Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

Wyszukujesz frazę "blasting" wg kryterium: Temat


Tytuł:
Research review of the influence of millisecond delay on intensity and structure of vibrations induced with blasting works in Polish strip mines
Przegląd badań nad wpływem opóźnienia milisekundowego na intensywność i strukturę drgań wzbudzanych robotami strzałowymi w polskich kopalniach odkrywkowych
Autorzy:
Pyra, J.
Powiązania:
https://bibliotekanauki.pl/articles/348559.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
millisecond blasting
blasting works
ground vibration
odpalania milisekundowe
roboty strzałowe
drgania parasejsmiczne
Opis:
In the article research presented and results reviewed referring to the subject of the influence of millisecond delays on intensity and frequency structure of vibrations induced by blasting works in Polish strip mines of raw rock materials. It demonstrates how opinions have changed due to the new possibilities of inducing delay. The conclusions presented have taken many years to compile.
W artykule przedstawiono przegląd badań i ich wyniki na temat wpływu opóźnienia milisekundowego na intensywność i strukturę częstotliwościową drgań wzbudzanych robotami strzałowymi w polskich kopalniach odkrywkowych surowców skalnych. Ukazano, jak zmieniały się opinie wraz z nowymi możliwościami zadawania opóźnień i przedstawiono wnioski sformułowane na przestrzeni wielu lat.
Źródło:
AGH Journal of Mining and Geoengineering; 2013, 37, 1; 81-91
1732-6702
Pojawia się w:
AGH Journal of Mining and Geoengineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
Tytuł:
A model study to measure fragmentation by blasting
Autorzy:
Nefis, M.
Talhi, K.
Powiązania:
https://bibliotekanauki.pl/articles/972322.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Tematy:
FragScan
fragmentation
blasting
rock
explosive
Opis:
Accurate measurement of blast fragmentation is important in mining and quarrying operations, to monitor blasting and optimize blast design. A new digital photoanalytical method to measure the size of fragments by using FragScan system is presented here. Photographs of the broken rock are digitized, and individual measurement, based on mathematical morphology techniques, achieves, within successive openings on a binary image, a numerical sieving. The method was tested during recent full scale blasting tests in the case of open pit gold mine of Amesmessa (Algeria). It shows great potential as a practical aid to predicting, monitoring, and controlling the quality of the fragmented rock.
Źródło:
Mining Science; 2016, 23; 91-104
2300-9586
2353-5423
Pojawia się w:
Mining Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of air overpressure using bat algorithm
Autorzy:
Dehghani, Hesam
Ali Mohammad Nia, Farid
Powiązania:
https://bibliotekanauki.pl/articles/2016495.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Tematy:
metaheuristic
bat algorithm
air overpressure
blasting
Opis:
Air overpressure (AOp) is an undesirable phenomenon in blasting operations. Due to high potential to cause damage to nearby structures and to cause injuries, to personnel or animals, AOp is one of the most dangerous adverse effect of blasting. For controlling and decreasing the effect of this phenomenon, it is necessary to predict it. Because of multiplicity of effective parameters and complexity of interactions among these parameters, empirical methods may not be fully appropriate for AOp estimation. The scope of this study is to predict AOp induced by blasting through a novel approach based on the bat algorithm. For this purpose, the parameters of 62 blasting operations were accurately recorded and AOp were measured for each operation. In the next stage, a new empirical predictor was developed to predict AOp. The results clearly showed the superiority of the proposed bat algorithm model in comparison with the empirical approaches.
Źródło:
Mining Science; 2021, 28; 77-92
2300-9586
2353-5423
Pojawia się w:
Mining Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Explosive Charge Diameter on the Detonation Velocity Based on Emulinit 7L and 8L Bulk Emulsion Explosives
Autorzy:
Mertuszka, P.
Cenian, B.
Kramarczyk, B.
Pytel, W.
Powiązania:
https://bibliotekanauki.pl/articles/358708.pdf
Data publikacji:
2018
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
blasting works
explosives
velocity of detonation
Opis:
One of the main parameters describing the properties of explosives is the velocity of detonation, which can be defined as the propagation speed of the chemical reaction zone in the detonating explosive. The detonation velocity of an explosive depends on many parameters, such as the material’s density or diameter and the shell of an explosive, plus the degree of crystal fragmentation, the initiation method and the content of particular components. The effectiveness of blasting work in underground mines depends primarily on the proper selection of the hole diameter, hole length, the distance between the holes and the delays of the detonators used. This article presents the results of studies investigating the influence of the diameter of a bulk emulsion explosive charge on the detonation velocity using a MicroTrapTM VOD/Data Recorder manufactured by MREL, Canada. The underground tests were developed in the “Polkowice-Sieroszowice” copper mine in Poland.
Źródło:
Central European Journal of Energetic Materials; 2018, 15, 2; 351-363
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Control and documentation studies of the impact of blasting on buildings in the surroundings of open pit mines
Autorzy:
Sołtys, A.
Twardosz, M.
Winzer, J.
Powiązania:
https://bibliotekanauki.pl/articles/92130.pdf
Data publikacji:
2017
Wydawca:
Główny Instytut Górnictwa
Tematy:
mining
blasting works
millisecond blasting technique
ground borne vibration
górnictwo
technika strzelnicza
strzelanie milisekundowe
minimalizacja drgań
Opis:
Environmental Protection Law together with Geological and Mining Law impose on a mining plant a duty to protect its surroundings against the effects of mining operations. It also refers to the impact of vibrations on people and buildings induced by blasting works. Effective protection is possible only if the actual level of the impact is known, hence it has to be recorded. It was and still is the keynote idea of the research conducted at the AGH Laboratory of Blasting and Environmental Protection. The effect of many years of research is the development of an original and, in particular, an effective procedure to record the impact of blasting works with periodical measurements of vibration intensity or monitoring the vibrations' impact on buildings in the surrounding area. These assumptions form part of preventive actions taken by open pit mines, which are aimed at minimizing the impact of blast workings on the surroundings and are often recommended by experts. This article presents the course of action concerning control tests of vibration intensity in the surroundings of a mine. It also shows it is necessary to monitor vibrations in buildings as it is a source of knowledge for the mining plant management personnel and engineers who conduct blasting works, thus contributing to an increase in awareness of the responsible management of a mining plant. The Vibration Monitoring Station (KSMD) developed by a research group, after several upgrades, has become a fully automated system for monitoring and recording the impact of blast workings on the surroundings. Moreover, it should be emphasised that without the mine management personnel's cooperation, it would be impossible to work and achieve the common goal, i.e. conducting blasting works in a way that is safe for the surroundings.
Źródło:
Journal of Sustainable Mining; 2017, 16, 4; 179-188
2300-1364
2300-3960
Pojawia się w:
Journal of Sustainable Mining
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of the Influence of Sensitizer Content on the Density of a Bulk Emulsion Explosive Used in Underground Operations
Autorzy:
Kramarczyk, Bartłomiej
Mertuszka, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/27787941.pdf
Data publikacji:
2021
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
blasting
emulsion explosives
density measurements
chemical sensitization
Opis:
Emulsion matrix sensitization is typically performed by chemical reduction of the density using different sensitization agents. Mixing of the components takes place directly inside the loading hose, which is equipped with static mixing devices. Precise dosing of the components, due to the multi-ingredient nature of the mixture, has a significant impact on the detonation and operational parameters of the end product. However, the operation and maintenance of the mixing-charging units in underground mines is very difficult due to the local conditions. As a consequence, different values for the detonation parameters may be expected when charging the same explosive into blastholes using two different charging units. The present article presents the results of laboratory testing of the influence of the sensitizing agent content on the density of a bulk emulsion explosive. Analysis confirmed that increasing the concentration of the sensitizing agent by 30% and 50% led to density reductions by 4% and 7%, respectively. In turn, reducing the sensitizer content by the same percentages resulted in an increase in the final density by 7% and 8%, respectively.
Źródło:
Central European Journal of Energetic Materials; 2021, 18, 4; 429--447
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of parameters of grit blasting conducted Dymet® device 412K to obtain roughness
Autorzy:
Szyfelbain, M.
Charchalis, A.
Starosta, M.
Powiązania:
https://bibliotekanauki.pl/articles/244066.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
roughness
blasting
Dymet® 412K gun
alumina
Opis:
There are several fundamental steps for the technological preparation, which are required to optimize the thermal spray coatings. In order to ensure proper bonding of the coating, important is properly preparation of substrate. The surface of the substrate has to be clean and should have a suitable roughness after previously performed treatment. Knowledge about the effects of process parameters allows designing the coatings obtained with an optimal adherence. Only when all the components of the spraying coating process are used correctly there is possible properly design the technology. The article describes the impact of technological parameters of grit blasting to obtain the roughness of the steel substrate (steel S185) to the process of metallic coatings by cold gas dynamic spraying. Research was carried out by using the Dymet® 412K appliance, designed for applying metal coatings and substrate surface cleaning. Grit blasting is a mechanical method of surface preparation of metal parts. It allows obtaining a high degree of surface cleanliness and a determined roughness. The authors took into account parameters such as operational pressure, spray angle (incidence) of abrasive grit blasting in the axis of the stream and feed rate of used abrasive particles (Al2O3) passed to the nozzle of spray gun. Carried out the multiple regression analysis of the roughness parameters results. It revealed the existence of certain influences and changes of process parameters, which affect on the surface quality. Carried out calculations by using a multiple regression showed that the greatest correlation is between the required roughness and the feed rate of used abrasive particles. The studied roughness was described by the parameters: Ra, Rz, Rt and RSm. Stepped growth (from 0.1 to 0.8 g/s) of abrasive particles feed rate caused a decline of all of the roughness parameters. It has been found that the values of the roughness in the least depend on the operational pressure.
Źródło:
Journal of KONES; 2016, 23, 4; 521-526
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Firing Explosive Charges with Millisecond Delay in Surface Mining – Historical Outline
Autorzy:
Sołtys, A.
Powiązania:
https://bibliotekanauki.pl/articles/317848.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
roboty strzałowe
odpalanie milisekundowe
oddziaływanie drgań
systemy inicjowania w robotach strzałowych
blasting works
millisecond blasting technique
ground-borne vibration
Opis:
Blasting works conducted in surface mines with large explosive charges are associated with the problem of unfavourable influence of vibrations, induced by detonating the charges, on structures in the vicinity of the mines. Applying explosives to mine deposits also influences effectiveness of blasting works, associated with fragmentation of rocks. Since the beginning of the 1950s, explosive charges are most often fired with millisecond delays. The article presents the historical outline of research into millisecond firing with electric, non-electric and electronic systems, conducted in surface mines in Poland and around the world. As a result of the works, it was concluded that the interval and precision of set millisecond delays signifi-cantly influence intensity of vibrations induced by detonating explosive charges, and fragmen-tation of rocks. In electrical systems the actual firing times of detonators may significantly differ from their nominal times, hence there is a risk of overlapping delay times and, as a re-sult, a risk of increasing intensity of vibrations. Researchers indicate that maintaining specified time interval between detonations of consecutive explosive charges may successfully limit the seismic effect. It was the reason behind introducing “8 millisecond criterion” into the practice of blasting works in 1960s, as the minimal delay time between consecutively fired charges. With technical progress in initiation systems, precision of set delays significantly improved, as electronic initiation systems show it. The research conducted with the system clearly shows that the commonly assumed minimal 8 ms time does not have to be a binding rule any more. Precision of state-of-art electronic detonators successfully enables designing multiple row fir-ing patterns, with minimal delay time shorter than 8 ms between consecutively fired charges.
Wykonywanie w kopalniach odkrywkowych robót strzałowych z zastosowaniem dużych mas materiałów wybuchowych wiąże się z problemem niekorzystnego oddziaływania drgań, wzbudzanych detonacją ładunków, na zabudowania w otoczeniu kopalń. Stosowanie materiałów wybuchowych w procesie urabiania złóż wpływa również na efektywność robót strzałowych, związaną z granulacją urobku. Od początku lat 50., ładunki materiałów wybuchowych odpalane są najczęściej milisekundowo. W artykule przedstawiono rys historyczny badań w zakresie odpalania milisekundowego z zastosowaniem systemów elektrycznych, nieelektrycznych i elektronicznych, prowadzonych w kopalniach odkrywkowych zarówno w Polsce jak i na świecie. W efekcie tych prac stwierdzono, że interwał i precyzja zadawanych opóźnień milisekundowych mają istotny wpływ na intensywność drgań indukowanych detonacją ładunków MW, jak i na stopień rozdrobnienia urobku. W przypadku elektrycznego systemu inicjowania rzeczywiste czasy detonacji zapalników mogą się znacznie różnić o czasów nominalnych, stąd istnieje ryzyko nakładania się czasów opóźnień a tym samym może nastąpić wzmocnienie intensywności drgań. Autorzy badań wskazują, że zachowanie określonego odstępu czasowego między detonacją kolejnych ładunków materiałów wybuchowych może skutecznie ograniczać efekt sejsmiczny. To było przyczyną wprowadzenia w latach 60. ubiegłego wieku do praktyki wykonywania robót strzałowych „kryterium 8 milisekund”, jako minimalnego czasu opóźnienia pomiędzy kolejno odpalanymi ładunkami. W miarę postępu technicznego systemów inicjowania, precyzja zadawanych opóźnień uległa znacznej poprawie, czego dowodem jest elektroniczny system inicjowania. Jednocześnie badania z zastosowaniem tego systemu wyraźnie wskazują, że powszechnie przyjęty w praktyce minimalny czas 8 ms nie musi już być obowiązującą regułą. Precyzja nowoczesnych zapalników elektronicznych z powodzeniem umożliwia projektowanie wieloszeregowych siatek strzałowych, z minimalnym czasem opóźnienia mniejszym niż 8 ms pomiędzy kolejno odpalanymi ładunkami.
Źródło:
Inżynieria Mineralna; 2018, R. 20, nr 2, 2; 177-190
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Increasing the country’s security and public transport accessibility by creating a network of small airports
Autorzy:
Mieloszyk, Eligiusz
Milewska, Anita
Wyroślak, Mariusz
Powiązania:
https://bibliotekanauki.pl/articles/93220.pdf
Data publikacji:
2018
Wydawca:
Akademia Sztuki Wojennej
Tematy:
country security
blasting charges
camouflet explosion
runway
Opis:
It has been shown that by creating a network of small airports, it is possible to increase the communication accessibility of large population groups and the country’s security, including safety at sea. The airports mentioned above may also be located on land considered to be weak from an engineering point of view. This includes, for example, wetlands, swamps, flood embankments, poor coastal belt grounds, and reclaimed land. A quick and effective method of adapting the aforementioned land for locating airport infrastructure on has been put forward. It is a method for reinforcing the ground with blasting agents. This method can be successfully used in all conditions. In combat conditions, it can be used for quick construction of spare airports, additional runways and reconstruction of damaged runways. It can also be used to create a dispersed network of airports and airstrips, which is important not only from the military point of view, but also from the civil.
Źródło:
Zeszyty Naukowe Akademii Sztuki Wojennej; 2018, 4(113); 49-60
2543-6937
Pojawia się w:
Zeszyty Naukowe Akademii Sztuki Wojennej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on the milisecond delay blasting impact in order to minimize seismic effects in Kučín quarry surrounding
Autorzy:
Baulovič, J.
Pandula, B.
Kondela, J.
Powiązania:
https://bibliotekanauki.pl/articles/92731.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
blasting operations
seismic effect
particle velocity
seismic safety
Opis:
The intensity of seismic waves’ vibrations is proportional to the weight of the applied explosive. If the vibrations are sufficientin energy, surrounding buildings can be damaged or destroyed. Evaluating the negative effects of the blasting operations and quantification of the seismic safety is nowadays very actual and a challenging problem. The article presents the results of the analysis as well as an evaluation on seismic safety of the objects during blasting in the quarry Kučín. The results the evaluation seismic effects blasting verified in a Kučín quarry are the methodological base for evaluating the seismic effects of blasting in all quarries in Slovakia.
Źródło:
Materiały Wysokoenergetyczne; 2015, T. 7; 5-13
2083-0165
Pojawia się w:
Materiały Wysokoenergetyczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monitoring the impact of blasting operations on the environment – new solutions
Monitorowanie oddziaływania robót strzałowych na otoczenie – nowe rozwiązania
Autorzy:
Pyra, Józef
Sołtys, Anna
Winzer, Jan
Powiązania:
https://bibliotekanauki.pl/articles/1065142.pdf
Data publikacji:
2019
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
vibration monitoring
blasting works
monitoring drgań
roboty strzałowe
Opis:
Roboty strzałowe prowadzone w kopalniach odkrywkowych surowców skalnych wzbudzają drgania, które mogą powodować szkodliwe oddziaływanie na obiekty budowlane w otoczeniu. W związku z powyższym kopalnie prowadzą działania skierowane z jednej strony na wyznaczenie warunków bezpiecznego dla otoczenia wykonywania robót strzałowych, a z drugiej strony na dokumentowanie poziomu tego oddziaływania. Dokumentowanie oddziaływania przez cykliczne pomiary kontrolne i oceny oddziaływania mają zasadniczą wadę w postaci okresowej ich realizacji. Ta słaba strona pomiarów kontrolnych jest całkowicie niwelowana przez monitoring oddziaływania. W Polsce do monitorowania oddziaływania robót strzałowych na otoczenie stosowany jest system Kopalniana Stacja Monitoringu Drgań (KSMD), który został zaprojektowany i zbudowany w Akademii Górniczo-Hutniczej w Krakowie. System ten w czasie kilku lat uległ modernizacji i unowocześnieniu. Aktualnie jest to zdalnie sterowany system z zastosowaniem łączności przez Internet, dane pomiarowe gromadzone są na centralnym serwerze w AGH. W artykule przedstawiono ewolucję systemu z podkreśleniem aktualnych jego możliwości.
Źródło:
Materiały Wysokoenergetyczne; 2019, 11, 1; 56-65
2083-0165
Pojawia się w:
Materiały Wysokoenergetyczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Time on the Density and Detonation Velocity of Bulk Emulsion Explosives – a Case Study from Polish Copper Mines
Autorzy:
Mertuszka, Piotr
Fuławka, Krzysztof
Pytlik, Mateusz
Wincenciak, Jarosław
Wawryszewicz, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/358802.pdf
Data publikacji:
2019
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
blasting
emulsion explosives
VOD
density measurements
chemical gassing
Opis:
The basic method for emulsion matrix sensitisation is chemical reduction of the density by producing in situ gas bubbles. The mixing of the components takes place directly inside the loading hose, which is equipped with a mixing device. Due to the multi-component nature of the mixture, the precise dosing of individual components has a key influence on the detonation behaviour of the final product. Unfortunately, keeping the mixing and charging of UG mobile units in good working condition in underground mines is a considerable challenge. As a result, completely different detonation parameters may be observed when charging the same explosive into blast holes using two different units. The aim of the present study was to determine the behaviour of the mechanically loaded emulsion explosives used in Polish underground copper mines by tracking the changes in the density and detonation velocity over time. Samples of the explosives were collected from selected mobile units. In addition, the influence of the quantity of the sensitising agent on the changes in the emulsion density and VOD was studied.
Źródło:
Central European Journal of Energetic Materials; 2019, 16, 2; 245-258
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of positive elevation effect and prediction of vibration velocity of bench blasting vibration
Autorzy:
Zhang, X. J.
An, H. M.
Powiązania:
https://bibliotekanauki.pl/articles/1853676.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
drgania wybuchowe
efekt podniesienia pozytywny
formuła kroku
strzał
kopalnia
blasting vibration
positive elevation effect
step formula
mine
blasting
Opis:
Accurate prediction of blasting vibration should be achieved in mine blasting production practice. It is also a critical problem in the field of blasting vibration control technology research. In this research paper, on the basis of the previous research results and taking account into the reflection principle of elastic wave at the free interface, the authours proposes the blasting seismic wave propagation model. In addition, the blasting positive elevation effect are theoretically explained in detail, and the vibration velocity prediction formula of the positive elevation effect is derived. Finally, the positive elevation effect mechanism and the step (positive) formula are calibrated based on the on-site monitoring data of blasting vibration of Qipanjing Jinou coal mine. In beirf, a theoretical basis is laid by this paper for similar blasting projects.
Źródło:
Archives of Civil Engineering; 2021, 67, 1; 599-618
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Examination of Wetting by Liquid Zinc of Steel Sheets Following Various Kinds of Abrasive Blasting
Autorzy:
Cecotka, M.
Dybowski, K.
Klimek, L.
Lipa, S.
Rylski, A.
Sankowski, D.
Wojciechowski, R.
Bąkała, M.
Powiązania:
https://bibliotekanauki.pl/articles/352820.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
abrasive blasting
dip zinc coating
surface preparation
wettability
Opis:
Abrasive blasting is one of the methods of surface working before hot-dip zinc-coating. It allows not only to remove products of corrosion from the surface, but it also affects the quality of the zinc coating applied later, thereby affecting wettability of surface being zinc-coated. The surface working can be done with different types of abrasive material. The paper presents an effect of the method of abrasive blasting on wetting the surface of steel sheets by liquid zinc. Steels sheets following blasting with Al2O3 of different granularity and shot peening were examined. The worst wetting was recorded for a sample following shot peening - the results are below those for the reference test conducted for a sample not previously subjected to any treatment. Samples following abrasive blasting have similar parameters, regardless of the size of grain used for the treatment.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2B; 1069-1074
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies