Mircevska V.,Institute of Earthquake Engineering and Engineering Seismology IZIIS |
Nastev M.,Geological Survey of Canada |
Hristovski V.,Institute of Earthquake Engineering and Engineering Seismology IZIIS |
Bulajic I.,Mining Institute
Journal of Earthquake Engineering | Year: 2014
The magnitudes of the hydrodynamic pressures at the dam-fluid interface depend on the amount of energy transmitted to the fluid by the vibration of the reservoir boundaries. Although the reservoir topology can have a considerable impact on the amount of generated energy, it has still not been adequately addressed. This article treats an arch dam-fluid interaction considering a compound wave field of compressive and dilatational waves in a reservoir with a complex topology. A truncation surface was located at a distance beyond which the simulated wave field has only negligible effects. © Copyright © IZIIS Institute of Earthquake Engineering.
Mircevska V.,Ss. Cyril and Methodius University of Skopje |
Bickovski V.,Ss. Cyril and Methodius University of Skopje |
Aleksov I.,Mining Institute |
Hristovski V.,Ss. Cyril and Methodius University of Skopje
Engineering Analysis with Boundary Elements | Year: 2013
Fluid-structure interaction phenomenon, by its nature, is three-dimensional and consequently dependant on the shape of a dam and canyon that in-fact defines the spatial domain where the generated acoustic waves are spread. The complex topography of the terrain in general requires sufficiently large extent of reservoir to be included in the model, which is undoubtedly feasible if BEM technique is used. This paper shows that the irregular canyon shape dictates the most adequate location of the truncation surface that gives the smallest negative impact on calculation accuracy. The derived conclusions are based on various 3D analyses of a rigid dam-reservoir system with different shapes and lengths of the fluid domain, where the fluid is treated as incompressible and inviscid. The presented work contributes towards disclosure of the topographic site effects and towards promotion of simple and effective procedure for generation of BE mesh, which is quite accurate in following the topology of the terrain. © 2013 Elsevier Ltd.
Guo L.,University of Cambridge |
Schekoldin R.,Mining Institute |
Scott R.,University of Cambridge
Journal of Petroleum Geology | Year: 2010
The Novaya Zemlya archipelago in Arctic Russia contains an Early Mesozoic fold-and-thrust belt that exposes a predominantly Palaeozoic succession. At a number of localities in northern Novaya Zemlya, Devonian carbonates within this succession contain solid bitumen.The Devonian succession was examined in two areas in northern Novaya Zemlya, one on the Barents Sea coast and one on the Kara Sea coast. On the Barents Sea coast, the Early Devonian succession comprises non-marine and near-shore marine siliciclastics which grade upward into shallow-marine platform carbonates. These facies are succeeded by Middle Devonian deeper-water mid-outer shelf black mudstones and shales. The Late Devonian succession consists of early Frasnian continental conglomerates and sandstones, and middle-Frasnian to Famennian shallow-marine platform carbonates.On the Kara Sea coast, the entire Devonian succession is dominated by shallow-marine carbonates, with deeper-water carbonate turbidites and shales in the late Lochkovian, marine siliciclastics in the Eifelian and non-marine sandstones in the early Frasnian.The Devonian palaeogeography of Novaya Zemlya is characterised by a deepwater slope-basin in the centre and east, and a shallow-marine carbonate platform in the south, west and north. Extensional tectonism influenced deposition of the Devonian succession, particularly during the late Givetian to early Frasnian.Solid bitumen is confined to carbonate facies and is most abundant in Early Devonian strata, occurring mainly within syn-tectonic fractures and associated secondary pore systems. In the mature Timan-Pechora Basin to the south of Novaya Zemlya, Devonian strata are an important element in the petroleum system; however, in the less-explored deep basins of the eastern Barents Shelf to the west of Novaya Zemlya, equivalent Palaeozoic strata are generally deeply buried beneath younger successions. Information from Novaya Zemlya therefore provides an important insight into the likely nature of successions and petroleum systems offshore. © 2010 The Authors. Journal compilation © 2010 Scientific Press Ltd.
Dolgal A.,Mining Institute
14th EAGE International Conference on Geoinformatics - Theoretical and Applied Aspects, Geoinformatics 2015 | Year: 2015
The conception of the hidden information about sources of gravitational anomalies as joint fragment of the true model and disturbing objects has been introduced. It is shown, that in the presence of uncertainty inherent to inverse problems, the limit of possibilities of algorithms for constructing the best estimates of model parameters of sources is to maximize the guaranteed volume of hidden information. It is proved that optimal solutions of inverse problems, which realized the known conception of the minimax, have the maximum of the informativity (in this sense). Technologies of building of sufficiently representative subsets of feasible solutions, already tested on another class of inverse problems, have been offered. They have been fixed in the basis of minimax algorithms for solving inverse problems of the ore type. The examples of application of minimax algorithms of the solution of gravity inverse problems are given in the article.
Vujic S.,Mining Institute |
Hudej M.,Mining and Construction Company |
Miljanovic I.,University of Belgrade
Archives of Mining Sciences | Year: 2013
This paper discusses the application of the PROMETHEE model and the results achieved in practice, following the example of the multi-criteria selection of the technological system at the Majdan III clay mineral raw material open pit mine of the Potisje Company, Republic of Serbia. After the introduction comments, reasons are explained for selecting the new technological system, conditions and limitations for the seven alternative solutions considered are described, mathematical foundation for the PROMETHEE method and a multi-criteria model of the problem in question are presented. The solution with the following structure was ranked first and accepted by the Company management as the best: Bucket chain excavator - Conveyor belts - Spreader (ECS), alongside a decision is made on the acquisition of machinery and system construction. The system was put into operation in 2000. The experience and the data accumulated in the previous twelve years confirm that the decision made on the application of the ECS technology was just, and the conclusion lists the benefits achieved.