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Упит dcterms_subject_txt:rock breakage by explosives

893 items

  • Estimating extent and properties of blast-damaged zone around underground excavations

    Slavko Torbica, Veljko Lapčević (2015)
    Tunneling in hard rock, rock blasting, blast-damaged zone, rock breakage by explosives

  • Fragmenting of cylindrical rock specimens under explosive load: Comparison between model and laboratory results

    Slavko Torbica, Veljko Lapcevic (2016)
    rock fragmentation, rock breakage by explosives, fragmentation model, laboratory tests, blasting

  • Rock breakage by explosives

    Torbica Slavko, Lapčević Veljko (2014)

  • Simpson's rule application for experimental determining parameters of rock mass oscillation equation at limestone

    Suzana Lutovac, Miloš Gligorić, Jelena Majstorović, Branko Gluščević, Luka Crnogorac (2021)
    By its form, the use of explosives has a destructive character. However, energy of chemical explosives is tamed and perfected in many effects, so that is developed a series of activities which work is unthinkable without the use of explosives. In mining industry, explosives are most commonly used for exploitation in hard rock mass. Thereby, large amounts of explosives can be used, especially for mass blasting. The application of large amounts of explosives gives auspicious techno – economic indicators ...
    working environment, seismic effects of blasting, oscillation velocity, rock mass oscillation equation, Simpson’s rule

  • Analiza seizmičkog dejstva eksplozije pri miniranju na primeru izrade tunela Golubac kod Golupca

    Suzana Lutovac, Miloš Gligorić, Jelena Majstorović, Luka Crnogorac (2022)
    Savremeno rudarstvo, a pogotovo masovna eksploatacija metaličnih ležišta, ne bi se mogla zamisliti bez primene eksploziva. Rudarstvo je privredna grana, gde su eksplozivi našli najširu primenu za eksploataciju čvrstih mineralnih sirovina. Primena energije eksploziva dovodi do poboljšanja tehničkoekonomskih pokazatelja pri eksploataciji mineralnih sirovina, ali i do pojave negativnih efekata koji prate radove na miniranju. Eksplozivni materijali u rudarstvu, geologiji i drugim delatnostima, svojim dejstvom narušavaju prirodnu sredinu u vidu drobljenja, razbacivanja komada stene, vazdušnih udara, pojave sezmičkih efekata, pojave ...
    miniranje, seizmičko dejstvo, brzina oscilovanja stenske mase, kriterijumi ocene seizmičkog dejstva

  • Flyrock induced by blasting in surface mining

    Milanka Negovanović, Lazar Kričak, Snežana Ignjatović, Stefan Milanović, Jovan Marković, Nikola Simić, Rade Šarac (2022)
    Miniranje predstavlja i dalje najefikasniji i najjeftiniji način eksploatacije velikih količina čvrstih mineralnih sirovina na površinskim kopovima. Energija eksplozije se koristi za fragmentaciju čvrste stenske mase do zahtevane granulacije. Pored pozitivnih efekata miniranja, postoje i određeni neželjeni efekti svakog procesa miniranja koji se mogu javiti, a to su: potresi tla, razletanje komada stene, vazdušni udari, otrovni i zagušljivi gasovi i prašina. Razletanje komada stene je nekontrolisano izbacivanje fragmenata odminirane stenske mase i predstavlja jedan od glavnih izvora materijalne štete ...
    razletanje, bušenje, miniranje, površinska eksploatacija, bezbednost, nesreća

  • Split-Desktop software for the analysis of fragment size distribution of blasted rock mass

    Milanka Negovanović, Lazar Kričak, Stefan Milanović, Jovan Marković, Nikola Simić, Snežana Ignjatović (2023)
    Drobljenje stena je najvažniji pokazatelj u proceni efekata miniranja pri proizvodnom miniranju u površinskoj eksploataciji. Stepen drobljenja stena ima veliki uticaj na efikasnost daljih operacija utovara, transporta, drobljenja i mlevenja. Optimalno drobljenje stena pri proizvodnom miniranju utiče na smanjenje ukupnih troškova proizvodnje. Stoga je pouzdana procena veličine drobljenja odminirane stenske mase veoma važno pitanje, ne samo u operacijama miniranja, već i u rudarskoj proizvodnji. Za predviđanje distribucije veličine komada odminirane stenske mase postoje različiti empirijski modeli. KUZ-RAM model omogućava ...
    Split-Desktop softver, drobljenje stena, miniranje, analiza, digitalna obrada fotografija

  • Analysis of a simplified model for determining rock mass oscillation velocity at the Kovilovača open pit

    Suzana Lutovac, Miloš Gligorić, Jelena Majstorović, Luka Crnogorac (2023)
    ... Parameters K and m are conditioned by } v characteristics of the rock mass and blasting conditions. Thus, V is a decreasing and convex function of the variable R. By applying the equation of rock mass oscillation while blasting, the determination of the rock mass oscillation velocity is made ...
    ... magnitude of shock. 196 2. RECORDING ROCK MASS OSCILLATION VELOCITY Intensity of the shock is measured by instruments — seizmographs. Measuring of the rock mass oscillation velocity needed for this paper has been done by the instrument type Vibraloc, produced by the Swedish firm ABEM. From seismograph ...
    ... between the rock mass oscillation velocity and consequences that can affect facilities, is used. The equation of M.A Sadovskii [4] is given in the form: r v=K·R"'=K-·-| —| ; (3) [3@] where there are: v — rock mass oscillation velocity [cm / s] K - coefficient conditioned by rock mass chara ...

  • Sequential Blasting Initiation System with Wireless RF Control (SBIS - WRF)

    Kričak Lazar, Bogunović Dragan, Teodorović Zoran (2008)

  • Modeling an artificial screen for reducing seismic vibration generated from blasting

    Bogunović Dragan, Kričak Lazar, Kecojević Vladislav (2007)

  • Experimental determination of best performing cut in Lece underground mine

    Slavko Torbica, Miodrag Duranović, Nenad Gramić, Veljko Lapčević, Miloš Čolović (2020)
    blasting, explosives, underground mining

  • Constitutive Model for Analysis of Long-Term Municipal Solid Waste Landfill Settlement

    Irena Basarić Ikodinović, Dragoslav Rakić, Mirjana Vukićević, Sanja Jocković, Jovana Janković Pantić (2022)
    Large long-term settlement occurs at the municipal solid waste landfills over an extended period of time which may lead to breakage of the geomembrane, damage of the cover systems, other protective systems or facilities constructed on top of a landfill. Also, municipal solid waste is an extremely heterogeneous material and its properties vary over location and time within a landfill. These material characteristics require the formulation of a new constitutive model to predict the long-term settlement of municipal solid ...
    constitutive model, finite element analysis, municipal solid waste, settlement

  • Adaptive neuro-fuzzy prediction of operation of the bucket wheel drive based on wear of cutting elements

    Filip Miletić, Predrag D. Jovančić, Milos Milovančević, Dragan Ignjatović (2020)
    The capacity of the rotor excavator depends largely on the operation of the subsystem for digging. There is a great contribution to the correct and sharp teeth when the capacity is the highest. In the function of time, the teeth become clogged due to abrasive wear, or changes in their geometric shape. To analyze the bucket wheel drive in depend on wear of the cutting elements in this study adaptive neuro fuzzy inference system (ANFIS) approach was implemented. ANFIS ...
    Pogon rotornog točka, habanje, rezni elementi, ANFIS

  • Composition of organic matter and thermal maturity of Mesozoic and Cenozoic sedimentary rocks in East Herzegovina (External Dinarides, Bosnia and Herzegovina)

    Nikoleta Aleksić, Aleksandar Kostić, Miloš Radonjić (2021)
    This paper presents the first data on the organic matter and thermal maturity of Mesozoic and Cenozoic sedimentary rocks in the East Herzegovina region of the External Dinarides. Representative, organic-rich samples from outcropping sedimentary rocks of different ages in the area (Triassic to Neogene) were selected and analysed. The organic matter was studied by Rock-Eval pyrolysis and under the microscope in reflected non-polarized light and incident blue light. The results obtained show the presence of different types of organic ...
    nafta i gas, Rock-Eval, refleksija vitrinita, maceral, termička zrelost
    ... petroleum system. �ermal maturity was studied by means of Rock-Eval pyrolysis and vitrinite re�ectance measurements. GEOLOGICAL SETTING �e Dinarides are located in the central area of the Mediterranean system of orogens (Fig. 1A). �eir evolution was determined by the collisional processes of large-scale ...
    ... petroleum system. Thermal maturity was studied by means of Rock-Eval pyrolysis and vitrinite reflectance measurements. GEOLOGICAL SETTING The Dinarides are located in the central area of the Mediterranean system of orogens (Fig. 1A). Their evolution was determined by the collisional processes of large-scale ...
    ... Empirical conversions between vitrinite re�ectance and T max were published by Teichmüller and Durand (1983) and Tissot et al. (1987). RESULTS AND INTERPRETATION Rock-Eval pyrolysis analyses �e main output parameters of Rock-Eval pyrolysis, in- cluding maturity parameter T max,x , are shown in Tables ...

  • Soil oscillation law parameter determination with the application of Lagrange’s theorem at “Kovilovača“ open pit

    Suzana Lutovac, Nebojša Vidanović, Čedomir Beljić, Zoran Gligorić (2015)
    ... model 2 In the rock mass oscillation velocity law given by equation (4) in the form: n RKv (4) parameter n can be determined by succes- sive approximations applying the Lagran- ge’s theorem 8 . If rock mass oscillation velocity law giv- en in equation (4) we differentiate by R, the following ...
    ... blasted mass requires the use of large amounts of explosives, leading to an increase in the negative effects of mining. Under negative effects of mining the seismic effect of blasting, effect of air waves, sound effect, scattering the blasted rock mass, and similar are assumed. In order both to ...
    ... With regard to the characteristics of the rock mass oscilla- tion law, it is possible to determine the pa- rameters K and n in a number of ways, i.e. models, thereby using the values obtained by experimental measurements. ♦ Determination of parameters by model 1 The smallest square method is ...

  • Preparation of Multimedia Document “YU Rock Scene”

    Milena Obradović, Aleksandra Arsenijević, Mihailo Škorić (2017)
    SUMMARY: This study will present the preparation process of a multimedia document entitled YU ROCK SCENE in which participants were senior students of undergraduate studies of the Department of Library and Information Science at the University of Belgrade Faculty of Philology during the academic year 2014/2015, as a part of the subject Multimedia Documents. This study gives an overview of the historical development of rock and roll in the territory of the former Yugoslavia, rock scene in Yugoslav republics, ...
    multimedia document, library science, information science, rock and roll, music, Yugoslavia
    ... development of rock music in Macedonia and breakthrough of young and unrecognized rock bands by broadcasting music from the territory of the Former Yugoslavia and the world- famous rock hits of the time. 2.6 YU Rock Scene in Montenegro Out of all countries of the former Yugoslavia, rock music was least ...
    ... directed by Vladimir Popović, Ljubav i moda (1960) by Ljubomir Radičević and Zvǐzduk u osam (1962) by Sava Mrmak. In movies Kad budem mrtav i beo (1967) directed by Živojin Pavlović and Nemirni (1969) directed by Kokan Rakonjac, owing to groups such as Elipse, Zlatni dečaci and Siluete, rock music ...
    ... present. In the 1980s, mixture of rock music and movies reached its peak in the movies Davitelj protiv davitelja (1984) directed by Slobodan Šijan, Dečko koji obećava (1980) by Miloš Radivojević, Crna Marija (1986) by Milan Živković and Šest dana juna (1985) directed by Dinko Tucaković. Kornelije ...

  • Some models for determination of parameters of the soil oscillation law during blasting operations

    Suzana Lutovac, Dragan Medenica, Branko Gluščević, Rade Tokalić, Čedomir Beljić (2018)
    ... r0 . Thus, we have obtained the oscillation law of rock mass, i.e., the equation of Sadovskii. 2.1.2. Derivation of Equation of Rock Mass Oscillation—Second Mode Here we give one more mode to derive the equation for the rock mass oscillation. If, by blasting in the specific environment, the relative ...
    ... point r, reduced to the used explosive amount Q. K and n parameters conditioned by soil characteristics and blasting conditions, thereby v is the decreasing convex function of the variable R. By applying the law of rock mass oscillation while blasting, the determination of the soil oscillation velocity ...
    ... ¨ dR R , where by integration is obtained: ż dv v “ ´n ¨ ż dR R , namely: logv “ logR´n ` logC (9) C—represents constant of integration. Equation (9) can be written in the form: logv “ logC ¨ R´n (10) If in the previous equation C is replaced by K, C = K, then we get the rock mass oscillation ...

  • Blast-induced damage and its impact on structural stability of underground excavations

    Slavko Torbica, Veljko Lapcevic (2017)
    Tunneling in hard rock, rock blasting, key block theory, rock wedges

  • Parameter determination of soil oscillation law using quotient of the relative growth increments of oscillation velocity and reduced distances at “Nepričava“ open pit mine

    Suzana Lutovac, Sanja Bajić, Marina Ravilić, Radmila Gaćina (2015)
    ... environment and by particular blasting conditions. With regard to the characteristics of the rock mass oscillation law, it is possible to determine the parameters K and n in a number of ways, i.e. models, thereby using values obtained by experimental measurements. Determination of parameters by model 1 ...
    ... monitoring point m, Q - amount of explosive kg. 2.1. Derivation of equation of rock mass oscillation law If, by blasting in the specific environment, the relative increase in the oscillation velocity of the rock mass and the relative increase of the reduced distance are monitored, then it can ...
    ... can be used for calculating of the oscillation velocity of the rock mass. ACKNOWLEDGEMENT This paper has resulted from the Project No.33025 and No.33029 financed by the Ministry of Education of the Republic of Serbia realized by the Faculty of Mining and Geology in Belgrade. ...

  • Models of Determining the Parameters of Rock Mass Oscillation Equation with Experimental and Mass Blastings

    Suzana Lutovac, Branko Gluščević, Rade Tokalić, Jelena Majstorović, Čedomir Beljić (2018)
    ... distance, the quantity of explosives, blasting conditions and geological characteristics of the rock mass, and it is determined based on trial blasting for a specific work environment. Thus, this paper offers analysis of the method for determination of parameters of the rock mass oscillation equation ...
    ... Abstract: The explosion caused by detonation of explosive materials is followed by release of a large amount of energy. Whereby, a greater part of energy is used for rock destruction, and part of energy, in the form of seismic wave, is lost in the rock mass causing rock mass oscillation. Investigations ...
    ... The main parts of a seismograph are sensors—geophones by way of which rock mass oscillation velocity is being recorded. Measuring of the rock mass oscillation velocity needed for this paper has been done by the instrument type Vibraloc, produced by the Swedish firm ABEM. Detector for detecting oscillation ...