Collected Item: “Analysis of the Influence of Burden Deviation from the Designed One on the Intensity of the Blast Vibration”
Врста публикације
Рад у часопису
Верзија рада
објављена верзија
Језик рада
енглески
Аутор/и (Милан Марковић, Никола Николић)
Stefan Milanović, Lazar Kričak, Milanka Negovanović, Nikola Simić, Jovan Marković, Nikola Đokić
Наслов рада (Наслов - поднаслов)
Analysis of the Influence of Burden Deviation from the Designed One on the Intensity of the Blast Vibration
Наслов часописа
Applied Sciences
Издавач (Београд : Просвета)
MDPI AG
Година издавања
2023
Сажетак на енглеском језику
This paper presents an analysis of the influence of burden deviation from the designed
one on the intensity of blasting vibrations through the use of laboratory and field examinations. By
definition, the burden represents the shortest distance from the axis of an explosive column charge to
the free surface. It should be measured along the entire hole length, although, in practice, it is often
measured only on the bench surface as the shortest distance from the axis of the explosive column
charge to the crest. The real surface of the bench slope (free face) can be very irregular and should
be considered during every blast. The deviation of burden in the blast pattern represents a serious
problem in the field during blasting operation. Burden deviation from the designed one can be
greater or lesser, affecting the results of blasting through poor fragmentation and sometimes causes
unwanted effects like increased blasting vibrations or fly rock. The influence of burden deviation on
the intensity of blasting vibrations was tested on a laboratory model, where 8 mm diameter holes
were drilled into blocks with certain dimensions. The small explosive charges placed in blastholes
were initiated. The design burden was set at 30 mm, as the distance from blastholes to the free face of
the blocks. Any deviation in distance greater than the designed burden was taken as a parameter
for comparison. During each initiation, vibrations were measured using a seismic instrument at a
distance of 150 mm from the borehole. At the same time, the free face in the front of the blastholes
was photographed to create a detailed 3D model of the blasted surface of the blocks for each blasting.
Each measurement is presented on a diagram and classified depending on the values of the burden
in the cases where the value of the burden is equal to the designed one, as well as any deviation that
is smaller or larger than 30 mm. A total of 55 tests were carried out. The results were analyzed, and
the model of dependence of each burden deviation from the designed one on the intensity of blasting
vibrations was established under laboratory conditions. To verify the model, the same experiments
were also applied in the field. The basic parameter of the model, the coefficient K, which represents
the ratio of peak particle velocity and the surfaces of the blasted material from laboratory and field
testing, indicates that there is a connection between these values. The deviation of the coefficient K,
obtained from laboratory and field measurements, was 5.5%.
one on the intensity of blasting vibrations through the use of laboratory and field examinations. By
definition, the burden represents the shortest distance from the axis of an explosive column charge to
the free surface. It should be measured along the entire hole length, although, in practice, it is often
measured only on the bench surface as the shortest distance from the axis of the explosive column
charge to the crest. The real surface of the bench slope (free face) can be very irregular and should
be considered during every blast. The deviation of burden in the blast pattern represents a serious
problem in the field during blasting operation. Burden deviation from the designed one can be
greater or lesser, affecting the results of blasting through poor fragmentation and sometimes causes
unwanted effects like increased blasting vibrations or fly rock. The influence of burden deviation on
the intensity of blasting vibrations was tested on a laboratory model, where 8 mm diameter holes
were drilled into blocks with certain dimensions. The small explosive charges placed in blastholes
were initiated. The design burden was set at 30 mm, as the distance from blastholes to the free face of
the blocks. Any deviation in distance greater than the designed burden was taken as a parameter
for comparison. During each initiation, vibrations were measured using a seismic instrument at a
distance of 150 mm from the borehole. At the same time, the free face in the front of the blastholes
was photographed to create a detailed 3D model of the blasted surface of the blocks for each blasting.
Each measurement is presented on a diagram and classified depending on the values of the burden
in the cases where the value of the burden is equal to the designed one, as well as any deviation that
is smaller or larger than 30 mm. A total of 55 tests were carried out. The results were analyzed, and
the model of dependence of each burden deviation from the designed one on the intensity of blasting
vibrations was established under laboratory conditions. To verify the model, the same experiments
were also applied in the field. The basic parameter of the model, the coefficient K, which represents
the ratio of peak particle velocity and the surfaces of the blasted material from laboratory and field
testing, indicates that there is a connection between these values. The deviation of the coefficient K,
obtained from laboratory and field measurements, was 5.5%.
Волумен/том или годиште часописа
13
Број часописа
23
Укупан број страна рада (уколико не постоји пагинација)
20
DOI број
10.3390/app132312837
ISSN број часописа
2076-3417
Кључне речи на српском (одвојене знаком ", ")
linija najmanjeg otpora, 3D model, miniranje, potresi usled miniranja, slobodna površina
Кључне речи на енглеском (одвојене знаком ", ")
burden, 3D model, blasting, blast vibration, free face
Линк
https://www.mdpi.com/2076-3417/13/23/12837/pdf
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М22
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TR33003
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