Method for studying the structure of blast-induced vibrations in open-cast mines

Pyra, J.; Sołtys, A.

doi:10.21595/jve.2016.17052

Cited by 7 publications

(6 citation statements)

References 2 publications

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“…The most relevant and reliable data on the structure of recorded vibrations can now be captured using Matching Pursuit (MP) (Durka, 2004;Mallat & Zhang, 1993;Pyra & Sołtys, 2016;Sołtys et al, 2017), the latest algorithm for analysing frequency changes over time, based on an iterative matching of signal to a set of functions, where at each stage of the approximation, part of the signal to which a function has been matched, is removed and other functions are compared to the rest of the signal. This makes it possible to avoid unnecessary repeated processing of the same parts of the signal.…”

Section: Using Matching Pursuit To Examine Vibration Structurementioning

confidence: 99%

Archives of Mining Sciences

Sołtys

2020

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Detonation of explosives creates strong para-seismic vibrations. Such vibrations can damage buildings or other infrastructure located in the vicinity of such detonations, and can be burdensome to people living in such areas. This paper describes the usefulness of Matching Pursuit (MP) algorithm in assessing the impact of blasting on the surrounding areas, and proves that by taking into account frequency changes over time, vibration analysis can help make much more profound and reliable predictions in this field.

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Section: Using Matching Pursuit To Examine Vibration Structurementioning

confidence: 99%

Archives of Mining Sciences

Sołtys

2020

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“…Other interesting aspects of blasting using the technique of modeling and optimizing the process from technological and economical points of view can be found in many works. The issues of millisecond delays as well vibration structure are discussed in [59][60][61][62][63][64][65].…”

Section: Introductionmentioning

confidence: 99%

An Evaluation on the Impact of Ore Fragmented by Blasting on Mining Performance

et al. 2022

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In open-pit mines, the blast operation should be effectively optimized, leading to minimization of production costs through the application of specific technical specifications. However, there is inadequate information in the literature to link blasting to comminution stages. To this end, the effective parameters for the performance of mining unit operations were scrutinized in this work. In this regard, the rock fragmentation distribution (RFD) caused by blasting was considered the main determinative criterion for providing the optimum conditions for the blasting operation at Sarcheshmeh copper mine. By carrying out a statistical analysis of the experimental data, operational parameters affecting the blasting were optimized. The relationship between parameters was obtained using the technique of regression and in accordance with the evaluation criterion under which correlation coefficient (R2) was used to determine the best fitting model. A high correlation coefficient of the loading cycle of the machine’s bucket (Cl) with the independent variables showed that the C1 was more affected by the RFD, as well as the dimensions of the blast block. Because of the wide variations in the nature and structure of rock mass in different mines, in each case, sufficient data should be collected, and these relationships should be analyzed statistically for each individual mine showing wide ranges of fractures and cracks. Therefore, due to these wide variations of ore characteristics, with the current data it seems very difficult to quickly find a significant operational relationship between downstream processes such as crushing efficiency and blasting operations. Therefore, the focus of this research was limited to the effective parameters for blast efficiency. According to the analysis of the data obtained from 20 blasts under different operating conditions, the diameter of the hole was 241.3 mm (such as blast number 20), the ratio of length to width of the explosive block was about 6 (average blasts with high fragmentation efficiency), and the best index of mining operations was 0.22 (such as blast number 20).

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“…The issue of the impact of vibrations induced by the detonation of EM on the environment is widely discussed around the world. More and more new analytical methods [1] and numerical modelling [2][3][4][5] techniques are used to accurately predict the intensity of vibrations at a given point and the way they are transferred to building objects. Similarly, research on the impact of AB is focused on interaction in close proximity to detonation place and is carried out for military purposes.…”

Section: Introductionmentioning

confidence: 99%

Vibroacoustic measurements and analysis of blasting works

Pyra¹,

Kłaczyński²

2019

J. vibroeng.

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Blasting works cause short-term high-energy shock waves-acoustic, air (airblast) and paraseismic. The duration of the event can be up to 2-3 seconds, while the rise time to the peak value is directly related to the delay between the individual explosive material (EM) and the firing sequence and ranges from a few to several milliseconds. Their propagation in the environment can affect people, animals and construction structures located not only in the close but also further distance from their source. If EM is placed on the surface of the earth during the detonation, the shock wave spreads evenly in all directions in the half-space, and when the detonation follows in rock, the wave usually travels in one direction and is accompanied by a paraseismic wave. However, the sound heard when detonating is part of the wave spectrum in the band from 20 to 20000 Hz, while the airblast itself has a frequency of less than 20 Hz. Since at some distance from the detonated EM, the parameters of the airblast are close to the parameters of the acoustic wave, the method of spreading the acoustic wave depends to a great extent on atmospheric conditions, i.e. density, temperature and humidity of the air, and from wind speed and its direction. To get to know the essence of the phenomenon of the impact of blasting works, measurements are carried out considering the propagation conditions, i.e. meteorological conditions as well as vibration analysis in the ground itself and on the building substructure. This paper presents the results of research carried out by the Authors in terms of the correct assessment of the impact range (acoustic, airblast, paraseismic waves) during EM detonation placed on the surface.

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Method for studying the structure of blast-induced vibrations in open-cast mines

Cited by 7 publications

References 2 publications

Archives of Mining Sciences

Archives of Mining Sciences

An Evaluation on the Impact of Ore Fragmented by Blasting on Mining Performance

Vibroacoustic measurements and analysis of blasting works

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