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Упит dcterms_subject_txt:key block theory

243 items

  • 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

  • Pre-failure deformation monitoring as rockfall prediction tool

    Miloš Marjanović, Biljana Abolmasov, Zoran Berisavljević, Marko Pejić, Petko Vranić (2021)
    General Engineering
    ... between 2016-2017 epoch (figure 3d) indicates further progressive block failures, in upslope direction. This feature will become interesting for precursor analysis in the following sequences. Mechanics and Rock Engineering, from Theory to Practice IOP Conf. Series: Earth and Environmental Science ...
    ... bedding (orientation 39/44°) and two conjugated joint sets (orientation 187/62° and 148/79°) were established, appointing to the block and wedge failure potential. Rock block size and volumes (0.5-2.7 m3) were reported in [9], as well as the first monitoring results and the first rockfall analyses, wherein ...
    ... events in the following years, we were able to define the pre-failure threshold which can be applied to the adjacent rock blocks, assuming a similar block volume. It also enabled us to anticipate and simulate the event before it happens. This approach allows planning, prevention and protection, and ...

  • Improving efficiency of thermal power plants through mine coal quality planning and control

    Mirjana Banković, Dejan Stevanović, Milica Pešić, Aleksandra Tomašević, Ljiljana Kolonja (2018)
    Главни циљ контроле квалитета угља у рудницима лигнита је снабдевање термоелектрана угљем чији квалитет мора да се креће унутар одређених квалитативних ограничења. Карактеристике угља могу да утичу на ефикасност, поузданост и расположивост како котла тако и јединица за контролу емисије. У овом раду аутори су презентовали интегрисану симулацију рударског процеса као нови приступ у истраживању променљивости калоричне вредности угља приликом експлоатације комплексног лежишта лигнита. Резултати таквог приступа омогућавају драгоцен увид у перформансе континуалног рударског система у смислу контроле променљивости ...
    mine planning, variability of coal quality, simulation, coal blending

  • Evaluation And Perspectives Of Underground Coal Mines In Serbia

    Vladimir Milisavljević, Milena Lekić, Ivica Ristović, Vojin Čokorilo, Aleksandar Cvjetić (2017)
    ... Reserves, score is given in relation to existing A and B amounts of reserves (criteria C1); • Geological conditions, such as faulting, seam inclination, block size, seam variation, roof and floor conditions, rock pressure and geo-mechanic conditions (criteria C2); • Mining hazards, such as gas, water, ...
    ... and spontaneous combustion (criteria C3); • Potential for mechanization, such as seam inclination, seam thickness, floor and roof conditions, block size, coal clearance facilities and supply facilities (criteria C4); • Quality of coal and products, such as coal type, sulphur content, ash content ...
    ... Vrška Čuka 1 2 3 1 4 2 2 Ibarski mines - Jarando 1 2 2 1 4 2 1 - Tadenje 1 1 4 2 3 2 1 REMBAS - Strmosten 3 3 2 3 3 4 4 - Block IV 2 2 2 3 4 4 2 - Senjski rudnik 1 2 2 2 3 4 1 Soko 5 2 1 3 3 4 4 Bogovina 2 3 4 1 2 2 1 Jasenovac 2 2 3 2 3 2 2 Lubnica 4 4 2 3 2 2 2 ...

  • Numerical Models of Debris Flows with Entrainment Analysis-Case Studies from the Republic of Serbia

    Jelka Krušić , Biljana Abolmasov, Miloš Marjanović (2021)
    The results of material entrainment analysis in RAMMS debris flow software, as well as numerical models of final flow heights for two case studies from the Republic of Serbia are presented. Both of debris flow cases started with initial sliding of huge volume block, prolonging to behave as flowing process. Results of the analysis showed that entrainment material affects final results of transportation model, runout distance, deposition area and volume of debris flow. In both cases entrainment volume is very ...
    tecišta, zadržavanje nanosa, RAMMS, validacija

  • Утицај похабаности резних елемената роторног багера на ниво вибрација погона за копање

    Филип Милетић (2023)
    У докторској дисертацији је анализиран утицај похабаности резних елемената роторног багера на потрошњу електричне енергије и ниво амплитуде вибрација погона за копање. Креиран је модел који у функцији стања резних елемената дефинише зависност разматраних физичких феномена. За развој модела примењене су једначине теорије осцилација и Ватметарска метода [1] којом се одређује потрошња електричне енергије. За верификацију модела извршена су мерења на роторном багеру SRs2000.32/5+VR ангажованом на откопавању откривке на површинском копу Тамнава–Западно поље. Обављено је пет мерења. Резни елементи су ...
    роторни багер, резни елементи, хабање, вибрације, потрошња електричне енергије

  • INVENTS: A Hybrid Mine Ventilation Planning and Design System

    Lilić Nikola, Stanković Ranka, Obradović Ivan (2013)
    Ventilation system analysis is a complex process based on the calculation and analysis of numerous parameters. These problems can be successfully solved by the SimVent numerical package, but a full understanding and use of the obtained results require the involvement of an experienced specialist in the ventilation field. The solution was found in the creation of a hybrid system INVENTS, whose knowledge base represents a formalization of the expert knowledge in the mine ventilation field. In this paper we ...
    hybrid systems, mine ventilation, expert systems
    ... contemporary mine theory and practice differs substantially from the traditional approach. The novel approach uses all possibilities offered by computer hardware and software that are at the disposition of mine engineers. Software packages for mine ventilation simulation obtained a key role in the process ...
    ... following blocks: 1. a block for the analysis of air flow and pressure distribution in the ventilation network, 2. a block for the analysis of climate conditions in mine chambers, 3. a block for temperature and heat depression analysis in fire incidence conditions, 4. a block for gas distribution analysis ...
    ... and design of technological systems for deposit exploitation. System planing is an introduction to the mine design process. In the planning process key relations are defined that have to be taken into account in the mine design phase. The initial step in the mine ventilation planing and design process ...

  • INVENTS: a hybrid system for subsurface ventilation analysis

    Nikola Lilić, Ranka Stanković, Ivan Obradović (2000)
    Ventilation system analysis is a complex process based on the calculation and analysis of numerous parameters. These problems can be successfully solved by the SimVent numerical package, but a full understanding and use of the obtained results require the involvement of an experienced specialist in the ventilation field. The solution was found in the creation of a hybrid system INVENTS, whose knowledge base represents a formalization of the expert knowledge in the mine ventilation field. In this paper we ...
    ... contemporary mine theory and practice differs substantially from the traditional approach. The novel approach uses all possibilities offered by computer hardware and software that are at the disposition of mine engineers. Software packages for mine ventilation simulation obtained a key role in the process ...
    ... following blocks: 1. a block for the analysis of air flow and pressure distribution in the ventilation network, 2. a block for the analysis of climate conditions in mine chambers, 3. a block for temperature and heat depression analysis in fire incidence conditions, 4. a block for gas distribution analysis ...
    ... and design of technological systems for deposit exploitation. System planing is an introduction to the mine design process. In the planning process key relations are defined that have to be taken into account in the mine design phase. The initial step in the mine ventilation planing and design process ...

  • Application of stochastic models for mine planning and coal quality control

    Dejan Stevanović, Božo Kolonja, Ranka Stanković, Dinko Knežević, Mirjana Banković (2014)
    ... decision variables describing in which period the particular block is extracted and what is its destination (either directly to the power plant or to processing plant and stockyard) is quite straightforward. But the hypothetical optimal block ex- traction sequence may be completely impractical due to ...
    ... decision variables describing in which period the particular block is extracted and what is its destination (either directly to the power plant or to processing plant and stockyard) is quite straightforward. But the hypothetical optimal block ex- traction sequence may be completely impractical due to the ...
    ... necessary to know the sulfur content of coal that will form the pile. These grades come from a geological block model mined according to a sequence determined by an optimal mine scheduling. These block models how- ever are obtained via classical interpolation algorithms, such as ordinary kriging. In these ...

  • Gate Road Support Deformation Forecasting Based on Multivariate Singular Spectrum Analysis and Fuzzy Time Series

    Luka Crnogorac, Rade Tokalić, Zoran Gligorić, Aleksandar Milutinović, Suzana Lutovac, Aleksandar Ganić (2021)
    Underground mining engineers and planners in our country are faced with extremely difficult working conditions and a continuous shortage of money. Production disruptions are frequent and can sometimes last more than a week. During this time, gate road support is additionally exposed to rock stress and the result is its progressive deformation and the loss of functionality of gate roads. In such an environment, it is necessary to develop a low-cost methodology to maintain a gate road support system. ...
    deformacije podgrade, lasersko skeniranje, višekanalna singularna spektralna analiza, prognoza, klasterisanje fuzzy vremenskih serija
    ... . . , M). To form a new block Hankel matrix in a vertical form, we need to have K1 = . . . = KM= K. The result of this step is the following block Hankel trajectory matrix: YV =  Y(1) ... Y(M) , (6) where YV indicates that the output of the first step is a block Hankel trajectory matrix formed ...
    ... Y(‘) (i=1, ...,M). To form a new block Hankel matrix in a vertical form, we need to have Kj = ... = Ky= K. The result of this step is the following block Hankel trajectory matrix: y(1) Yy = , (6) y(M) where Yy indicates that the output of the first step is a block Hankel trajectory matrix formed in ...
    ... value of K, construct the trajectory matrix Y(i) = [ Y(i) 1 , . . . , Y(i) K ] = (ymn) Li ,K m,n=1 for each single series separately; construct the block trajectory matrix YV as follows: YV =  Y(1) ... Y(M) , (8) let UVj = ( U(1) j , . . . , U(M) j )T be the jth eigenvector of the YVYT ...

  • Application of MCDA in the determination of optimal block size for open-pit modelling and mine planning

    Petar Marković, Dejan Stevanović, Milica Pešić Georgiadis, Mirjana Banković (2021)
    The process of creating a geological block model as the basis for a further detailed design and planning of mining operations is a very responsible task. Errors made during this initial process are transferred to all other phases of the mining project. Certainly, one of the most important decisions for the modelling process is the choice of the appropriate size of the blocks that form the model itself. The determination of the optimal block size is not a simple ...
    dimenzije minibloka, višekriterijumska analiza, AHP, modeliranje ležišta, planiranje na površinskim kopovima

  • Approach to operational mine planning: Case study Tamnava West

    Dejan Stevanović, Mirjana Banković, Milica Pešić Georgiadis, Ranka Stanković (2014)
    ... packages. For that reason in presented case study operational mine planning is done with Minex software. Key words: operational planning, geological modeling, coal quality control, mining block and cut. 1. INTRODUCTION Modern mining is characterized by continuous worsening of production conditions ...
    ... the actual width of the block which is excavated by particular BWE). 2. Also, bench area is divided parallel to the direction of excavation advancing. This division simulates the advancing of each excavator in the mining block, i.e. mining block length. Block length is the unique value ...
    ... each BWE in advance. Single mining block is shown also on Figure 7. Because geometry of a mining block is connected with geological model it is possible to determine the reserves of coal and waste, as well as the quality achieved by excavating the each block on each bench. Figure 7. ...

  • Complex dynamics of spring-block earthquake model under periodic parameter perturbations.

    Kostić Srđan, Vasović Nebojša, Franović Igor, Todorović Kristina (2014)

  • Impact of the Bucket Wheel Support at Technical Parameters of the Block and Bucket Wheel Excavator Capacity

    Ignjatović Dragan, Petrović Branko, Jovančić Predrag, Bošković Saša (2014)

  • Organic geochemical study of the upper layer of Aleksinac oil shale in the Dubrava block, Serbia

    Gajica Gordana, Šajnović Aleksandra, Stojanović Ksenija, Kostić Aleksandar, Slipper Ian, Antonijević Milan, Nytoft Hans Peter, Jovančićević Branimir (2017)

  • Analogue modelling of strain partitioning along a curved strike-slip fault system during backarc-convex orocline formation: Implications for the Cerna-Timok fault system of the Carpatho-Balkanides

    Nemanja Krstekanić, Ernst Willingshofer, Taco Broerse, Liviu Matenco, Marinko Toljić, Uroš Stojadinović (2021)
    analogno modelovanje, raspodela deformacija, geometrija indentera, Černa i Timok rasedni sistem
    ... rigid block, where, otherwise, extension along the northern edge of the indenter would take place. At the same time, the area to the north- west of the rigid block is free to move. This setup predefines velocity discontinuities (VD) along the southern and western margins of the rigid block and along ...
    ... corner of the rigid block (Fig. 3e and f, cross-section d-d’ in Fig. 3g) represents the area where strike-slip deformation transitions to thrusting with significant changes of fault orientations. The strike of major structures follows the predefined curvature of the rigid block resulting in curved ...
    ... Directly south of the indenter, the displacement is perpendicular to the rigid block. In this part of the system, the inclined margin acts as a thrust ramp, along which material has been transported on top of the rigid block, resembling a flat-ramp-flat geometry (Fig. 3g, cross-section e-e’) or Coulomb ...

  • New data on the age of an Upper Cretaceous clastic-carbonate succession in Brežđe (Western Serbia)

    Nevenka Đerić, Nataša Gerzina (2014)
    Gornja kreda, radiolarije, Jadar blok, zapadni pojas Vardarske zone, zapadna Srbija
    ... Drina-Iva:njica continental block (DIMITRIJEVIĆ & DI- ava Žona } Neotethys suture MITRIJEVIĆ, 1973; ROBERTSON & KARAMATA, 1994; [0 Obducted Eastern Vardar Ophiolites KARAMATA et al. 1999, DIMITRIJEVIĆ, 2001). Tisza Mega-Unit jE » Another continental unit, i.c. the Jadar Block, is situated [ Dacia Mega-Unit ...
    ... during the Late Jurassic (SCHMID et al., 2008). However, the original position of the Jadar block below the ophiolitic mćlange is visible only in the area of Takovo. In other places, however, the Jadar block seems to be thrust over the mćlange and ophiolites (south of Valjevo) and partly over the ...
    ... age were studied in a carbonate-clastic section from the Cretaceous sedi- mentary cover that unconformably overlies Triassic sediments of the Jadar Block. According to the identified radi- olarian associations, the studied limestone is of Santonian age. Considering the fact that these sediments belong ...

  • Geomechnical research for the new bucket wheel excavator testing at Open pit “Filijala”

    Vladimir Čebašek, Nebojša Gojković, Veljko Rupar, Miodrag Pribićević (2020)
    Since 1976 cement marl excavation at open-pit mine „Filijala” is carried out by continuous exploitation technology using bucket wheel excavator SH 400 manufactured by Orenstein und Koppel (O & K) company. Due to the bucket wheel excavator time-worn and high operating cost it was necessary to replace it with new one. In order to test the new bucket wheel excavator and prove its capacity a testing zone was defined as test block for excavation, in which the bucket wheel ...
    отпор на копање, лапорац, роторни багер

  • Age and microfacies of oceanic Upper Triassic radiolarite components from the Middle Jurassic ophiolitic mélange in the Zlatibor Mountains (Inner Dinarides, Serbia) and their provenance

    Hans-Juergen Gawlick, Nevenka Đerić, Sigrid Missoni, Nikita Bragin, Milan Sudar, Divna Jovanović (2017)
    Neo-Tethys, trench-like basins, synorogenic deposition, evolving thrust belt, Triassic palaeogeography
    ... 2 — Samples SCG 48a and b overlying: a Late Triassic fore-reef to reefal block. Locality 3 — Samples SCG 50-52 from the ophiolitic mćlange between a Late Triassic fore-reef to reefal block and an Early Carnian reefal block of the Wetterstein Formation. GEOLOGICA CARPATHICA, 2017, 68, 4, 350—365 ...
    ... a Late Triassic fore-reef to reefal block (reefal Dachstein Limestone). Samples SCG 50, 51 and 52 derive from the ophiolitic mćlange filling: a depression between the Late Triassic fore-reef to reefal block and an Early Carnian reefal limestone . block (Wetterstein · Formation). | Sample ...
    ... Reddish Mn-rich massive radiolarite (Fig. 4) from a depres- sion-fill between a Late Triassic fore-reef to reefal block (Dachstein Limestone) and an Early Carnian reefal block. The microfacies shows a bioturbated radiolarian packstone. Other organisms are missing. The following taxa were deter- ...

  • Application of the Fuzzy theory in the evaluation of operating parameters of auxiliary mechanization on open-cast coal mine, case study: pipelayers

    Stevan Djenadić, Miloš Tanasijević, Filip Miletić, Predrag Jovančić (2022)
    Achieved operating parameters are the main indicator of the work quality and selection of mining machines. The effectiveness of a coal mine is correlated with the availability of basic and auxiliary machines. The main task of auxiliary machines in lignite mines is to achieve optimal working conditions. From an economic point of view, auxiliary machines generate up to 20% of the lignite mines' total costs. These are the primary reasons for analyzing their current work and making decisions in ...
    upotrebni kvalitet, fazi teorija, rudarske mašine