Using Electronic Detonators to Improve All-Round Blasting Performances

Grobler, Hendrik

doi:10.1076/frag.7.1.1.14061

Cited by 7 publications

(7 citation statements)

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“…Figure 3 shows a graph of percentage pass against size of NONEL and electronic initiations. All figure 3 in red coloured bars represent the amount as muckpile in percentages lesser than the ball size but not fines as required corroborating with [2]. It was observed that from all the shots that were considered for this study, those that were initiated with electronic detonators gave a better percentage pass than those that were initiated by NONEL.…”

Section: Resultssupporting

confidence: 70%

“…Alternative evaluation between electronic *Corresponding author (Tel: +233 245821539) Email addresses: gagyei@umat.edu.gh (G. Agyei) and assabiljnr@outlook.com (A J. Dadzie) detonator and pyrotechnic detonator is the rock fragmentation degree attained after the explosion. The results from [2] reveal the outcomes got in surface mining, mainly on the log-linear plot of muck pile; electronic detonator created a decrease in the upper size and the fines. In contrast, the particle size related to electronic detonator, evaluated by [3] and [4] are steadily greater compared with pyrotechnic detonator.…”

Section: Introductionmentioning

confidence: 99%

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Comparative analysis on the performance of non-electronic and electronic initiation systems on fragmentation distribution at Gold Fields Ghana Limited-Tarkwa Gold Mine

Agyei¹,

Dadzie²

2022

Nig. J. Tech.

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The purpose of blasting is to reduce rock mass to acceptable sizes suitable for load and haul operations to satisfy primary crusher requirement. The crusher settings of Gold Fields Ghana Limited require that about 80 percent of every muckpile be less than the size of 240 mm to enable free flow of materials in the crusher. Initiating blast at Gold Fields Ghana Limited is done by the shock tube non-electronic (NONEL) initiation system as well as the electronic initiation system. As a result of findings from previous studies the shock tube non-electronic system is used more often while the electronic initiation system is used at sensitive areas of the mine specifically the Atuabo pit. However, no detailed current study has been carried out to determine which of these initiation systems is more efficient in terms of the cut-off sieve size of the crushing plant. This paper compares the percentage fragmentation sizes of the blasts produced by the initiations systems used at the mine to determine which of the initiation methods produces 80 percent of the muckpile being less than the size of 240 mm; keeping every parameter related to fragmentation constant. The results obtained reveal that initiating with the electronic system increases the percentage of the required sizes above the 80 percent benchmark. About 33.33% of blast initiated by the NONEL system were below the 80 percent. The achievement by the electronic initiation system could be attributed to the higher precision and accuracy of the electronic detonators.

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Section: Resultssupporting

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Comparative analysis on the performance of non-electronic and electronic initiation systems on fragmentation distribution at Gold Fields Ghana Limited-Tarkwa Gold Mine

Agyei¹,

Dadzie²

2022

Nig. J. Tech.

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“…The detonation of each blast hole must occur in an established order and at certain time intervals, achieving it using micro-delay detonators [ 1 , 3 , 5 , 6 ]. Electric and non-electric blasting caps contain a pyrotechnic delay element that will give the time delay according to its length and reaction speed, acting similarly to a fuse, while electronic detonators contain a microchip that allows programing the detonation time with high accuracy [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

“…[ 8 ]. Dispersion values of pyrotechnic delay detonators are given in several publications [ 7 , 9 , 10 , 11 ], usually being a dispersion between 4 to 8% of their nominal value.…”

Section: Introductionmentioning

confidence: 99%

Arduino-Based Low-Cost Device for the Measurement of Detonation Times in Blasting Caps

Cámara-Zapata,

Arumi-Casanovas,

Bonet-Dalmau

et al. 2023

Sensors

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The use of equipment such as oscilloscopes, high-speed cameras or acoustic sensors is quite common to measure detonation times from surface connectors and detonators. However, these solutions are expensive and, sometimes, not adequate to use in field conditions, such as mining or civil works. In this regard, a low-cost portable device is designed and tested using the Arduino platform, achieving a simple, robust and precise system to carry out field measurements. This study describes the characteristics and working principles of the designed device, as well as the verifications carried out to check the accuracy of the Arduino ceramic oscillator. Additionally, a field test was carried out using 100 actual detonators and surface connectors to verify the correct operation of the designed equipment. We have designed a device, and a methodology, to measure detonation instants with a minimum accuracy of 0.1 ms, being sufficient to carry out subsequent studies of detonation time dispersion for non-electric detonators.

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“…The scope of the delay time is approximately 1 ms to 16 s, and the delay error is only approximately 0.1 ms. Digital electronic detonators can accurately achieve time delay ignition according to the needs of the conditions on site. A strong rock-crushing effect can be obtained using digital electronic detonators, and damage to structures near the tunnel induced by tunnel blasting under complex environmental conditions can be reduced [12,13]. Moreover, the use of electronic detonators leads to not only a smaller Excavation Damaged Zone (EDZ) but also a lower degree of rock breakage in the EDZ [14].…”

Section: Introductionmentioning

confidence: 99%

Tunnel millisecond-delay controlled blasting based on the delay time calculation method and digital electronic detonators to reduce structure vibration effects

et al. 2019

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The reasonable delay time of millisecond-delay blasting using digital electronic detonators can significantly reduce the vibration effects induced by tunnel blasting. This study proposes a method for calculating the delay time for cut holes, easer holes and periphery holes, considering the rocks breaking effect as well as wave superposition theory. And then according to the actual layout diagram of the tunnel holes, the delay time calculation formulas of different holes are put forward. Then the delay times were calculated according to the formulas and applied in the field tests. The velocities, rocks breaking and wave superposition cancellation of the vibration using different delay times are analyzed with digital electronic detonators. Then the optimum delay times of different holes were obtained and applied to New Hongyan tunnel project. The velocity and frequency of the vibration with digital electronic detonators are analyzed, compared with non-electronic detonators. The effects of charge and delay time on the velocity and principal frequency of a blasting seismic wave are discussed. The results indicate that the delay time for the holes must be prioritized to achieve breaking effects in the rock with the simultaneous formation of a new free surface, next considering the wave superposition cancellation. When the delay time of cut holes was 5 ms, the rocks breaking effect and wave superposition cancellation effect both worked well. The velocity of the vibration induced by the cut holes blasting was about only 0.46–0.51 cm/s. When the delay time was 6 ms or much longer, the rocks breaking effect would fail. With regard to the easer holes and periphery holes, the optimum delay time of them were all 5ms. The vertical peak particle velocity was reduced from 2.974 cm/s to 0.901 cm/s with digital electronic detonators. Therefore, the velocity had decreased by 69.70% than non-electronic detonators, which was caused by reducing the single simultaneous explosive charge and setting optimum delay time. The proposed delay time calculation method is demonstrated to be sufficiently accurate and can thus be used as a guideline to reduce tunnel blasting vibrations.

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Using Electronic Detonators to Improve All-Round Blasting Performances

Cited by 7 publications

References 0 publications

Comparative analysis on the performance of non-electronic and electronic initiation systems on fragmentation distribution at Gold Fields Ghana Limited-Tarkwa Gold Mine

Comparative analysis on the performance of non-electronic and electronic initiation systems on fragmentation distribution at Gold Fields Ghana Limited-Tarkwa Gold Mine

Arduino-Based Low-Cost Device for the Measurement of Detonation Times in Blasting Caps

Tunnel millisecond-delay controlled blasting based on the delay time calculation method and digital electronic detonators to reduce structure vibration effects

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