Temat: strzałowy - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Obliczenie optymalnej średnicy otworu strzałowego z uwzględnieniem właściwości wytrzymałościowych i akustycznych urabianej skały oraz energii zastosowanego materiału wybuchowego (MW)
Calculation of the optimum blast hole diameter, taking into account the strength and acoustic properties of the excavated rock and the energy of the BM used
Autorzy:: Chrzan, Tadeusz
Powiązania:: https://bibliotekanauki.pl/articles/31342951.pdf
Data publikacji:: 2023
Wydawca:: Poltegor-Instytut Instytut Górnictwa Odkrywkowego
Tematy:: średnica optymalna
otwór strzałowy
obliczenia
optimum diameter
blast-hole
calculations
Opis:: Artykuł dotyczy nowego sposobu obliczenia optymalnej średnicy otworu strzałowego. Sposób ten uwzględnia właściwości wytrzymałościowe i akustyczne urabianej skały oraz energię zastosowanego MW. Przedstawiono stan obecny doboru średnicy otworów strzałowych. Na podstawie przykładów, które odzwierciadlają rzeczywiste warunki wytrzymałościowe i akustyczne urabianej w złożu bazaltu i dolomitu skały przeprowadzono obliczenia. Obliczenia te wykazały, że błąd względny określenia stosowanej średnicy w stosunku do optymalnej wynosi od -2% do+6,6%. Tak duża dokładność określenia średnicy optymalnej potwierdza prawidłowość zastosowanej zależności, która może być stosowana w praktyce.
The article deals with a new method of calculating the optimum diameter of a blast hole. This method takes into account the strength and acoustic properties of the rock being excavated and the energy of the BM used. The current status of the selection of blasthole diameters is presented. Calculations were carried out using examples that reflect the actual strength and acoustic conditions of the rock being excavated in basalt and dolomite deposits. These calculations showed that the relative error in the determination of the diameter used in relation to the optimum diameter ranges from -2% to+6.6%. This high accuracy in determining the optimum diameter confirms the validity of the relationship used, which can be applied in practice.
Źródło:: Górnictwo Odkrywkowe; 2023, 64, 1; 13-17
0043-2075
Pojawia się w:: Górnictwo Odkrywkowe
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Prediction of blast-induced ground vibration using gene expression programming (GEP), artificial neural networks (ANNS), and linear multivariate regression (LMR)
Autorzy:: Shakeri, Jamshid
Shokri, Behshad Jodeiri
Dehghani, Hesam
Powiązania:: https://bibliotekanauki.pl/articles/219872.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: strzałowy
wibracje podłoża
kopalnia miedzi Sarcheshmeh
blasting
ground vibration
gene expression programming
linear multivariate regression
Sarcheshmeh copper mine
Opis:: In this paper, an attempt was made to find out two empirical relationships incorporating linear mul-tivariate regression (LMR) and gene expression programming (GEP) for predicting the blast-induced ground vibration (BIGV) at the Sarcheshmeh copper mine in south of Iran. For this purpose, five types of effective parameters in the blasting operation including the distance from the blasting block, the burden, the spacing, the specific charge, and the charge per delay were considered as the input data while the output parameter was the BIGV. The correlation coefficient and root mean squared error for the LMR were 0.70 and 3.18 respectively, while the values for the GEP were 0.91 and 2.67 respectively. Also, for evaluating the validation of these two methods, a feed-forward artificial neural network (ANN) with a 5-20-1 structure has been used for predicting the BIGV. Comparisons of these parameters revealed that both methods successfully suggested two empirical relationships for predicting the BIGV in the case study. However, the GEP was found to be more reliable and more reasonable.
Źródło:: Archives of Mining Sciences; 2020, 65, 2; 317-335
0860-7001
Pojawia się w:: Archives of Mining Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Numerical modelling of destress blasting – a state-of-the-art review
Autorzy:: Miao, Shuting
Konicek, Petr
Pan, Peng-Zhi
Mitri, Hani
Powiązania:: https://bibliotekanauki.pl/articles/2201422.pdf
Data publikacji:: 2022
Wydawca:: Główny Instytut Górnictwa
Tematy:: de-stress blasting
numerical modelling
blasting process
rock mass fracturing
destress blasting design
odprężanie
modelowanie numeryczne
proces strzałowy
szczelinowanie górotworu
projektowanie odprężania
Opis:: As a proactive mine safety measure against the occurrence of rockburst, destress blasting has been applied to numerous mining conditions to precondition highly stressed rock mass to mitigate the risk of rockburst occurrence in deep mines as well as in deep underground constructions. However, the application of destress blasting mostly depends on engineering experience, while its mechanism and efficiency have not been well understood. Rapid advances in computer technology have made numerical simulation an economical and effective method to study the rock blasting effect. Enormous research efforts have been made to numerically investigate the blasting fracture mechanism, optimize blasting design, and assess the efﬁciency of destress blasting. This review focuses on the state-of-the-art progress in numerical modelling associated with destress blasting over the last two decades. Some commonly used modelling approaches for destressing blasting are compared and reviewed. Currently, two different ways of modelling based on static and dynamic modes are typically used to study the effect of blasting. In the static method, destress blasting is simulated by modifying the rock mass’s stiffness and strength properties to obtain the post-blast stress state in the destressed zone. The dynamic modelling technique focuses on the dynamic fracture process of coals and rock masses, during which the predetermination of the damage induced by blasting is not necessary. Moreover, the extent of damage zones around the blast hole can be precisely estimated in the dynamic modelling method by considering time-varying blast pressure and strain rate dependency on the strength of rock mass but at the cost of increased computation and complexity. Besides, different destress blasting modelling methods, generally classified into continuum-based, discrete-based, and coupled methods, are compared and reviewed. The fracture mechanism of blasting in the rock mass is revealed, and the destressing efficiency of the existing destress blasting design is assessed and compared with classical results. The factors that may affect the efficiency of destress blasting are summarized. Finally, the difficulties and challenges associated with the numerical modelling of destress blasting are highlighted briefly.
Źródło:: Journal of Sustainable Mining; 2022, 21, 4; 278--297
2300-1364
2300-3960
Pojawia się w:: Journal of Sustainable Mining
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Study of rock fracture under blast loading
Autorzy:: Baranowski, Paweł
Kucewicz, Michał
Pytlik, Mateusz
Małachowski, Jerzy
Powiązania:: https://bibliotekanauki.pl/articles/2173700.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Johnson-Holmquist II model
JH-2
rock
blasting
fracture
small-scale testing
model Johnsona-Holmquista II
głazy
strzałowy
pęknięcie
test na małą skalę
Opis:: A study of dolomite rock material failure using a simple small-scale blast setup is presented. Laboratory tests were conducted using disc specimens drilled with a borehole in the center. A detonation cord and a blasting cap were fitted inside the borehole to induce cracking and fracturing of the specimens. The specimens were inserted between two steel plates, which were compressed against the specimen using bolt screws. Prior to testing, the most suitable screw torque for constraining the vertical displacement of the specimen surfaces without compressing the specimen was selected based on numerical simulations. Then, the experimental tests with the blasting cap were simulated using the Johnson–Holmquist II (JH-2) material model, and the properties of the blasting cap were determined and verified in two special tests with a lead specimen. Possessing the validated model, the influence of specimen thickness on the cracking patterns was finally analyzed. This paper presents a relatively easy method for studying rock material behavior under blast loading and for validating the numerical and constitutive models used for rock simulations.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 5; art. no. e141723
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

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