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264 items
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Uniaxial compressive strength test before and after standard fire test on rock mass
Stefan Mitrović, Goran Todorović, Bojan Kostić, Milica Mirković-Marjanović, Nikola Božović, Marija Krstić, Aleksandar Erić, Radovan Gospavić, Snežana Ilić, Aleksandar Kijanović (2022)... It depends on the structure of the rock mass, grain size and orientation, number and arrangement of cracks and fissures. For the same rock, strength may be different, depending on physical characteristics. Heat of environment can affect structure of rock mass, which results in a change in uniaxial ...
... uniaxial compressive strength of rock after fire. Uniaxial compressive strength is an important parameter of rock material in the field of rock mechanics. It is the basic parameter for determining strength and classification of rock mass. It is determined experimentally, by laboratory strength ...
... study was to examine the uniaxial compressive strength of the rock, before and after standard fire test on the rock mass. The paper presents the strengths of the specimens tested before and after standard fire test. KEYWORDS Rock; Uniaxial compressive strength; Standard fire test. ...Stefan Mitrović, Goran Todorović, Bojan Kostić, Milica Mirković-Marjanović, Nikola Božović, Marija Krstić, Aleksandar Erić, Radovan Gospavić, Snežana Ilić, Aleksandar Kijanović. "Uniaxial compressive strength test before and after standard fire test on rock mass" in Fifth symposium of the Macedonian Association for Geotechnics, Ohrid, North Macedonia, 23-25. 06. 2022, Macedonian Association for Geotechnics (2022)
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Развој модела конструкције просторија отварања рудника са подземном експлоатацијом
Dražana M. Tošić (2016-08-26)Приликом израде подземних просторија у стјенској маси долази до нарушавања природне равнотеже напонских стања стијенског масива који су владали прије израде тих просторија, при чему долази до појаве прертасподјеле напона и његове концентрације у појединим правцима и тачкама, односно долази до појаве пластичних деформација које су праћене ломљењем стијенске масе и кретањима материјала према откопаном простору...модел, метод коначних елемената, просторија отварања, напон, дефеормација стијенског масива, алгоритам функционалних зависностиDražana M. Tošić. "Развој модела конструкције просторија отварања рудника са подземном експлоатацијом" in Универзитет у Београду, Универзитет у Београду, Рударско-геолошки факултет (2016-08-26)
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Parameter determination of soil oscillation law using quotient of the relative growth increments of oscillation velocity and reduced distances at “Nepričava“ open pit mine
... crushes rock mass, a bit further creates cracks and permanent deformations in the rock mass, and even further it is being transformed into elastic deformations. The effect of elastic seismic wave is movement of particles of the rock mass from its equilibrium position. Such oscillation of the rock mass ...
... 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 be ...
... To establish the relationship between the oscillation velocity of the rock mass and basic parameters affecting its magnitude, being: the amount of explosive, the distance from the blast site, characteristics of the rock mass and the type of blasting, it is the equation of M. A. Sadovski that is ...Suzana Lutovac, Sanja Bajić, Marina Ravilić, Radmila Gaćina. "Parameter determination of soil oscillation law using quotient of the relative growth increments of oscillation velocity and reduced distances at “Nepričava“ open pit mine" in Underground Mining Engineering, Belgrade : University of Belgrade, Faculty of Mining and Geology (2015). https://doi.org/10.5937/podrad1526009L
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The influence of alkyl polyglucosides (and highly ethoxylated alcohol boosters) on the phase behavior of a water/toluene/technical alkyl polyethoxylate microemulsion system
Marija Ilic, Franz-Hubert Haegel, Vesna Pavelkic, Dragan Zlatanovic, Snezana Nikolic-Mandic, Aleksandar Lolic, Zoran Nedic (2016)The influence of additives (alkyl polyglucoside, Glucopon 600 CS UP and alcohol ethoxylate C18E100) on the behavior of the water/toluene/Lutensol ON 50 (technical oxoalcohol, i-C10E5) microemulsion system as a function of temperature and composition has been investigated. The phase behavior of the microemulsions was determined by vertical sections through the Gibbs phase prism (fish-like phase diagrams). Alkyl polyglucoside shifts the one phase region to lower temperatures compared with water/toluene/Lutensol ON 50 mixtures. This is contrary to the expectation, considering ...микроемулзија, толуен, алкил полиглукозид, оксоалкохол етоксилат, појачивач ефикасности, „fish“ дијаграми... constant oil/water ratio as a function of temperature, 7, and surfactant mass fraction, ž, The phase boundaries resemble the shape of a fish. Typically, temperature- -composition phase diagrams obtained for a 1/1 mass ratio of oil and water show a one-phase microemul- sion at relatively high ...
... variables are the temperature and the following composition variables (pressure is always kept constant) - the mass fraction of oil in the mixture of water and oil: 0 = a {(ma + me) () The mass fraction of surfactant in the mixture of all three components in ternary mixtures: = mcel(ma + ma + mc) ...
... order surfactant, toluene, water to suppress intermediate formation of liquid crystals. The mass fraction of the surfactant (or surfactant/additive) is calculated with Eqs. (2) or (3) and the mass fraction of the additive in the surfactant /additive mixture with Eq. (4). Samples were weighed ...Marija Ilic, Franz-Hubert Haegel, Vesna Pavelkic, Dragan Zlatanovic, Snezana Nikolic-Mandic, Aleksandar Lolic, Zoran Nedic. "The influence of alkyl polyglucosides (and highly ethoxylated alcohol boosters) on the phase behavior of a water/toluene/technical alkyl polyethoxylate microemulsion system" in Chemical Industry and Chemical Engineering Quarterly, National Library of Serbia (2016). https://doi.org/ 10.2298/CICEQ141105015I
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Application of Peleg model on mass transfer kinetics during osmotic dehydratation of pear cubes in sucrose solution
Vesna Pavelkić, Tanja Brdarić, Marija Petrović, Gavrilo Šekularac, Milica Košević, Lato Pezo, Marija Ilić (2015)The applicability of Peleg model was investigated for predicting mass transfer kinetics during the osmotic dehydration (OD) process of pears, at different concentrations (40, 60 and 70%, w/w) and temperatures (20, 35 and 50 °C) of sucrose solution. Increase in sucrose solution concentration resulted in higher water loss (WL) and solid gain (SG) values through the osmotic treatment period. After 360 min of osmotic treatment of pears, WL ranged from 23.71 to 31.68% at 20 °C, from 24.80 to ...Vesna Pavelkić, Tanja Brdarić, Marija Petrović, Gavrilo Šekularac, Milica Košević, Lato Pezo, Marija Ilić. "Application of Peleg model on mass transfer kinetics during osmotic dehydratation of pear cubes in sucrose solution" in Chemical Industry and Chemical Engineering Quarterly (2015). https://doi.org/10.2298/CICEQ141014004P
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Study of the Synergetic Effect of Co-Pyrolysis of Lignite and High-Density Polyethylene Aiming to Improve Utilization of Low-Rank Coal
Ivan Kojić, Achim Bechtel, Nikoleta Aleksić, Dragana Životić, Snežana Trifunović, Gordana Gajica, Ksenija Stojanović (2021)... value; Qn1 = 38.2 × mass proportion of C + 84.9 × (mass proportion of H − mass proportion of O/8)— 0.62 [53]; Qn2 = 34.1 × mass proportion of C + 121.4 × mass proportion of H − 15.3 × mass proportion of O + 10.5 × mass proportion of S [53]; Qn3 = 33.9 × mass proportion of C + 121.5 × mass proportion of H ...
... H − 12.7 × mass proportion of O + 9.3 × mass proportion of S [53]; Qn4 = 33.4 × mass proportion of C + 117.7 × mass proportion of H − 15.6 × mass proportion of O [54]; Qn5 = 33.8 × mass proportion of C + 122.3 × (mass proportion of H − mass proportion of O/8) + 9.4 × mass proportion of S [55]; Qg—gross ...
... Qg—gross calorific value; Qg6 = 33 × mass proportion of C + 120 × mass proportion of H − 16 × mass proportion of O [41]; Qn7 = 35.2 × mass pro- portion of C + 116.2 × mass proportion of H + 6.3 x mass proportion of N + 10.5 x mass proportion of S − 11.1 × mass proportion of O [40,56]; Qg8 = 971 + 323.6 × %C ...Ivan Kojić, Achim Bechtel, Nikoleta Aleksić, Dragana Životić, Snežana Trifunović, Gordana Gajica, Ksenija Stojanović. "Study of the Synergetic Effect of Co-Pyrolysis of Lignite and High-Density Polyethylene Aiming to Improve Utilization of Low-Rank Coal" in Polymers, MDPI AG (2021). https://doi.org/10.3390/polym13050759
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Some models for determination of parameters of the soil oscillation law during blasting operations
... form: R “ r 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 ...
... (m); Q—amount of explosive (kg); and R—reduced distance, expressed as R “ r 3?Q . 2.1. Derivation of Equation of Rock Mass Oscillation Law 2.1.1. Derivation of Equation of Rock Mass Oscillation—First Mode The equation of Sadovskii has been derived from the condition that if the radius of charge and ...
... s To establish the relationship between the oscillation velocity of the rock mass and basic parameters affecting its magnitude, being the amount of explosive, the distance from the blast site, characteristics of the rock mass and the type of blasting, is the equation of M. A. Sadovskii that is used ...Suzana Lutovac, Dragan Medenica, Branko Gluščević, Rade Tokalić, Čedomir Beljić. "Some models for determination of parameters of the soil oscillation law during blasting operations" in Energies, Basel, Switzerland : MDPI (2018). https://doi.org/10.3390/en9080617
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Rock slope stability analysis under Hoek–Brown failure criterion with different flow rules
The stability analysis of homogeneous rock slope following the Hoek–Brown failure criterion under the hypothesis of different flow rules is performed based on limit equilibrium and finite element methods. The applied failure criterion is the generalized Hoek–Brown that can be introduced as a shear/normal function in analysis applying different flow rules. The results are compared with those obtained by the application of equivalent shear strength parameters of the Mohr–Coulomb criterion, considering that this is still the most widely used ...Kružna klizna površ, Huk-Braunov kriterijum loma, Kriterijum popuštanja, Smičuća/normalna funkcija, Nivo napona, Verovatnoća i parametarska analizaSvetlana Melentijević, Zoran Berisavljević, Dušan Berisavljević, Claudio Olalla Marañón . "Rock slope stability analysis under Hoek–Brown failure criterion with different flow rules" in Bulletin of Engineering Geology and the Environment , Springer (2024). https://doi.org/10.1007/s10064-024-03667-0
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Phase relations and physical indicators of municipal waste from old landfills in Serbia
Due to certain similarities of municipal waste and soil, usually for the determination of basic parameters of physical state, laboratory and field tests which are common in geotechnical investigations are used. It is often to construct an apparatus for special purpose to perform some specific laboratory and field tests. Therefore, different values of indicators of municipal waste physical state can be found in the literature. The basic reasons should be found in different definitions and methods that researchers use ...municipal waste, moisture content, unit weight, specific gravity, grain size distribution, porosityGeneral Computer Science... change in relation to the depth of taken sample. The first phase means heating at a temperature of 55"% to constant mass. In this stage, loss of mass compared to a constant mass is defined as moisture (W). Thereafter, samples are heated to a temperature of 105%C and again masses of separately ...
... of 440% until material reaches constant mass. This method is in accordance with ASTM D2974-87 standard, according to which the content of organic matter (OS) is defined as a relation of mass of lost material smaller than 20 mm and remaining mass of material after heating, at a temperature ...
... to the following expressions: |. O ı_M H[l Ah (1—"0)F n=m An—n„—To Q) 1_Z H() w=w, — 4 G) m where: mx, mya — initial dry mass and mass of drained water Žuo, }a — Initial dry unit weight and dry unit weight in degradation stage no, n — initial porosity and porosity in a certain ...Dragoslav R Rakić, Irena G Basarić Ikodinović, Jovana M Janković, Tina D Đurić. "Phase relations and physical indicators of municipal waste from old landfills in Serbia" in Japanese Geotechnical Society Special Publication, The Japanese Geotechnical Society (2021). https://doi.org/10.3208/jgssp.v09.cpeg016
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Development of dynamic phenomena in the rock mass
Ljubojev Milenko, Popović Ratomir, Rakić Dragoslav. "Development of dynamic phenomena in the rock mass" in Mining Enginerering = Rudarski radovi no. 1, Bor, Srbija:Mining and metallurgy institute Bor (2011): 109-116
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Accuracy Increasing Methods of Belt Weigher Mass Measurement
Aleksandrović Snežana, Damnjanović Vesna, Jeftenić Ilija. "Accuracy Increasing Methods of Belt Weigher Mass Measurement" in Journal of the Technical University of Gabrovo 57, Gabrovo, Bulgaria:Technical University of Gabrovo (2018): 47-50
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Numerical investigation of caved rock mass friction and fragmentation change influence on gravity flow formation in sublevel caving
Lapčević Veljko, Torbica Slavko (2017)Lapčević Veljko, Torbica Slavko. "Numerical investigation of caved rock mass friction and fragmentation change influence on gravity flow formation in sublevel caving" in Minerals 7 no. 4, :MDPI (2017): 56. https://doi.org/https://doi.org/10.3390/min704
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Influence of DEM resolution on numerical modelling of debris flows in RAMMS - Selanac case study
Debris flows induced by intensive rainfall represent very hazardous phenomena in many parts of the World. Methods for prediction of runout distance of flow like mass movements are different and depending on the input data, rheology, and available or appropriate numerical solution. However, sometimes it is not easy to obtain pre event and post event high-resolution data in the rural or mountainous area. Thus, the topology of terrain is the most important input parameter for the every real case ...... Research (SLF, Davos). The mass balance equation incorporates the field variables flow height H (x, y,t) and flow velocity U (x, y,t) and is given by: 𝑄(𝑥, 𝑦, 𝑡) ˙ = 𝜕𝑡𝐻 + 𝜕𝑥 (𝐻 𝑈𝑥 ) + 𝜕𝑦 (𝐻 𝑈𝑦 ) (1) where Q(x, y,t) ˙ describes the mass production source term, and ...
... induced by intensive rainfall represent very hazardous phenomena in many parts of the World. Methods for prediction of runout distance of flow like mass movements are different and depending on the input data, rheology, and available or appropriate numerical solution. However, sometimes it is not easy ...
... use. In contrast, dynamical models are independent from local conditions, since such models implement physical principles, like the conservation of mass, momentum and energy of bulk mixtures (Rickenmann, 2005). In this paper, results of RAMMS debris-flow dynamical method are tested, based on Voellmy ...Jelka Krušić, Biljana Abolmasov, Mileva Samardžić Petrović. "Influence of DEM resolution on numerical modelling of debris flows in RAMMS - Selanac case study" in 4th Regional Symposium on Landslides in the Adriatic Balkan Region, 23-25 October 2019, Sarajevo, Bosnia and Herzegovina, Geotechnical Society of Bosnia and Herzegovina (2019). https://doi.org/ 10.35123/ReSyLAB_2019
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Influence of rock mass blastability on explosive energy distribution
Mitrović Stojan, Kričak Lazar, Negovanović Milanka, Janković Ivan, Zeković Dario. "Influence of rock mass blastability on explosive energy distribution" in Proceedings of the 9th International Symposium on Rock Fragmentation by Blasting, :Taylor & Francis/CRC Press (2009): 249-255
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Application of polymer composites for stabilization of degraded rock mass in mining
Trifunović Prvoslav, Tokalić Rade, Ganić Aleksandar. "Application of polymer composites for stabilization of degraded rock mass in mining" in Časopis Underground Mining Engineering/Podzemni radovi no. 22, Beograd:Rudarsko-geološki fakultet, Beograd (2013): 23-31
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Jointed rock mass characterization using field and point-cloud data
Marjanović Miloš, Pejić Marko, Đurić Uroš, Krušić Jelka, Abolmasov Biljana. "Jointed rock mass characterization using field and point-cloud data" in Geomechanics and Geodynamics of Rock Masses. Proceedings of the 2018 European Rock Mechanics Symposium. 1, :CRC Press, Taylor and Francis Group (2018): 319-324
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Estimation of the explosive mass based on the surface explosion crater on asphalt
Bjelovuk Ivana, Slobodan Jaramaz, Elek Predrag, Micković Dejan, Kričak Lazar. "Estimation of the explosive mass based on the surface explosion crater on asphalt" in Tehnički vjesnik - Technical Gazette 22 no. 1, Slavonski Brod, Hrvatska:Znanstveno-stručni časopis tehničkih fakulteta Sveučilišta u Osijeku (2015): Prihvaćen. https://doi.org/2203-23-TV-20130928113332
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Forecasting the Behaviour of the Rock Mass Before Taking Up the Excavation on a Deeper Layers of the Ore Body Borska Reka
Zlatanović Dragan, Milisavljević Vladimir, Milenko Ljubojev, Dragan Ignjatović, Zoran Stojanović (2015)Zlatanović Dragan, Milisavljević Vladimir, Milenko Ljubojev, Dragan Ignjatović, Zoran Stojanović. "Forecasting the Behaviour of the Rock Mass Before Taking Up the Excavation on a Deeper Layers of the Ore Body Borska Reka" in Mining and Metalurgy Engineering Bor no. 2, Bor:Mining and Metallurgy Institute, Bor (2015): 29-52. https://doi.org/10.5937/MMEB1502029Z
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Analysis of Method for Determination of the Rock Mass Oscillation Equation Parameters in the Nepričava open pit
Lutovac Suzana, Gluščević Branko, Tokalić Rade, Majstorović Jelena, Beljić Čedomir. "Analysis of Method for Determination of the Rock Mass Oscillation Equation Parameters in the Nepričava open pit" in 6th International Symposium MINING AND ENVIRONMENTAL PROTECTION, Vrdnik, Serbia, 21-24.06.2017, Belgrade:Faculty of Mining and Geology, CENTER FOR ENVIRONMENTAL INGENEERING (2017): 317-323
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Simplified model for determining rock mass oscillation velocity at limestone deposit
Suzana Lutovac, Branko Gluščević, Miloš Gligorić, Jelena Majstorović, Rade Tokalić. "Simplified model for determining rock mass oscillation velocity at limestone deposit" in Prospects for developing resource-saving technologies in mineral mining and processing, UNIVERSITAS Publishing - Petrosani, Romania (2022)