused by caprock layers. Caprock substantially impacts the productivity of the mine by obstructing rock fracture and posing safety hazards. This study aimed to determine an optimal bench blast design for areas where caprock is present. An initial bench blast model was designed based on the Langefors method, and the effects of caprock were simulated using AUTODYN. The Scaled Depth of Burial (SDOB) was employed to evaluate the effects of pocket charge location. The simulation revealed a 15% damage improvement with only 5% of the total explosive as a pock charge. The SDOB analysis concluded that positioning of pocket charges at the 3/5 point of the caprock thickness and making up 25% of the total explosive charge effectively crushes the caprock with minimal flyrock.
Abstract
Surface mining operations often face issues due to boulders caused by caprock layers. Caprock substantially impacts the productivity of the mine by obstructing rock fracture and posing safety hazards. This study aimed to determine an optimal bench blast design for areas where caprock is present. An initial bench blast model was designed based on the Langefors method, and the effects of caprock were simulated using AUTODYN. The Scaled Depth of Burial (SDOB) was employed to evaluate the effects of pocket charge location. The simulation revealed a 15% damage improvement with only 5% of the total explosive as a pock charge. The SDOB analysis concluded that positioning of pocket charges at the 3/5 point of the caprock thickness and making up 25% of the total explosive charge effectively crushes the caprock with minimal flyrock.
참고문헌 (17)
- "ANSYS" (2023)[URL]
- Ayala Carcedo, "Drilling and Blasting of Rocks" (1995), Routledge
- Chiapetta, R., "The use of high speed motion picture photography in blast evaluation and design", Paper presented at the Proceedings of the Ninth Conference on explosives and blasting technique-Society of explosives engineeringAnnual meeting (1983)
- Dyno Nobel, "Explosives Engineers' Guide", Freshwater Place, ~ (2020)
- Gokhale, B.V., "Rotary drilling and blasting in large surface mines" (2010), CRC Press
- Kang, S. -S., "A case study on tunnel blasting design evaluation considering blast damage zone,", Science and Technology of Energetic Materials, 81(4), pp.106~113 (2020)
- Langefors, U., "The modern technique of rock blasting" (1967), Wiley
- Oates, T. E., "Stemming and best practice in the mining industry: A literature review", Journal of The Southern African Institute of Mining and Metallurgy, 121(8), pp.415~426 (2021)
- Oriard, L. L., "Resolution of Some common problems in highway blasting", Transportation Research Record, 119~125 (1987)
- Case Study: Improving Cap Rock Fragmentation and Vibration Management Open Cut Iron Ore Mine, "Orica Mining Services", ~, pp.Document reference number 100115 (2009)
- Riedel, W., "â Beton Unter Dynamischen Lasten: MesoUnd Makromechanische Modelle Und Ihre Parameter" (2004), Fraunhoferâ Ernst-Mach-Institut
- Riedel, W., "10 years RHT: a review of concrete modelling and hydrocode applications", pp.143~165 (2009), Springer
- Singh, S. P., "Rock Fragmentation by Blasting: Causes, implications and control of oversize during blasting" (2010), CRC
- Stiehr, J., "ISEE blasters’ handbook, Cleveland" (2011), International Society of Explosives
- "University of Calgary" (2023)[URL]
- US Bureau of Reclamation, "Engineering geology field manual, US Department of the Interior", Bureau of Reclamation, ~ (1988)
- US Bureau of Reclamation, "Engineering geology field manual", US Department of the Interior, Bureau of Reclamation, ~ (1991)