Propagation of Peak Strain and Strain Energy From Explosion-Generated Strain Pulses in Rock1

Fogelson, D.J.; Atchison, Thomas C.; Duvall, Wilbur I.

doi:10.1785/gssrl.30.3.34a

Cited by 4 publications

(3 citation statements)

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“…The strain waves generated by the spherical charge carry wave energy through radial and tangential wave components. Fogelson et al (1959) showed that except at distances very close to the source, the contribution of the tangential component is small compared to the radial component.…”

Section: Wave Energymentioning

confidence: 99%

An equivalent spherical charge conversion (ESCC) approach for prediction of ground vibration due to blasting

Roy

2017

Mining Technology: Transactions of the Institutions of Mining a

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Peak particle velocity generated by cylindrically-charged blastholes fired at different delay detonators in surface blasting can be predicted with reasonable degree of certainty by an equivalent spherical charge conversion (ESCC) approach wherein the cylindrical charges are replaced by equivalent spherical charges. The validity of this conversion model has been tested through different predictive equations using experimental data of two opencast mines viz. Bhelatand Amalgamated Colliery and Joribahal Iron Ore Mine. In deriving these equations both maximum charge per delay and total charge fired in the round were considered separately. The results show that ESCC approach can be used as a reliable vibration prediction tool in surface blasting.

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Section: Wave Energymentioning

confidence: 99%

An equivalent spherical charge conversion (ESCC) approach for prediction of ground vibration due to blasting

Roy

2017

Mining Technology: Transactions of the Institutions of Mining a

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“…Blasting and explosive usage are potential sources of many human and environmental hazards. Actual rock breakage effectively utilised only about 5 to 15% of the total available explosive energy released during blasting [10], [11]. Sanchidrian et al [12] studied energy efficiency in the single-hole confined blast and concluded that available fragmentation energy is 2 to 6% of the total energy.…”

Section: Introductionmentioning

confidence: 99%

Blasting efficiency in granite aggregate quarry based on the combined effects of fragmentation and weighted environmental hazards

Shehu¹,

Yusuf²,

Zabidi³

et al. 2023

Min. miner. depos.

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Purpose. Mine and quarry operators determine blasting efficiency by the sizes of fragments, while regulatory agencies evaluate the same from the level of environmental discomfort. Thus, a conflict of interest exists. This research distinguishes fragmentation efficiency from blasting efficiency. It proposes a new approach for evaluating blasting efficiency to break the conflict of interests between the quarry operators and the regulatory agencies. Methods. Five blasting events in the FYS granite aggregate quarry have been studied, and design parameters have been obtained. As an indicator of blast-induced environmental discomfort, vibrations and air blasts are measured using a seismograph. The WipFrag desktop and Kuz-Ram model are used to assess the resulting fragmentations. Blasting efficiency is evaluated as a function of fragmentation and environmental constraints. Findings. The powder factor affects the fragment size distribution and the environmental hazards of blasting but in a conflicting manner. Increased powder factor enhances good fragmentation but results in further environmental discomfort. Blast event 4 has the highest fragmentation efficiency of 46.53%, while 3 has the highest environmental control efficiency of 69.47%. Cumulatively, blast event 4 has the highest overall blasting efficiency of 45.43%. Future research is expected to standardise this novel approach and incorporate more blasting effects. Originality. This work is the first attempt to quantify the efficiency of blasting operations in the aggregate quarry by combining the fragmentation produced and the resulting environmental hazards in a single model. Practical implications. The model proposed in this research can be adopted by quarry operators and regulatory agencies for sustainable quarrying and mining to address identified conflicts of interest between them.

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“…In contrast to normal free face bench blasting, the energy of a radial compressive wave striking the wall of a relief hole for the burn-cut pattern is reflected in a more convex form and the rate of dispersion of energy from a curved surface is greater than that obtained from a planar free face. [22][23][24][25][26][27] This paper proposes a conceptual model of a hollow cylinder with the wall thickness equal to the difference between the radius of the ring of relief holes and the charged holes to investigate a situation with a charged hole in the centre and a ring of burn/relief holes surrounding the charge hole as shown in Fig. 3a.…”

Section: Introductionmentioning

confidence: 99%

Two-dimensional theoretical model for design of burn-cut pattern

Mandal¹,

Singh²,

Dasgupta³

2007

Mining Technology

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Excavation methods for underground drivage should be cost effective and minimise damage to the periphery rock wall. Among the various methods of excavating systems the 'drill and blast' method is the most commonly used because of the low capital investment required, its easy manoeuvring and excavating capability and the flexibility of changing the excavation profile if ground conditions necessitate. The burn-cut method of blasting is cost effective and has a good advance rate compared to other conventional drilling patterns. This paper investigates how errors in the burn-cut method can be minimised and how the parameters influencing the progress per round of blast can be optimised. The importance of drilling accuracy, low burden and heavy charge concentration for the initial holes of the burn-cut method of blasting is discussed. This paper proposes a conceptual mathematical model to enable a better understanding of the burncut method of blasting. The model assumes that the process of breakage for the initial holes is a slabbing action and uses the concept of the deflection of a cantilevered beam (rock strata between charge and relief hole) to explain the importance of deeper relief holes. The results of an experimental study conducted in one of the tunnels in the Dul Hasti hydroelectric project in the Himalayan region are also discussed.

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Propagation of Peak Strain and Strain Energy From Explosion-Generated Strain Pulses in Rock1

Cited by 4 publications

References 0 publications

An equivalent spherical charge conversion (ESCC) approach for prediction of ground vibration due to blasting

An equivalent spherical charge conversion (ESCC) approach for prediction of ground vibration due to blasting

Blasting efficiency in granite aggregate quarry based on the combined effects of fragmentation and weighted environmental hazards

Two-dimensional theoretical model for design of burn-cut pattern

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