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Упит dcterms_subject_txt:stability criterion

96 items

  • Development and Application of Methodology for Quantification of Overbreaks in Hard Rock Tunnel Construction

    Zoran Berisavljević, Dragoljub Bajić, Vojkan Jovičić (2023)
    A methodology for determining overbreaks in hard rock tunnel construction using the drill-and-blast technique is presented in this paper. The methodology was developed for and applied to crystalline medium- to thick-bedded limestone, but it can be used in any jointed hard rock mass. Overbreaks are inevitable in hard rock tunnelling in a low-confinement environment (shallow tunnels up to several hundred meters deep) as a result of wedge failures along unfavourably oriented discontinuities caused by blasting. It is widely accepted ...
    hard rock, drill-and-blast, geological overbreak, technological overbreak, stability criterion, discontinuity orientation, tunnel construction

  • Assessing Criteria Weights by the Symmetry Point of Criterion (Novel SPC Method) - Application in the Efficiency Evaluation of the Mineral Deposit Multi-Criteria Partitioning Algorithm

    Zoran Gligorić, Miloš Gligorić, Igor Miljanović, Suzana Lutovac, Aleksandar Milutinović (2023)
    Information about the relative importance of each criterion or the weights of criteria can have a significant influence on the ultimate rank of alternatives. Accordingly, assessing the weights of criteria is a very important task in solving multi-criteria decision-making problems. Three methods are commonly used for assessing the weights of criteria: objective, subjective, and integrated methods. In this study, an objective approach is proposed to assess the weights of criteria, called SPC method (Symmetry Point of Criterion). This point ...
    Вишекритеријумско одлучивање, тежине критеријума, тачка симетрије критеријума, налазиште минерала, алгоритам, процена учинка

  • Model for the Selection of the Optimal Location of a Thermal Power Unit According to the External Coal Conveyance Criterion

    Grujić Miloš, Ristović Ivica, Grujić Miodrag (2010)

  • Multicriteria Analysis and Optimization of Groundwater Control Systems with Variable Values of Criterion over Predefined Time Points

    Milica Stepanović, Dragoljub Bajić, Dušan Polomčić (2021)
    VIKOR метода, алтернативе, компромисно решење, подземне воде, одводњавање рудника

  • Application of a Method for Intelligent Multi-Criteria Analysis of the Environmental Impact of Tailing Ponds in Northern Kosovo and Metohija

    Gordana Milentijević, Blagoje Nedeljković, Milena Lekić, Zoran Nikić, Ivica Ristović, Jelena Đokić (2016)
    flotacijska jalovišta, životna sredina, višekriterijumska analiza, ekologija, Trepča
    ... function: I “Simple” criterion P (a, b) = { 0, i f d ≤ q 1, i f d > q II Quasi criterion P (a, b) = { 0, i f d ≤ 0 1, i f d > q III Criteria for linear preference P (a, b) =      0, i f d ≤ 0 d p , i f 0 < d ≤ p 1, i f d > p IV Nivoj criterion—stage criterion P (a, b) =    ...
    ... and quantitative data for each criterion and alternative. The PROMETHEE method introduces preference function P(a,b) for alternatives, a and b, which are valued by function criterion. Energies 2016, 9, 935 9 of 18 Alternative a is better than b according to criterion f if f(a) < f(b) [27]. The value ...
    ... 1428. For criterion C7, tailing activity, A1 Žarkov Potok and A5 Bostanište 0.3636 both have the greatest value of weight coefficient and the value of the remaining three tailings is 0.0909. For criterion C8, geology, all tailings have identical weight coefficient which is 0.2. For criterion C9, general ...

  • 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

  • A multi-criteria approach for assessing the potential of renewable energy sources for electricity generation: Case Serbia

    Boban Pavlović, Dejan Ivezić, Marija Živković (2021)
    When assessing the potential of renewable energy alternatives for electricity generation, it is necessary to implement a multi-perspective approach that includes economic, technical, environmental, and socio-political criteria. For the evaluation of criteria and alternatives, the Fuzzy Analytical Hierarchy Process (FAHP) method is applied. The obtained weights are formed according to the values of energy indicators and expert judgments. The use of a fuzzy numerical value scale for the assessment of expert judgments and energy indicators provides a more sensitive ...
    Proizvodnja električne energije, Obnovljivi izvori energije, Višekriterijumsko odlučivanje, Srbija
    ... (reactors) formed from biomass by an anaerobic process. 3.2.1. Economic criterion (C1) The economic criterion of RESs refers to the cost of producing electricity from a particular RES. As an energy indicator that reflects economic criterion, here ‘‘The global weighted-average costs of electricity’’ (USD/kWh) ...
    ... respect to socio-political criterion. Each of these linguistic variables is assigned one of the triangular fuzzy numbers (TFNs) (Table 3) (Dubois et al., 2007). In the case of experts ‘assessment of the criteria and experts’ prioritization of RES alternatives regarding social criterion, the aggregation of ...
    ... hundred MW of intermittent capacities can be connected without further investments (RS2, 2016). 3.2.2. Technical criterion (C2) For the comparison of RESs regarding the technical criterion, the ‘‘Unused available technical potential for electricity gener- ation’’ is used as an indicator (Table 5). In ...

  • Fuzzy optimization in hydrodynamic analysis of groundwater control systems: Case study of the pumping station “Bezdan 1”, Serbia

    Dragoljub Bajić, Dušan Polomčić (2014)
    A groundwater control system was designed to lower the water table and allow the pumping sta-tion “Bezdan 1” to be built. Based on a hydrodynamic analysis that suggested three alternative solutions, mul-ticriteria optimization was applied to select the best alternative. The fuzzy analytic hierarchy process methodwas used, based on triangular fuzzy numbers. An assessment of the various factors that influenced the selec-tion of the best alternative, as well as fuzzy optimization calculations, yielded the “weights” of the alternativesand the ...
    groundwater lowering, groundwater management scenario, fuzzy analytic hierarchy process,expert knowledge, triangular fuzzy numbers, linguistic variables
    ... 81) Finally, the ultimate criterion weights were obta- ined through normalization: W = (0.33, 037, 0.3) Shown below are the criterion - based evaluation of alternatives (where three matrices were generated) and the ultimate weight vectors for each comparison. Criterion 1 (matrix, the value of fuzzy ...
    ... are compared for each criterion separately. Matrices are produced and then the weight vectors determined following Steps 1 through 5. Step 7. Here the ultimate weights of the alternatives are determined. They are obtained by multiplying the weight vectors derived from the criterion matrix by the weight ...
    ... weights): W’ = (0.56,1,0.01) W = (0.36,0.64,0.01) Criterion 2 (matrix, the value of fuzzy synthetic extent, the degree of possibility, the weight priority vectors and the ultimate values of the weights): W’ = (0.06,1,0.72) W = (0/03,0.56,0.4) Criterion 3 (matrix, the value of fuzzy synthetic extent, ...

  • Multi-Criteria Approach for Selecting Optimal Dozer Type in Open-Cast Coal Mining

    Ivan Janković, Stevan Đenadić , Dragan Ignjatović , Predrag Jovančić , Tomislav Šubaranović, Ivica Ristović (2019)
    Analitički hijererhijski proces (AHP), dozeri, eksploatacija uglja, površinski kopovi
    ... the following section, Sections 3.5–3.8, each sub-criterion is analysed separately, as well as the calculations for each alternative related to the mentioned sub-criteria. 3.5. Results of Tehnical Parameters (TP) The most significant sub-criterion in the group of technical parameters is towing force ...
    ... the following section, Sections 3.5–3.8, each sub-criterion is analysed separately, as well as the calculations for each alternative related to the mentioned sub-criteria. 3.5. Results of Tehnical Parameters (TP) The most significant sub-criterion in the group of technical parameters is towing force ...
    ... successful functioning of the machine as well as its maintenance. It may be concluded that not a single sub-criterion could be prioritized as more important in relation to others which is why each criterion was assigned a weight coefficient of 0.250. The results of the calculated weight coefficients of al ...

  • Indexing of textual databases based on lexical resources: A case study for Serbian

    Ranka Stanković, Cvetana Krstev, Ivan Obradović, Olivera Kitanović (2015)
    In this paper we describe an approach to improvement of information retrieval results for large textual databases by pre-indexing documents using bag-of-words and Named Entity Recognition. The approach was applied on a database of geological projects financed by the Republic of Serbia in the last half century. Each document within this database is described by metadata, consisting of several fields such as title, domain, keywords, abstract, geographical location and the like. A bag of words was produced from these ...
    ... using specific criteria. For example, if the user chooses the criterion mineral raw material, then only the following fields in the database are taken into consideration: title, field, keywords, and abstract, while for location criterion other fields are searched: municipality, county, name of the c ...
    ... conjunction and when there are more keywords within one criterion a disjunction is generated. For example, if the user is inter- ested in projects that deal with the research of “gold in the Bor region”, then mineral resource is selected as one criterion and the words zlato ‘gold’ and Au are defined for search ...
    ... search, and the system will search for any of these two words. If another criterion is added, for example location, then keywords which define the desired location are entered, e.g. Bor (the name of a city) or Borski okrug ‘Bor county’. If we want a MWU to be treated as a whole, then it is entered under ...

  • Stability analysis on slope PK dacite Ceramide

    Vladimir Čebašek, Veljko Rupar, Vladimir Ivoš, Vladimir Petković (2018)
    Safe surface mining exploitation of minerals is possibile only if stable bench and overall slopes in the open pit are construct. In order to to construct stable open pit slopes, it is necessary to carry out certain physical and mechanical laboratry testing of mineral raw materials in order to determine the geomechnical calculating parameters. These calculating parameters represent the base ground for performing slopes analyses and the open pit design. In this paper, an stability analysis of benches and ...
    dacite, slope stability, surface mining

  • Determination of Mechanical Properties of Altered Dacite by Laboratory Methods

    Veljko Rupar, Vladimir Čebašek, Vladimir Milisavljević, Dejan Stevanović, Nikola Živanović (2021)
    This paper presents a methodology for determining the uniaxial and triaxial compressive strength of heterogeneous material composed of dacite (D) and altered dacite (AD). A zone of gradual transition from altered dacite to dacite was observed in the rock mass. The mechanical properties of the rock material in that zone were determined by laboratory tests of composite samples that consisted of rock material discs. However, the functional dependence on the strength parameter alteration of the rock material (UCS, intact ...
    Geology, Geotechnical Engineering, Engineering Geology
    ... parameters of the Mohr–Coulomb failure criterion were calculated based on the measured laboratory data, which are shown in Table 4, while the comparative relationship is shown in the diagram (Figure 12). Table 4. Shear strength parameters of the Mohr-Coulomb failure criterion. Material Friction Angle ϕ (◦) ...
    ... 30% AD, (d) 50% AD, (e) 70% AD, (f) 100% AD. Minerals 2021, 11, 813 11 of 19 The parameters of intact rock material for the Hoek–Brown failure criterion [23] were determined based on the test results of the triaxial test and mean values of UCS and for geological strength index values GSI = 100 and ...
    ... value’s volumetric participation of altered dacite for 30%, 50%, 70%, and 100% are very close. Table 3. Strength parameters of Hoek–Brown failure criterion. Material Intact UCS σci TX (MPa) Material Constant mi AD 0 101.350 31.581 AD 10 58.000 29.014 AD 30 37.329 25.267 AD 50 34.397 24.166 AD 70 ...

  • Development of integrated fuzzy model for mine management optimization

    Miodrag Čelebić, Sanja Bajić, Dragoljub Bajić, Dejan Stevanović, Duško Torbica, Vladimir Malbašić (2023)
    fuzzy logika, višekriterijumsko odlučivanje, ocenjivanje eksperata
    ... triangular fuzzy numbers [3,5,11]4 Element identification serves to formulate a question for the expert who is examining the problem: “Is a criterion better for pairwise comparison in the matrix, and to what extent?” Proper matrix generation of all the criteria relative to alternative solutions ...
    ... Step 1. Mathematical optimization begins with predefined criteria that affect the selection of one of several alternatives. Then a matrix of criterion X is con- C. R. Acad. Bulg. Sci., 76, No 9, 2023 1415 structed with fuzzy numbers assigned by the decision maker (expert) using the FAHP scale ...
    ... the form of a non-fuzzy number, whose maximum value is 1: W = (c (Ax),c(4>2),...,c (A„)T). Step 6. The alternatives are compared against each criterion individually. Thus, new matrices are defined and then the weight priority vectors determined, as described in Steps 1 through 5. Step 7. The ...

  • Spatial distribution of major and trace elements in artificial lakes in Serbia: health risk indices and suitability of water for drinking and irrigation purposes

    Goran Marković, Aleksandar Ž. Kostić, Nebojša Đ. Pantelić, Radojka Maletić, Jana Štrbački, Jovan Cakić, Lazar Kaluđerović, Biljana P. Dojčinović, Angelo Maria Giuffrè, Jelena B. Popović-Djordjević (2023)
    Lakes and reservoirs are the main water resources for household, irrigation, and industrial use. Hence, it is necessary to control water pollution and have reliable information on water quality, which refers to its suitability for a particular purpose. The main objective of this study was to evaluate the suitability of water for drinking and irrigation purposes from ten artificial lakes on the territory of the Republic of Serbia. The physicochemical parameters were determined using standard analytical methods, whereas the ...
    Management, Monitoring, Policy and Law, Pollution, General Environmental Science, General Medicine

  • Analiza osnovnih indikatora upotrebnog kvaliteta mašina pomoćne mehanizacije na površinskim kopovima uglja

    Stevan Đenadić, Dragan Ignjatović, Predrag Jovančić, Milena Lekić, Žarko Aleksić, Ivan Janković (2022)
    Izbor optimalnog tipa mašine i adekvatno upravljanje kroz životni vek je kompleksan zadatak. Osnovna pitanja koje se postavljaju prilikom rešavanja ovog zadatka vezana su za stepen zadovoljenja rada mašine i optimalan trenutak zamene iste. U ovom radu je izvršena analiza rada dozera koji su u radu na površinskom kopu lignita RB Kolubara. Analizom je obuhvaćeno 4 različita proizvođača dozera a to su: Caterpillar, Dressta i Shantui i Liebherr. Analiza je izvršena sa aspekta ukupnih troškova koji se stvaraju i ...
    rudarstvo, mehanizacija, upotrebni kvalitet, troškovi, empirijska raspoloživost

  • Validation of vulnerability assessment by means of the Time Dependent, Model: case study from the Slovenian karst catchment

    Vladimir Živanović, Nataša Ravbar, Igor Jemcov (2019)
    Groundwater vulnerability assessment methods are continuously being developed and existing methods are very often modified to provide better simulation of natural protection conditions and more objective results. Most frequently used methods are based on calculation of predefined parameters influencing water infiltration and underground flow, which can often lead to bias conclusions related to vulnerability evaluations. Some other methods, like the Time Dependent Model (TDM) are based on an approach, where parametrization is obtained at the final stage of the ...
    Ocena ranjivosti podzemnih voda, karstne podzemne vode, TDM metoda, delineacija sanitarnih zona, Slovenački karst

  • Development Of The Serbian Geological Resources Portal

    Ranka Stanković, Jelena Prodanović, Olivera Kitanović, Velizar Nikolić (2011)
    ... factors and the number of key word/phrase appearances. For exam- ple, if the search criterion “mineral resource” is cho- sen – first a list of entities and attributes which are being searched for the given criterion is read from the database. In this case two entities are searched, the table of documents ...
    ... and the sum of weigh factors of the search field. Namely, a number of entities and their attributes within the database corre- spond to each search criterion, and each entity/attrib- ute has certain weight factors which determine the rel- evance of the appearance of a resource within the set of results ...

  • Highway construction in fossil landslides zones – Lessons learned from the Grdelica Gorge, Serbia

    Biljana Abolmasov, Marinos Skempas, Svetozar Milenković, Janko Radovanović, Miloš Marjanović (2022)
    Landslides are common on roads, which directly affect the flow of traffic and the connection and functioning of the population in surrounding area. Therefore, it is necessary to investigate them in the shortest possible time and to determine and carry out the remediation solution. Functionality of the state roads is immensely important so it is necessary to ensure that the traffic is maintained during remediation activities. Therefore, design solutions and remediation execution technology should be adapted to these requirements. ...
    klizište, mere sanacije, stabilnost

  • Definisanje parametara čvrstoće na smicanje kod izvođenja kosina u ispucalom stenskom masivu

    Zoran M. Berisavljević (2016-04-01)
    Definisanje parametara čvrstoće na smicanje ispucalih stenskih masa predstavlja jedanod najzahtevnijih zadataka mehanike stena. Geotehnička istraživanja su uglavnomograničena na rezultate laboratorijskih ispitivanja malih makroskopski homogenihuzoraka, sa kojih se vrši ekstrapolacija rezultata na terensku razmeru. Ispitivanja semogu vršiti in situ, ali su i ona ograničena veličinom korišćene aparature imikrolokacijom na kojoj se vrše ispitivanja. Pored toga, moguće je vršiti različitaispitivanja na fizičkim modelima, koja su veoma složena i skupa. Ekstrapolacijapodataka sa malog uzorka na terensku razmeru daje mnogo bolje rezultate ...
    naponsko stanje, ispucalost, heterogenost, čvrstoća na smicanje, geološki indeksčvrstoće, Hoek-Brownov materijal, kompozitni uzorci, dezintegracija, povratna analiza

  • Hydrochemical changes and groundwater grouping data by multivariate statistical methods within one karst system: recharge–discharge zone (Eastern Serbia case study)

    Ljiljana Vasić, Dragana Živojinović, Vladana Rajaković-Ognjanović (2020)
    Geochemistry and Petrology