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Central Serbia
The influence of composition and age of municipal solid waste on its compaction (Bosnian)
Pantic, Jovana Jankovic (Faculty of Mining and Geology Belgrade, Ðušina) | Rakic, Dragoslav (Faculty of Mining and Geology Belgrade, Ðušina) | Ikodinovic, Irena Basaric (Faculty of Mining and Geology Belgrade, Ðušina) | Ðuric, Tina (Faculty of Mining and Geology Belgrade, Ðušina)
The PDF file of this paper is in Bosnian. _ Abstract Beside that it is possible to use the sanitary waste as raw material, landfilling is still the most wide used technique in Serbia. Although that landfilling – according to the waste hierarchy – is treated as an unfavourable solution, it, however, enables systematic data collection, which can be commented as practice improvement, when compared to old dumps. Mechanical reconstitution of municipal solid waste by compaction represents one of the elementary methods for waste’s treatment. The influence of composition and age of municipal solid waste on the parameters achived by Proctor’s test (dry unit weight and optimal moisture content) will be commented in the paper. For that purpose, results for samples prepared from landfill in Plandište (cca 10 years old) and from Ada Huja landfill in Belgrade (about 40 years old) will be compared. Thus, by preparing artificial samples in laboratory conditions, the importance of this property will be presented for the purpose of optimization of landfill’s area. Moreover, the paper will give a criteria for determining the composition for preparing samples for two landfills with different age.
SPE Disciplines: Health, Safety, Environment & Sustainability > Environment > Waste management (1.00)
Geotechnical conditions for the construction of the multipurpose ventilation shaft No. 3 “Trebevicka” (km 5+522,505) for the I line of the Belgrade metro (Bosnian)
Corluka, Stevan (Mining Institute, Belgrade) | Jankovic, Slavica (Mining Institute, Belgrade) | Živanovic, Miroljub (Mining Institute, Belgrade) | Miladinovic, Tanja (Mining Institute, Belgrade) | Živanovic, Nikola (University of Belgrade, Belgrade)
ABSTRACT The first phase of the first line of the Belgrade metro, with a total length of 21.2 km, is divided into 5 sections with relatively similar geological properties. These are the Makiš, Banovo brdo, Sava alluvium, Center and Danube alluvium sections. Shaft no. 3 "Trebevićka", which belongs to the Banovo brdo section, consists of a shallowly buried building, a vertical shaft and a horizontal connecting corridor. The paper will present the results of field investigations and laboratory tests with recommendations for the construction of the "Trebevićka" ventilation shaft.
Measurement and modeling of thermal conductivity of loess at the location of the Airport "Nikola Tesla" in Surcin
Božovic, Nikola (Institute for Materials Testing, Belgrade) | Krstic, Marija (Institute for Materials Testing, Belgrade) | Todorovic, Goran (University of Belgrade) | Gospavic, Radovan (University of Belgrade) | Marjanovic, Milica Mirkovic (Institute for Materials Testing, Belgrade) | Ilic, Snežana (Institute for Materials Testing, Belgrade) | Kijanovic, Aleksandar (Institute for Materials Testing, Belgrade)
Abstract The thermal conductivity of a material is the parameter that is most reliably determined experimentally. The problem of determining the thermal conductivity in the soil is greater because the soil is heterogeneous, so for the same soil this parameter may be different depending on their physical characteristics. Therefore, it is necessary to adopt an appropriate model for describing the thermal conductivity of the soil for a particular location after the necessary tests are performed. This paper is based on experimental measurements of soil thermal conductivity as a function of moisture content in the area of the "Nikola Tesla" Airport construction site in Surčin and the adoption of one of the existing theoretical models that would satisfactorily describe changes in thermal conductivity. Based on the obtained results of experimental research, a two-parameter fitting of the measured values of thermal conductivity of the soil was performed on the Côté-Konrad model, which proved to be reliable and the simplest to describe the thermal properties of loess in the area of Belgrade.
Country:
- North America > United States (0.29)
- Europe > Serbia > Central Serbia > Belgrade > Belgrade (0.25)
Abstract To date, much research has been conducted in the field of the application of fly ash in road construction. Particular attention is paid to the effects of fly ash on soil stabilization. The results of the research show that self - binding fly ash is an efficient and economical stabilizing material for various applications in construction. The aim of this paper is to investigate the efficiency of stabilization of fine-grained soil with fly ash. This paper presents the results of the laboratory test for stabilization of loess with fly ash, which was conducted in August-September 2021 in the Laboratory for Roads and Geotechnics, at the IMS Institute in Belgrade. The materials used are ash from the heating plant "Energetika" doo. from Kragujevac and loess from the project "Nikola Tesla" airport in Surcin.
ash content, casing and cementing, cement chemistry, cement formulation, cement property, Coal Mining, energetika, europe government, experiment, fly ash, geotechnic isrm specialized conference 2022, heating plant, jovan br, kragujevac, loess, macedonian association, metals & mining, serbia government, stabilization, Symposium, uniaxial strength, Upstream Oil & Gas
Genre:
- Research Report > New Finding (0.67)
- Research Report > Experimental Study (0.67)
Industry:
- Materials > Metals & Mining > Coal (0.47)
- Transportation > Infrastructure & Services (0.35)
- Energy > Oil & Gas > Upstream (0.31)
SPE Disciplines: Well Drilling > Casing and Cementing > Cement formulation (chemistry, properties) (1.00)
Tradition of rock mechanics in Macedonia
Jovanovski, Milorad (University Ss. Cyril and Methodius in Skopje) | Gapkovski, Naum (University Ss. Cyril and Methodius in Skopje) | Peshevski, Igor (University Ss. Cyril and Methodius in Skopje) | Papic, Jovan Br. (University Ss. Cyril and Methodius in Skopje)
Abstract More than 70 years have passed since establishing the Chair of Soil Mechanics, Foundation Engineering and Geology at the Technical Faculty in Skopje; exactly 71 years since the application of the radial jack testing method for the very first time in the world, and more than half of century after the Second Congress of International Society for Rock Mechanics, held in Belgrade in 1970. Having this in a mind, as a tribute to these important events, some data about tradition of rock mechanics in Macedonia are presented, as well as contributions of experts from the region of Former Yugoslavia to the development of rock mechanics worldwide. Facts about scientific and teaching tradition, first-time-ever application of rock testing methods, and some rare phenomenons – part of the world geological heritage, are underlined. Beside this, the idea is to ensure applicable engineering politics in the region and to contribute to the promotion of enlarging the rock mechanics community.
Engineering, europe government, faculty, geotechnic, geotechnic isrm specialized conference 2022, geotechnical engineering, Institute, jovan br, Jovanovski, macedonia government, macedonian association, passive seismic, Reservoir Characterization, reservoir geomechanics, rock mechanic, seismic surveying, serbia government, skopje, Symposium, University, Upstream Oil & Gas, Wellbore Design
Country:
Industry:
- Materials (1.00)
- Energy > Oil & Gas > Upstream (1.00)
- Government (0.68)
Oilfield Places: North America > United States > Alaska > North Slope Basin > Western North Slope > Colville River Field > Alpine Field > Kingak Formation (0.94)
SPE Disciplines:
The possibility of application of handheld devices for determining soil resistance to erosion processes of forest ecosystems (Serbian)
Živanovic, Nikola (University of Belgrade, Belgrade) | Roncevic, Vukašin (University of Belgrade, Belgrade) | Cebašek, Vladimir (University of Belgrade, Belgrade) | Rupar, Veljko (University of Belgrade, Belgrade) | Corluka, Stevan (Mining Institute Ltd. Belgrade, Belgrade) | Polovina, Siniša (University of Belgrade, Belgrade)
The PDF file of this paper is in Serbian. _ Abstract Soil erosion is the most prevalent form of soil degradation both in the world and in Serbia. Degraded forest ecosystems do not provide sufficient soil protection and often large areas are affected by erosion processes. Shear stress plays an important role in assessing soil resistance to erosion processes. The Study area is located in the southwestern part of Belgrade (Serbia), whose areas under the forest are exposed to intense erosion processes. The entire area is affected by gullies and shallow landslides.13 profiles on gullies were selected, where soil resistance was measured with handheld devices, at three points along the profile (left bank, gully, right bank) and at the two depths each. Handheld devices were chosen for field measurements: pocket shear vane (Eijkelkamp model M1.14.10.E) and pocket (hand) static penetrometer (Eijkelkamp model M1.06.03.E).The paper presents mechanical parameters measured with handheld devices with a range of values of soil shear strength τ = 11.58 – 172.42 kN∙m and penetration resistance R = 159.36 – 441.30 kN∙m.A statistical dependence was established between the values obtained by shear vane and penetrometer measurements, with a correlation coefficient of r = 0.65 and a determination coefficient of r = 0.42.The established differences in the values of soil shear resistance, at the selected measurement points, as well as the established correlation, indicate to the possible application of handheld devices for determining the soil resistance of forest ecosystems to erosion processes.
Artificial Intelligence, Belgrade, catena, Erosion process, europe government, evolutionary algorithm, forest ecosystem, geotechnic isrm specialized conference 2022, handheld device, jovan br, macedonian association, machine learning, penetration resistance, resistance, serbia government, soil & tillage research, soil resistance, Symposium, united states government, Upstream Oil & Gas
Country:
- North America > United States (0.93)
- Europe > Serbia > Central Serbia > Belgrade > Belgrade (0.25)
SPE Disciplines:
Technology:
After months of quarantine, the University of Belgrade, Serbia, celebrated the official launching of the SPE Student Chapter on 18 June. Jean-Marc Dumas, SPE regional director for Europe and the special guest of the event, congratulated the chapter on its launch and delivered an inspirational speech. Although there were restrictions in the number of students who could attend in person due to the measures invoked by the COVID-19 pandemic, the event was streamed live on the chapter's social networks for all interested students to take part, and the celebration was a success. The rector and vice-rector of the university, the dean of the Faculty of Mining and Geology, professors, and several professionals from the industry joined the launch. The chapter plans to host events and projects in the future benefitting students.
Industry:
- Health & Medicine > Therapeutic Area > Infections and Infectious Diseases (0.31)
- Health & Medicine > Therapeutic Area > Immunology (0.31)
- Health & Medicine > Epidemiology (0.31)
ABSTRACT In present paper authors analyze the coal cutting force under the effect of the main geomechanical parameters: unit weight, compressive strength, cohesion and angle of internal friction. Analysis was conducted for the case study of Kovin coal mine, near Belgrade (Serbia), where underwater exploitation of lignite takes place. Performed research consisted of two parts: experimental and numerical. Experimental part included extensive laboratory geomechanical analysis of 48 samples taken from the field in order to determine values of the main geomechanical factors and areal cutting force by method of Orenstein and Koppel. Numerical part involved thorough statistical analysis of the obtained laboratory results, including ANOVA test and multiple polynomial analysis. Results obtained indicate strong effect of shear strength on coal cutting force, while unit weight and compressive strength are rated as statistically insignificant. A separate model for estimation of areal cutting forces is developed, as a nonlinear function of the examined geomechanical factors, which represents the novelty in coal geomechanics. 1 INTRODUCTION Geological exploration works in Serbia, performed until the end of 20th century, confirmed significant coal resources: there are 46 coal basins in Serbia, 13 of them are with hard coal, while brown coal (lignite) is found in 33 basins (Vujic, 2014). Exploration of coal is performed in 13 basins with lignite (11 basins) and with hard coal (2 basins), mostly by surface mining, with annual production of approximately 0.6-1.1 million tones. Estimated coal resources in Serbia at the end of 20th century were 22.6 billion tones, which is the reason why coal exploitation still represents the primary source for production of electricity in Serbia, i.e. approximately 70% of electricity production comes from thermal power plants which use coal as their fuel: TE Kolubara, TE Kostolac A, TE Kostolac B, TE Morava, TENT A and TENT B. Apart from this, coal is still used by many households as a heating material through combustion during the winter period. These supplies come from the Kolubara, Kostolac and Kovin coal basin.
Industry:
- Materials > Metals & Mining > Coal (1.00)
- Energy (1.00)
SPE Disciplines:
ABSTRACT: The largest part of the hilly Belgrade area is built of Neogene complex of clayey deposits. Therefore, every engineering intervention in clays calls for full attention and responsibility on the part of the investigators, especially when it's a sufficiently known that physical and mechanical properties of soil vary and weaken in time and in contact with water. Using the experiences of the expert team from a Department of Geotechnics of the Faculty of Mining and Geology and the results obtained from a few very significant underground construction projects in Belgrade clayey complex, this paper confirms a well known fact that interaction between mineral fragments and fluids represents the most important factor which controls decrease of soil shear strength. In extreme cases, the shear strength can be reduced to approximately a half or even a third and that may result in disastrous consequences, unless this particular problem is realized and solved in time. INTRODUCTION A knowledge of shear strength of soil is an indispensable condition for successful designing and realization of each construction, whether it is a building, a mining structure or a structure of any kind, which can be leaned on and/or buried in a soil. Determination of these parameters is very important and a complicated task. The major reason for these problems is the most complex nature of soil construction, which represents, at the same time, the reflection of geological past and contemporary geological and anthropological processes and phenomena. Shear strength of soil and even its residue, so-called residual strength, became an object of interest for a great number of expert teams worldwide. Skempton (1959, 1967, 1985) gave a significant contribution in that particular field with his remarkable work, which considered construction problems in London clay deposits of different age and strength (consolidation ratio).
Belgrade, belgrade area, characteristic, clayey complex, clayey deposit, clayey marl, clayey soil, construction, deposit, faculty, geology, interaction, internal friction, marly clay, montmorillonite, Reservoir Characterization, shear strength, Skempton, strength, Upstream Oil & Gas, water content, Wellbore Design, wellbore integrity
SPE Disciplines:
ABSTRACT: Many unstable slopes with active or potentially active slides are limiting factors in urban planning, and urban, traffic and other development on the Danube river bank (right) in Yugoslavia from Belgrade to the state border. Because of complex lithological structures, neotectonics, erosion and other current geodynamical processes in the area, a multidisciplinary approach to investigations is required and particularly needed for any local remedial or protection measures. Our numerous papers on engineering geological investigations on unstable slopes clearly show that we have not enough experience in the determination of groundwater table fluctuations, although its presence is one of the key active factors in slope stability. This paper puts an emphasis on the hydrogeological activities and methodology of a reliable, quality determination of the groundwater regime in the landslide body as a basis for geotechnical modelling of slope stability, all for the purpose of planning the Golden Hill farm estate development near the town of Smederevo, Yugoslavia, i.e. preparing optimum measures of protection. INTRODUCTION For the purpose of determining geotechnical parameters for local land development, vineyard raising, construction of access communications, subsidiary buildings, an optimum irrigation system and drainage systems in the overhumid zones in the area of Golden Hill farm estate near Smederevo, which is fully situated in the central part of the "Plavinac" landslide, a program of specific, dedicated, hydrogeological and engineering geological investigations, in the office and in the field, was first defined and then implemented. In the final phase the ground stability was to be modelled using different groundwater tables, and protection measures of the level of a detailed design were to be planned in order to arrange and develop the land on an area of about 31 hectares.
aquifer, banking & finance, Belgrade, borehole, drainage system, ground section, ground stability, groundwater regime, groundwater table, groundwater table fluctuation, hydrogeological investigation, investigation, landslide, modern slope stability analysis, phreatic aquifer, precipitation, real estate, Reservoir Characterization, sea level, smederevo, stability, Water Structure
Industry:
- Banking & Finance > Real Estate (0.54)
- Water & Waste Management (0.48)
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