Endre søk
Begrens søket
12 1 - 50 of 63
RefereraExporteraLink til resultatlisten
Permanent link
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Treff pr side
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sortering
  • Standard (Relevans)
  • Forfatter A-Ø
  • Forfatter Ø-A
  • Tittel A-Ø
  • Tittel Ø-A
  • Type publikasjon A-Ø
  • Type publikasjon Ø-A
  • Eldste først
  • Nyeste først
  • Skapad (Eldste først)
  • Skapad (Nyeste først)
  • Senast uppdaterad (Eldste først)
  • Senast uppdaterad (Nyeste først)
  • Disputationsdatum (tidligste først)
  • Disputationsdatum (siste først)
  • Standard (Relevans)
  • Forfatter A-Ø
  • Forfatter Ø-A
  • Tittel A-Ø
  • Tittel Ø-A
  • Type publikasjon A-Ø
  • Type publikasjon Ø-A
  • Eldste først
  • Nyeste først
  • Skapad (Eldste først)
  • Skapad (Nyeste først)
  • Senast uppdaterad (Eldste først)
  • Senast uppdaterad (Nyeste først)
  • Disputationsdatum (tidligste først)
  • Disputationsdatum (siste først)
Merk
Maxantalet träffar du kan exportera från sökgränssnittet är 250. Vid större uttag använd dig av utsökningar.
  • 1.
    From, Tomas
    et al.
    Luleå tekniska universitet.
    Rustan, Agne
    Luleå tekniska universitet.
    Ekonomisk kalkyl av brytningsparametrar för forskningsgruvan i Luossavaara1980Rapport (Annet vitenskapelig)
  • 2.
    Holmberg, Roger
    et al.
    Swedish Detonic Research Foundation.
    Rustan, AgneLuleå tekniska universitet.
    First international symposium on rock fragmentation by blasting: August 23-26, 1983, Luleå university of technology1983Collection/Antologi (Annet vitenskapelig)
  • 3.
    Johansson, Bo
    et al.
    Luleå tekniska universitet, Institutionen för ekonomi, teknik och samhälle, Arbetsvetenskap.
    Rustan, Agne
    Luleå tekniska universitet.
    Risker med spränggaser vid grovhålsbrytning under jord: förstudie1987Rapport (Annet vitenskapelig)
  • 4.
    Kou, Shaoquan
    et al.
    Luleå tekniska universitet.
    Rustan, Agne
    Luleå tekniska universitet.
    SAROBLAST: a computer program for blast design, prediction of fragment size and muckpile profile1992Rapport (Annet vitenskapelig)
  • 5. Kou, S-Q
    et al.
    Rustan, Agne
    Luleå tekniska universitet.
    Burden related to blasthole diameter in rock blasting1992Inngår i: International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, ISSN 0148-9062, E-ISSN 1879-2073, Vol. 29, nr 6, s. 543-553Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Since the 1950s, most of the empirical formulas in rock blasting have incorporated a linear relation between burden and blasthole diameter. Recently it has been shown that a non-linear relation is more accurate for blasthole diameters in 40-400 mm range. This relation is different for surface and underground mines. In this paper, a complete relation between burden and either blasthole diameter or specific charge is established. This relation is based on energy conservation in single hole blast and consists of three terms which are related to surface energy for the two side cracks, fragmentation for the rock prism released and energy needed to move the rock. Four approximate formulas describing burden as a power function of the blasthole diameter are derived from the complete relation and dimensional analysis. The exponents of the diameter in the formulas are 2, 1, 5/6 and 2/3 and these decrease with the increasing scale in blasting. The coefficients of the power formulas are expressed as functions of the physical properties of the rock and explosive. The linear relation, derived as a special case with comparatively small blasthole diameters, is in a good agreement with Langefors' well-known formula. The valid ranges of the new formulas depend on the rock properties. The formulas were tested against the regression curves from real values in surface and underground mines and the results were better than those obtained using empirical methods.

  • 6.
    Naarttijärvi, Torbjörn
    et al.
    Luleå tekniska universitet.
    Nordlund, Michael
    Luleå tekniska universitet.
    Rustan, Agne
    Luleå tekniska universitet.
    Ludvig, Bengt
    Luleå tekniska universitet.
    Fältförsök med försiktig sprängning1980Rapport (Annet vitenskapelig)
  • 7.
    Naarttijärvi, Torbjörn
    et al.
    Luleå tekniska universitet.
    Rustan, Agne
    Luleå tekniska universitet.
    Öqvist, Jan
    Luleå tekniska universitet.
    Ludvig, Bengt
    Luleå tekniska universitet.
    Laboratorieförsök i försiktig sprängning1980Rapport (Annet vitenskapelig)
  • 8.
    Naarttijärvi, Torbjörn
    et al.
    Luleå tekniska universitet.
    Rustan, Agne
    Luleå tekniska universitet.
    Öqvist, Jan
    Luleå tekniska universitet.
    Ludvig, Bengt
    Luleå tekniska universitet.
    Styrd sprickbildning genom riktad sprängverkan: förstudie1980Rapport (Annet vitenskapelig)
  • 9.
    Rustan, Agne
    Luleå tekniska universitet.
    Analys av grovhålsborrad stigort vid sprängning i en salva1989Rapport (Annet vitenskapelig)
  • 10.
    Rustan, Agne
    Luleå tekniska universitet.
    Automatic image processing and analysis of rock fragmentation: comparison of systems and new guidelines for testing the systems1998Inngår i: Fragblast, ISSN 1385-514X, E-ISSN 1744-4977, Vol. 2, nr 1, s. 15-23Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The development of an automatic image processing and analysis system for rock fragmentation was started in Lulea in the beginning of the 1980's and the result was presented at Fragblast 1 (First International Symposium on Rock Fragmentation by Blasting) in Lulea in 1983. Since that, many countries like; Australia, Canada, France, Germany and USA have started their own development of automatic image processing and analysis systems. The ISRM Commission on Fragmentation by Blasting found that the time had come to make a state of the art report of the technique and the former ISRM President John Franklin was asked to arrange a workshop in connection to Fragblast 5 in Montreal in co-operation with Takis Katsabanis from Queens University, Ontario, Canada. Some principal data from Automatic image processing and analysis systems presented at the workshop are collected and compared in this paper. Also strategic issues regarding fragmentation analysis and the presentation of fragment size distributions, which were posted by the author of this paper in the poster session at Fragblast 5, are discussed after getting feed back from the participants. A proposal for an international testing procedure of the accuracy of the automatic image processing and analysis systems is presented.

  • 11.
    Rustan, Agne
    Luleå tekniska universitet.
    Befintliga driftsrekommendationer vid försiktig sprängning av orter och tunnlar1979Rapport (Annet vitenskapelig)
  • 12.
    Rustan, Agne
    Luleå tekniska universitet.
    Bergsprängningskommittén: diskussionsmötet 19781978Inngår i: JkA: Jernkontorets Annaler, ISSN 0280-4239, Vol. 162, nr 2, s. 28-30Artikkel i tidsskrift (Annet vitenskapelig)
  • 13.
    Rustan, Agne
    Luleå tekniska universitet.
    Bergsprängningsteknik: modern initieringsteknik, datorkoder för beräkning av styckefall och mätmetoder för laboratorie- och fältförsök i sprängning1982Rapport (Annet vitenskapelig)
  • 14.
    Rustan, Agne
    Luleå tekniska universitet.
    Blasting against fill in rill mining: Part 1: literature rewiew1990Rapport (Annet vitenskapelig)
  • 15.
    Rustan, Agne
    Luleå tekniska universitet.
    Borrnings- och sprängningsplaner för produktionssalvor i Luossavaara1980Rapport (Annet vitenskapelig)
  • 16.
    Rustan, Agne
    Luleå tekniska universitet.
    Burden, spacing and borehole diameter at rock blasting1992Inngår i: International Journal of Mining, Reclamation and Environment, ISSN 1748-0930, E-ISSN 1748-0949, Vol. 6, nr 3, s. 141-149Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Most text books on rock blasting claim that the relationship between burden and borehole diameter is linear. The statistical calculation presented here with real values from one hundred open pit and underground mines indicates that the relationship follows a power function. For underground mines the burdens are consistently lower than those for open pit mines because of higher ore densities, greater confinement in blasting, and finally greater demand for well fragmented rock. The results shown in this paper are recommended to be considered in basic teaching of rock blasting technique. The formulas can be used for a first rough estimation of practical burden and spacing. The formulas do not however give any information about the fragmentation. For that purpose it is necessary to use other formulas not described in this paper.

  • 17.
    Rustan, Agne
    Luleå tekniska universitet.
    Controlled contour blasting of rock: a literature review concerning methods of blasting, theory, and blasting control1990Rapport (Annet vitenskapelig)
  • 18.
    Rustan, Agne
    Luleå tekniska universitet.
    Controlled fragmentation and contours in rock blasting: theoretical and technical approaches1995Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    The Swedish mining and construction industries have a large interest in improving blasting technology, in milling concerning rock fragmentation by blasting (especially underground in large diameter hole blasting, > 100 mm) and in construction and mining concerning controlled and safe contours in blasted tunnels. This doctoral thesis deals with these matters and includes a licentiate thesis (published in 1970) and five papers A-E included in the doctoral thesis and published during 1983 to 1992. The licentiate thesis (in Swedish) presents the development of a method to determine the ore content in an LHD-bucket after loading iron ore in the mine. The method is based on measuring the bulk density of the ore-waste mixture. In order to investigate the accuracy of the method a theoretical model was established, and verified by model-scale blasting tests and research concerning fragmentation and swelling of blasted ore under varying technical and environmental conditions. Paper A describes a part of the licentiate thesis, the development and choice of a suitable model material for the blasting tests. Controlled Contour Blasting Technique (Paper B) especially in tunnelling, needs improvement in bad rock. Literature studies and model and full-scale tests were the base for the evaluation of the existing and proposed contour blasting methods. Controlled Rock Fragmentation (Paper C, D, and E) is an important goal, especially in large hole diameter blasting. New design formulas were therefore developed for mean fragment size, rock fragment size distribution, etc. in connection with technical parameters such as burden or specific charge, spacing and rock impedance. The formulas are based on literature studies and model and flill-scale tests. A new relation between the burden and blasthole diameter was derived from statistical analysis of data from one hundred surface and underground mines. The relation is different for surface and underground mines.

  • 19.
    Rustan, Agne
    Luleå tekniska universitet.
    Diskussionsdag i styrd gruvventilation 8 oktober 1986 vid Tekniska Högskolan i Luleå1987Rapport (Annet vitenskapelig)
  • 20.
    Rustan, Agne
    Luleå tekniska universitet.
    Framtidens kontursprängningsmetod, skärsprängning kombinerad med riktad sprängverkan?1981Rapport (Annet vitenskapelig)
  • 21.
    Rustan, Agne
    Luleå tekniska universitet.
    Gaps in the field of fragmentation by blasting and some thoughts about future research and development1983Inngår i: First international symposium on rock fragmentation by blasting, August 23-26, 1983, Luleå university of technology / [ed] Roger Holmberg; Agne Rustan, Luleå: Luleå tekniska universitet, 1983, Vol. 3, s. 827-837Konferansepaper (Fagfellevurdert)
  • 22.
    Rustan, Agne
    Luleå tekniska universitet.
    Gravity flow of broken rock: What is known and unknown2000Inngår i: MassMin 2000: 29 October - 2 November 2000, Brisbane, Queensland, Carlton, Victoria: The Australasian Institute of Mining and Metallurgy, 2000, s. 557-568Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The knowledge in the field has been reviewed by literature studies, and using experience from personal research in sublevel caving. There is a lot of material regarding gravity flow of fine grained materials in bins, but the theory of flow for these materials are normally not applicable for coarse blasted rock. This study was therefore concentrated towards coarse rock fragments created after blasting in orebodies. The goal for this study was to make a report of known knowledge, and identify what we have to learn more about. The Bergmark-Roos theory, which was a paradigm shift in the science of gravity flow, is today the best mathematical theory for calculation of the drawbody for a homogenous material or when we wish to simulate the mean drawbody for a large number of draws. The Bergmark-Roos theory must however be improved, so it can take into account the flow pipe effect. When this is done it will be possible to construct a 3D computer model for calculation of ore extraction versus amount of loaded ore and waste. It is also necessary to find the 3D shape of the flow cone to be able to calculate the 3D ore rest that normally develops on footwalls. Calculations should be done for the draw on several sublevels including determination of the ore losses and temporary ore rests. First when this computer model is developed optimisation of ore recovery and waste rock dilution can start for a given orebody. The author points out the importance for international co-operation and standardisation of methods for determination of material properties. More field tests and model blasting tests should also be done. When enough knowledge is gathered, a handbook of the optimisation of sublevel and block caving should be written

  • 23.
    Rustan, Agne
    Luleå tekniska universitet.
    Gruvventilation, strålning och aerosoler under jord1982Rapport (Annet vitenskapelig)
  • 24.
    Rustan, Agne
    Luleå tekniska universitet.
    Importance of using joints to achieve scaled fragmentation in magnetite concrete used for sublevel caving blast models1990Inngår i: Engineering Fracture Mechanics, ISSN 0013-7944, E-ISSN 1873-7315, Vol. 35, nr 1-3, s. 425-438Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Model scale tests have been undertaken to find a model material which can give scaled fragmentation in sublevel caving blast models where the purpose is to study the swelling and fragmentation of the burden when blasted against waste rock and also to study the gravity flow of the blasted burden when being discharged into the drift. To achieve a wished Rosin Rammler distribution of the blasted material in the blasted model, it was shown necessary to introduce weakness plans of different size and stochastic orientation in the model material. Crushed microscopic glass plates or coarse magnetite grains were used for that purpose with success

  • 25.
    Rustan, Agne
    Luleå tekniska universitet.
    Instrumenterad bergbult1978Inngår i: JkA: Jernkontorets Annaler, ISSN 0280-4239, Vol. 162, nr 1, s. 30-32Artikkel i tidsskrift (Annet vitenskapelig)
  • 26.
    Rustan, Agne
    Luleå tekniska universitet.
    Kartering av orsaker till sprängningsproblem i skivrasbrytning samt skivbrytning med återfyllning: förstudie1987Rapport (Annet vitenskapelig)
  • 27.
    Rustan, Agne
    Luleå tekniska universitet.
    Linear shaped charges for contour blasting or stone cutting: full scale tests at Gårdlidenberget, Storsund1983Rapport (Annet vitenskapelig)
  • 28.
    Rustan, Agne
    Luleå tekniska universitet.
    Massbrytning vid flacka liggväggar1992Rapport (Annet vitenskapelig)
  • 29.
    Rustan, Agne
    Luleå tekniska universitet.
    Micro-sequential contour blasting: how does it influence the surrounding rock mass?1998Inngår i: Engineering Geology, ISSN 0013-7952, E-ISSN 1872-6917, Vol. 49, nr 3-4, s. 303-313Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The optimal delay time between the contour holes in rock blasting has been studied by theoretical and empirical research in Sweden, regarding ground vibrations, increase in crack frequency, radial crack length and finally overbreak (half cast factor). The model test presented in this paper concerns controlled contour blasting in tunnelling and the full-scale blasts concern tunnelling, road cutting, and dimensional stone quarrying. The results indicate that the microsequential contour blasting technique (contour holes fired in sequence and with a delay in the order of 1-2 ms) is superior to simultaneous initiation both regarding blast-induced ground vibrations and crack frequency increase in the rock mass. Both these evaluation methods reflects the conditions deeper in the remaining rock mass. Simultaneous initiation, however, is superior to micro-sequential contour blasting both regarding the half cast factor and the length of radial cracks emanating from the blastholes. These two parameters are more related to the surface conditions after blasting. The industrial applications of this new knowledge are the use of micro-sequential contour blasting when ground vibrations are of greater concern than the contour, for example, in trench blasting or quarrying in urban areas, and the use of simultaneous initiation when an even rock surface is of high priority.

  • 30.
    Rustan, Agne
    Luleå tekniska universitet.
    Optimal delay time between decked charges in blastholes1984Rapport (Annet vitenskapelig)
  • 31.
    Rustan, Agne
    Luleå tekniska universitet.
    Punktutsugning av dieselavgaser under jord: förstudie1981Rapport (Annet vitenskapelig)
  • 32.
    Rustan, Agne
    Luleå tekniska universitet.
    Rock blasting terms and symbols: a dictionary of symbols and terms in rock blasting and related areas like drilling, mining and rock mechanics1998Collection/Antologi (Annet vitenskapelig)
  • 33.
    Rustan, Agne
    Luleå tekniska universitet.
    Strategies and database for testing fragmentation formulas in rock blasting1993Rapport (Annet vitenskapelig)
  • 34.
    Rustan, Agne
    Luleå tekniska universitet.
    Styckefallspåverkande faktorer vid bergsprängning: litteraturstudie1981Rapport (Annet vitenskapelig)
  • 35.
    Rustan, Agne
    Luleå tekniska universitet.
    Styrd gruvventilation i Europa (England, Frankrike, Belgien, Tyskland och Polen): Reserapport 17-26 maj 19781978Rapport (Annet vitenskapelig)
  • 36.
    Rustan, Agne
    Luleå tekniska universitet.
    Styrd ventilation genom mätning av gashalt eller dammkoncentration inklusive kontinuerlig miljöövervakning: Etapp 1: Mätstrategi - förstudie och projektförslag för etapp 21983Rapport (Annet vitenskapelig)
  • 37. Rustan, Agne
    Tunnel- och gruvventilation för Gb 4, Gb 5, Gb 15 och Gb 131978Rapport (Annet vitenskapelig)
  • 38.
    Rustan, Agne
    Luleå tekniska universitet.
    Ventilation av tvärort med kombinerad sug-blåsfläkt vid eldriven hjullastning1991Rapport (Annet vitenskapelig)
  • 39.
    Rustan, Agne
    Luleå tekniska universitet.
    Vibrationer och sprickbildning runt sprängborrhål: Litteraturstudie1978Rapport (Annet vitenskapelig)
  • 40.
    Rustan, Agne
    Luleå tekniska universitet.
    Volymviktmetodens teoretiska grunder för bestämning av malmhalt hos en blandning av sprängd malm och gråberg: kinematik, svällning, uppluckring, och styckefall i försättningen vid sprängning mot löst berg i pall- och skivrasmodeller1980Licentiatavhandling, med artikler (Annet vitenskapelig)
  • 41.
    Rustan, Agne
    et al.
    Luleå tekniska universitet.
    Adolfsson, Janerik
    Luleå tekniska universitet.
    Bomsalvor och dolor: en kartläggning av omfattning och orsaker med exempel på åtgärder1976Rapport (Annet vitenskapelig)
  • 42.
    Rustan, Agne
    et al.
    Luleå tekniska universitet.
    Bergqvist, Ingvar
    Persson, Algot
    Bergets rörelse och uppsprickning vid pallsprängning1988Rapport (Annet vitenskapelig)
  • 43.
    Rustan, Agne
    et al.
    Luleå tekniska universitet.
    Deng, Junhua
    Luleå tekniska universitet.
    Öqvist, Jan
    Luleå tekniska universitet.
    Spränggasöverströmning i sprickor mellan borrhål med risk för detonationsavbrott: litteraturstudier samt kvantifiering av sprickförbindelser mellan spränghål med vattenförlustmätning1994Rapport (Annet vitenskapelig)
  • 44.
    Rustan, Agne
    et al.
    Luleå tekniska universitet.
    Harlin, Gösta
    Styrd ventilation genom fläktreglering baserad på fordonslägeskontroll1981Rapport (Annet vitenskapelig)
  • 45. Rustan, Agne
    et al.
    Kumar, B.R.
    Critical analysis of problems related to blasting of hard and massive steel grey hematite occurring at Bailadila Deposit No. 5 Mine, India1996Inngår i: Mine planning and equipment selection 1996: proceedings of the Fifth International Symposium on Mine Planning and Equipment Selection, São Paulo, Brazil, 22-25 October 1996 / [ed] Wildor Theodoro Hennies, Rotterdam: Balkema Publishers, A.A. / Taylor & Francis The Netherlands , 1996, s. 425-Konferansepaper (Fagfellevurdert)
  • 46.
    Rustan, Agne
    et al.
    Luleå tekniska universitet.
    Kumar, R.
    National Mineral Development Corp.
    Laboratory scale single hole blastability test in blue grey and steel grey hematite from Bailadila Mine, India2000Inngår i: Fragblast, ISSN 1385-514X, E-ISSN 1744-4977, Vol. 4, nr 1, s. 35-53Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In the Bailadila hematite mine in India, we can find one of the worlds most difficult ore to blast due to the high density- and high longitudinal wave velocity of the hematite ore. The product of these two physical parameters is called acoustic impedance (Z). For the Bailadila Blue grey- and Steel grey hematite ore, Z was found to vary between 24-33·106 kg/m2s. This range of Z is much higher than all rock materials tested so far by Lulea University of Technology, where the range was between Z = 12-20·106 kg/m2s. The hematite, in the blocks tested, had many pores and in full scale cavities also called 'blow holes' could be found at the mine. These pores in the model blocks may influence the breakout in tests. In the model blocks there were also some irregular weakness planes found. The main problem in the Bailadila Mine was too many boulders, especially when blasting in the Blue grey hematite ore. Lab. scale single hole blasting tests were undertaken in hematite blocks with the dimension 100×300×300 mm at Lulea University of Technology to determine the blastability of the two most common types of hematite occurring at Bailadila, Blue grey- and Steel grey hematite. The data were compared to already known results from earlier lab. single hole blast tests in hard rocks. The measured critical burdens for the Bailadila ore were very small because of the high acoustic impedance. This means that the ore is very difficult to blast, in fact the most difficult to blast of all rock and rocklike materials so far tested at Lulea University of Technology. Based on the state of the art of blasting technology today the best explosive to use in the Bailadila hematite would therefore be an explosive with high density and detonation velocity. That would improve breakage and reduce the number of boulders. Other suggestions for improvement of fragmentation are to initiate each hole on a separate delay, increase the number of intersection holes and change the spacing/burden ratio.

  • 47.
    Rustan, Agne
    et al.
    Luleå tekniska universitet.
    Lin, Nie Shu
    Luleå tekniska universitet.
    Fragmentation model at rock blasting1987Rapport (Annet vitenskapelig)
  • 48.
    Rustan, Agne
    et al.
    Luleå tekniska universitet.
    Naarttijärvi, Torbjörn
    The influence from specific charge and geometric scale on fragmentation1983Rapport (Annet vitenskapelig)
  • 49.
    Rustan, Agne
    et al.
    Luleå tekniska universitet.
    Naarttijärvi, Torbjörn
    Luleå tekniska universitet.
    Ludvig, Bengt
    Luleå tekniska universitet.
    Controlled blasting in hard intense jointed rock in tunnels1985Inngår i: CIM bulletin, ISSN 0317-0926, E-ISSN 1718-4169, Vol. 78, nr 884, s. 63-68Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Full-scale tests have been done at LKAB in hard intense jointed magnetite ore. Four different types of perimeter charges have been tested: tube charges, ANFO mixed with plastic beads, detonating cord and linear-shaped charges. Three types of initiation of the perimeter holes have been used: conventional (half-second delay detonators), instantaneous and ultra short cutblasting initiation (1. 5 ms delay). Cutblasting with detonating cord in the perimeter holes gave the smallest damage to the surrounding rock. A new classification system for controlled blasting regarding the damage to the surrounding rock has been devised.

  • 50.
    Rustan, Agne
    et al.
    Luleå tekniska universitet.
    Nie, Shulin
    Luleå tekniska universitet.
    New method to test the rock breaking properties of explosives in full scale1992Inngår i: International Journal of Mining, Reclamation and Environment, ISSN 1748-0930, E-ISSN 1748-0949, Vol. 6, nr 4, s. 191-200Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    During our research it was found that, still today, the rock breaking properties of an explosive can not be accurately determined by laboratory test or theoretical calculations. The new test method proposed here for bench blasting is based on single hole blasts in model- and full scale with different burdens up to and greater than the critical burden. The tests in full scale should be done with that hole diameter, length of hole, explosive and stemming etc., desired to be used in the real operation. The new method includes determination of the fragment size distribution, the backbreak, the throw, the centre of gravity change and the damage to the remaining rock for each burden tested. This will yield the maximum information possible for understanding how the explosive interacts with the rock. The field tests to examine the single hole blasts were done at Storugns limestone quarry on Gotland, and the model blast tests at Lulea University of Technology. They showed that there exist a good correlation between the model- and full scale tests regarding the angle of breakage versus burden and the relation of k50 versus burden, where the function has the same shape, and finally the power for the specific charge is the same both in the model and full scale. Critical burden and fragmentation gradient are well correlated with the impedance of the rock in the model tests. It seems that the model test can reveal many of the rock breaking properties of an explosive in full scale. The test procedure used for the model and full scale test were therefore proposed as a first idea to an international standard. Based on the systematic investigation carried out at Storugns limestone quarry it was theoretically possible to increase the profit up to 8 million SEK/year by changing burden and spacing and thereby reducing the amount of fines (

12 1 - 50 of 63
RefereraExporteraLink til resultatlisten
Permanent link
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf