Dejan Petrović | Tehnicki fakulet Bor (original) (raw)
Papers by Dejan Petrović
International Journal of Injury Control and Safety Promotion, 2020
The study presented here analyzes mining accidents and fatal injuries in Serbian underground coal... more The study presented here analyzes mining accidents and fatal injuries in Serbian underground coal mines over a period of 50 years, in order to assess the effectiveness of legislation changes in the overall safety of work environment. Two distinct periods, prior to 2000 and after 2000 were compared. The data from the period after 2000 were further analyzed to provide better understanding of the results. In order to assess the overall state of safety in Serbian mines, the data on fatal injuries were also compared to the international data. It was found that the legislative changes are more easily accepted by the common workers than by the mine management. Consequently, the key recommendation for the safety of coal mine companies in Serbia is the investment in the new technology. Additionally, mine management should be in the focus of the mining inspection with a stronger penal policy regarding mine safety neglect.
Podzemni radovi, 2015
Dominant ore bodies in "Jama Bor" underground mine in last few years, from the aspect of producti... more Dominant ore bodies in "Jama Bor" underground mine in last few years, from the aspect of production and engaged resources, have a common characteristic that after being mined out, excavated areas remained open. These are following ore bodies: T, T1 and T2. Mining in ore body T had been ended two years ago and the stope was supposed to be backfilled after the end of excavation. However, process of backfilling did not start yet. Applied mining method in currently active ore bodies, T1 and T2, is pillar mining in horizontal slices, with leaving open voids after the end of extraction. Existence of voids in underground mines is always a challenge, regarding stability and safety. In considerations of stability of open stopes in "Jama Bor", there are several key factors: rock mass properties, stope geometry, support properties and interaction between installed support and surrounding rock. Contemporary approach applied in each phase of the process, including determination of rock properties, mine design, mining operations, support installation and monitoring of stope stability during and after the excavation, enables accurate and reliable defining of stope stability. Also, such approach enables early detection of possible endangerments in stope stability, thus providing possibility for prevention and securing of endangered zones. Since the future of underground mining in RTB Bor is related deep lying ore deposits, bellow current operations, importance of their stability is even bigger.
Use the thermovision in industry allow monitoring the system without stops operation of machinery... more Use the thermovision in industry allow monitoring the system without stops operation of machinery and equipments, in very short time period reveals location in the system where damages may occur. Thermal imaging analysis can be quickly and precisely find the critical parts of the system that can produce failure of the same.. In this paper are shown results of thermal analysis wheel excavator construction. The parts of the construction where the highest tension occur are determined by the thermal analysis. Thermal imaging analysis gives a general picture of the distribution of tension examined the structure on which the measuring tape to measure the intensity and possible direction of tension action.
MAIN TOPICS • Protection and preservation of natural resources • Technologies, wastes recycling a... more MAIN TOPICS • Protection and preservation of natural resources • Technologies, wastes recycling and the environment • Soil and water conservation engineering • Energy efficiency, environment and climate • Nutrition and health • Agriculture: agribusiness, agroengineering and organic food production • Urban ecology • Water supply and protection • Ecological management (Low, economy and standardization) • Environmental impact assessment • Ecological ethics and ecological education • Eco tourism and sustainable development • Emergency environmental situation and capacities • Preventive medicine and ecology
Expert Systems with Applications, 2014
The systematic maintenance of mining machinery and equipment is the crucial factor for the proper... more The systematic maintenance of mining machinery and equipment is the crucial factor for the proper functioning of a mine without production process interruption. For high-quality maintenance of the technical systems in mining, it is necessary to conduct a thorough analysis of machinery and accompanying elements in order to determine the critical elements in the system which are prone to failures. The risk assessment of the failures of system parts leads to obtaining precise indicators of failures which are also excellent guidelines for maintenance services. This paper presents a model of the risk assessment of technical systems failure based on the fuzzy sets theory, fuzzy logic and min-max composition. The risk indicators, severity, occurrence and detectability are analyzed. The risk indicators are given as linguistic variables. The model presented was applied for assessing the risk level of belt conveyor elements failure which works in severe conditions in a coal mine. Moreover, this paper shows the advantages of this model when compared to a standard procedure of RPN calculating-in the FMEA method of risk assessment.
Mining and Metallurgy Engineering Bor, 2013
This paper presents a design and parameters of the new variant of sublevel stopping method. The p... more This paper presents a design and parameters of the new variant of sublevel stopping method. The proposed new variant is the result of combination the theoretic considerations, field experience using the application of similar methods and researches on models. The idea of new design was to include most of advantages from several variants of sublevel stopping. The new variant is called "Semi-level stopping" [1]. Determination of optimal parameters for this method was performed using physical similarity model.
Published by, 2010
Page 40. MINING AND METALLURGY INSTITUTE BOR YU ISSN: 1451-0162 COMMITTEE OF UNDERGROUND EXPLOITA... more Page 40. MINING AND METALLURGY INSTITUTE BOR YU ISSN: 1451-0162 COMMITTEE OF UNDERGROUND EXPLOITATION OF THE MINERAL DEPOSITS UDK: 622 UDK: 622: 681.51 (045)= 20 Dejan Petrović*, Zvonko ...
Mathematics, 2022
The risk assessment of engineering systems represents an important part of the quality of service... more The risk assessment of engineering systems represents an important part of the quality of service and dependability. The existing methods for risk evaluation use crisp sets for rating partial indicators’ proposition and their cumulative products as an overall indicator. In this paper, existing FMEA and FMECA methods have been improved using the fuzzy expert system for calculating the risk priority number. The application of fuzzy logic allows the use of linguistic descriptions for risk analysis. In this way, the state of the system in terms of risks and consequences is better described. The settings of the fuzzy systems are based on the application of two multi-criteria decision-making methods. The AHP method was used to define the mutual relationship of the impact of partial indicators (occurrence, severity, and detectability) on risk. In this way, subjectivity in risk assessment is reduced. In the composition of the fuzzy model, the TOPSIS method is introduced to reduce the dissip...
Rudarski radovi, Bor, 2012
Otkopavanje u rudnom telu Tilva Roš obustavljeno je 2007. godine usled prodora vode i mulja sa po... more Otkopavanje u rudnom telu Tilva Roš obustavljeno je 2007. godine usled prodora vode i mulja sa površinskog kopa. Preosrale rudne rezerve procenjene su na 2,5 miliona tona rude. U ovom radu daju se razmatranja mogućnosti otkopavanja ovih rezervi. Rudno telo Tilva Roš je veoma specifično. Iznad njega je stari površinski kop, a ispod njega masivno rudno telo Borska reka, koje se smatra dugoročnom perspektivom podzemne eksploatacije rude bakra u Boru. U slučaju nastavka rudarskih radova, potrebno je posvetiti posebnu pažnju osiguranju podzemnih prostorija i izolaciji rudarskih radova od površinskih voda i mulja. Ključne reči: podzemna eksploatacija, borska Jama, sigurnost, prodor vode. * Univerzitet u Beogradu, Tehnički fakultet u Boru ** Ovaj rad je deo projekta broj TR 33038 koji finansira Ministarstvo za prosvetu i nauku Republike Srbije, a u okviru projekta "Usavršavanje tehnologija eksploatacije i prerade rude bakra sa monitoringom životne i radne sredine u RTB Bor Grupa"
Mining and Metallurgy Engineering Bor, 2015
When a new mining method is designed, it is necessary to define the optimal parameters of method.... more When a new mining method is designed, it is necessary to define the optimal parameters of method. Applicability of a method in certain conditions is tested through determination of each relevant method parameter. Their values have to be acceptable. This paper presents a case study for analyses of parameters related to the ore body Borska Reka. The analysis was focused on determination the share of costs in the final price, ore value and copper production economy.
System Safety: Human - Technical Facility - Environment
Artificial neural networks (ANN) are a powerful tool in the decision-making process, especially i... more Artificial neural networks (ANN) are a powerful tool in the decision-making process, especially in solving the complex problems with a large number of input data. The possibility to predict the work-related injuries in the underground coal mines, based on application of the neural networks, is analyzed in this work. the input data for the network were obtained based on a survey of 1300 respondents. After analyzing the input data influence on the network output, 14 most influential inputs were selected, with help of which the network correctly predicted whether the worker would suffer the work-related injury or not, with 80% precision. The two models were developed, based on the multilayer perceptron (MLP) and radial basis function (RBF) networks. The two models’ results were compared to each other. The sensitivity analysis was used to select the most influential parameters, like mine, age of miners, as well as their work experience. The parameters were further analyzed by use of the...
System Safety: Human - Technical Facility - Environment
The mining industry in Serbia has an important place in the country's economic development. B... more The mining industry in Serbia has an important place in the country's economic development. Bearing in mind that the number of injuries that occur in the mining industry is unacceptably high, occupational safety and health is a challenge that existing and future mines will have to deal with. Studying injuries in mining, it was noticed that injuries requiring an absence from work for more than three days (especially fatal ones) are diametrically different in relation to the cause and manner of events related to injuries for which an absence from work is not necessary. In this research, authors focused on injuries that were characterized as ones requiring an absence from work. The statistical analysis of work-related injuries in mining is presented, as well as analysis of the direct causes of injuries, which are described as unsafe conduct of employees, unsafe conduct of company's management and/or unsafe working environment. In relation to classification of causes of injuries...
Symmetry
The main goal of this research was the development of an algorithm for the implementation of nega... more The main goal of this research was the development of an algorithm for the implementation of negative risk parameters in a synthesis model for a risk level assessment for a specific machine used in the mining industry. Fuzzy sets and fuzzy logic theory, in combination with statistical methods, were applied to analyze the time picture state of the observed machine. Fuzzy logic is presented through fuzzy proposition and a fuzzy composition module. Using these tools, the symmetric position of the fuzzy sets with regard to class was used, and the symmetric fuzzy inference approach was used in an outcome calculation. The main benefit of the proposed model is being able to use numerical and linguistic data in a risk assessment model. The proposed risk assessment model, using fuzzy logic conclusions and min–max composition, was used on a mobile crushing machine. The results indicated that the risk level of the mobile crushing machine was in the “high” category, which means that it is neces...
Podzemni radovi
Mining is often the subject of a study of safety and health at work as one part of industry that ... more Mining is often the subject of a study of safety and health at work as one part of industry that carries the greatest risk of injury. The most of these analyses are directed on studying the method of injuries of workers and procedures that can prevent injury. Financial expenditures resulting from injuries of workers in Bogovina coalmine which occurred in 2016 are analyzed in this paper. Injury costs were processed based on the available data: compensations of the insurance companies to the injured workers, gross salaries of injured workers and similar. Within these data, the "cost of one work day lost" (COWDL) is defined. Comparison of the COWDL, based on qualification structure of the injured worker and the severity of the injuries, was performed. Also, an impact analysis of expenditures related to indemnity related to injuries at work to mine operational costs were carried out.
Acta Montanistica Slovaca
This paper is an overview of dumping operations on High Slope Waste Dump at Veliki Krivelj open p... more This paper is an overview of dumping operations on High Slope Waste Dump at Veliki Krivelj open pit copper mine, RTB Bor, Serbia. The High Slope Waste Dump in Bor is the highest single slope waste dump in the world with the slope height of 405 m. The paper gives the basics and limitations of the designed dumping technology, the redesigned technology, gives an overview of the 13 year long operation and gathered experiences and addresses the main issues of dumping operations in high slope conditions as well as the present condition of the High Slope Waste Dump.
Podzemni radovi, 2014
Ore body Borska Reka in Jama Bor underground mine has been a challenge for experts in underground... more Ore body Borska Reka in Jama Bor underground mine has been a challenge for experts in underground mining for many years. Specific properties of this ore body, such as great depth, huge ore reserves, low ore grades, infrastructure at ground surface above the deposit, along with variation of metal prices, disable application of traditional and previously applied mining methods. This paper presents results of researches related to design of new mining method, from the group of induced caving methods, and possibilities for application of such method in ore body Borska Reka, along with calculation of main method parameters.
Mining and Metallurgy Engineering Bor, 2013
In the current conditions for global underground mining, with the new ore deposits lying deeper a... more In the current conditions for global underground mining, with the new ore deposits lying deeper and deeper, with reduced ore grades, the bulk mining is a necessity. Only high production level provides chances for positive economic results of underground mining. The high productive mining methods enable significant reducing of costs per ton of excavated ore. Different variants of block methods belong to this group of bulk mining methods. One of them, named the semi-level caving, is present in this paper, with analysis of its block and drawbells stability.
International Journal of Injury Control and Safety Promotion, 2020
The study presented here analyzes mining accidents and fatal injuries in Serbian underground coal... more The study presented here analyzes mining accidents and fatal injuries in Serbian underground coal mines over a period of 50 years, in order to assess the effectiveness of legislation changes in the overall safety of work environment. Two distinct periods, prior to 2000 and after 2000 were compared. The data from the period after 2000 were further analyzed to provide better understanding of the results. In order to assess the overall state of safety in Serbian mines, the data on fatal injuries were also compared to the international data. It was found that the legislative changes are more easily accepted by the common workers than by the mine management. Consequently, the key recommendation for the safety of coal mine companies in Serbia is the investment in the new technology. Additionally, mine management should be in the focus of the mining inspection with a stronger penal policy regarding mine safety neglect.
Podzemni radovi, 2015
Dominant ore bodies in "Jama Bor" underground mine in last few years, from the aspect of producti... more Dominant ore bodies in "Jama Bor" underground mine in last few years, from the aspect of production and engaged resources, have a common characteristic that after being mined out, excavated areas remained open. These are following ore bodies: T, T1 and T2. Mining in ore body T had been ended two years ago and the stope was supposed to be backfilled after the end of excavation. However, process of backfilling did not start yet. Applied mining method in currently active ore bodies, T1 and T2, is pillar mining in horizontal slices, with leaving open voids after the end of extraction. Existence of voids in underground mines is always a challenge, regarding stability and safety. In considerations of stability of open stopes in "Jama Bor", there are several key factors: rock mass properties, stope geometry, support properties and interaction between installed support and surrounding rock. Contemporary approach applied in each phase of the process, including determination of rock properties, mine design, mining operations, support installation and monitoring of stope stability during and after the excavation, enables accurate and reliable defining of stope stability. Also, such approach enables early detection of possible endangerments in stope stability, thus providing possibility for prevention and securing of endangered zones. Since the future of underground mining in RTB Bor is related deep lying ore deposits, bellow current operations, importance of their stability is even bigger.
Use the thermovision in industry allow monitoring the system without stops operation of machinery... more Use the thermovision in industry allow monitoring the system without stops operation of machinery and equipments, in very short time period reveals location in the system where damages may occur. Thermal imaging analysis can be quickly and precisely find the critical parts of the system that can produce failure of the same.. In this paper are shown results of thermal analysis wheel excavator construction. The parts of the construction where the highest tension occur are determined by the thermal analysis. Thermal imaging analysis gives a general picture of the distribution of tension examined the structure on which the measuring tape to measure the intensity and possible direction of tension action.
MAIN TOPICS • Protection and preservation of natural resources • Technologies, wastes recycling a... more MAIN TOPICS • Protection and preservation of natural resources • Technologies, wastes recycling and the environment • Soil and water conservation engineering • Energy efficiency, environment and climate • Nutrition and health • Agriculture: agribusiness, agroengineering and organic food production • Urban ecology • Water supply and protection • Ecological management (Low, economy and standardization) • Environmental impact assessment • Ecological ethics and ecological education • Eco tourism and sustainable development • Emergency environmental situation and capacities • Preventive medicine and ecology
Expert Systems with Applications, 2014
The systematic maintenance of mining machinery and equipment is the crucial factor for the proper... more The systematic maintenance of mining machinery and equipment is the crucial factor for the proper functioning of a mine without production process interruption. For high-quality maintenance of the technical systems in mining, it is necessary to conduct a thorough analysis of machinery and accompanying elements in order to determine the critical elements in the system which are prone to failures. The risk assessment of the failures of system parts leads to obtaining precise indicators of failures which are also excellent guidelines for maintenance services. This paper presents a model of the risk assessment of technical systems failure based on the fuzzy sets theory, fuzzy logic and min-max composition. The risk indicators, severity, occurrence and detectability are analyzed. The risk indicators are given as linguistic variables. The model presented was applied for assessing the risk level of belt conveyor elements failure which works in severe conditions in a coal mine. Moreover, this paper shows the advantages of this model when compared to a standard procedure of RPN calculating-in the FMEA method of risk assessment.
Mining and Metallurgy Engineering Bor, 2013
This paper presents a design and parameters of the new variant of sublevel stopping method. The p... more This paper presents a design and parameters of the new variant of sublevel stopping method. The proposed new variant is the result of combination the theoretic considerations, field experience using the application of similar methods and researches on models. The idea of new design was to include most of advantages from several variants of sublevel stopping. The new variant is called "Semi-level stopping" [1]. Determination of optimal parameters for this method was performed using physical similarity model.
Published by, 2010
Page 40. MINING AND METALLURGY INSTITUTE BOR YU ISSN: 1451-0162 COMMITTEE OF UNDERGROUND EXPLOITA... more Page 40. MINING AND METALLURGY INSTITUTE BOR YU ISSN: 1451-0162 COMMITTEE OF UNDERGROUND EXPLOITATION OF THE MINERAL DEPOSITS UDK: 622 UDK: 622: 681.51 (045)= 20 Dejan Petrović*, Zvonko ...
Mathematics, 2022
The risk assessment of engineering systems represents an important part of the quality of service... more The risk assessment of engineering systems represents an important part of the quality of service and dependability. The existing methods for risk evaluation use crisp sets for rating partial indicators’ proposition and their cumulative products as an overall indicator. In this paper, existing FMEA and FMECA methods have been improved using the fuzzy expert system for calculating the risk priority number. The application of fuzzy logic allows the use of linguistic descriptions for risk analysis. In this way, the state of the system in terms of risks and consequences is better described. The settings of the fuzzy systems are based on the application of two multi-criteria decision-making methods. The AHP method was used to define the mutual relationship of the impact of partial indicators (occurrence, severity, and detectability) on risk. In this way, subjectivity in risk assessment is reduced. In the composition of the fuzzy model, the TOPSIS method is introduced to reduce the dissip...
Rudarski radovi, Bor, 2012
Otkopavanje u rudnom telu Tilva Roš obustavljeno je 2007. godine usled prodora vode i mulja sa po... more Otkopavanje u rudnom telu Tilva Roš obustavljeno je 2007. godine usled prodora vode i mulja sa površinskog kopa. Preosrale rudne rezerve procenjene su na 2,5 miliona tona rude. U ovom radu daju se razmatranja mogućnosti otkopavanja ovih rezervi. Rudno telo Tilva Roš je veoma specifično. Iznad njega je stari površinski kop, a ispod njega masivno rudno telo Borska reka, koje se smatra dugoročnom perspektivom podzemne eksploatacije rude bakra u Boru. U slučaju nastavka rudarskih radova, potrebno je posvetiti posebnu pažnju osiguranju podzemnih prostorija i izolaciji rudarskih radova od površinskih voda i mulja. Ključne reči: podzemna eksploatacija, borska Jama, sigurnost, prodor vode. * Univerzitet u Beogradu, Tehnički fakultet u Boru ** Ovaj rad je deo projekta broj TR 33038 koji finansira Ministarstvo za prosvetu i nauku Republike Srbije, a u okviru projekta "Usavršavanje tehnologija eksploatacije i prerade rude bakra sa monitoringom životne i radne sredine u RTB Bor Grupa"
Mining and Metallurgy Engineering Bor, 2015
When a new mining method is designed, it is necessary to define the optimal parameters of method.... more When a new mining method is designed, it is necessary to define the optimal parameters of method. Applicability of a method in certain conditions is tested through determination of each relevant method parameter. Their values have to be acceptable. This paper presents a case study for analyses of parameters related to the ore body Borska Reka. The analysis was focused on determination the share of costs in the final price, ore value and copper production economy.
System Safety: Human - Technical Facility - Environment
Artificial neural networks (ANN) are a powerful tool in the decision-making process, especially i... more Artificial neural networks (ANN) are a powerful tool in the decision-making process, especially in solving the complex problems with a large number of input data. The possibility to predict the work-related injuries in the underground coal mines, based on application of the neural networks, is analyzed in this work. the input data for the network were obtained based on a survey of 1300 respondents. After analyzing the input data influence on the network output, 14 most influential inputs were selected, with help of which the network correctly predicted whether the worker would suffer the work-related injury or not, with 80% precision. The two models were developed, based on the multilayer perceptron (MLP) and radial basis function (RBF) networks. The two models’ results were compared to each other. The sensitivity analysis was used to select the most influential parameters, like mine, age of miners, as well as their work experience. The parameters were further analyzed by use of the...
System Safety: Human - Technical Facility - Environment
The mining industry in Serbia has an important place in the country's economic development. B... more The mining industry in Serbia has an important place in the country's economic development. Bearing in mind that the number of injuries that occur in the mining industry is unacceptably high, occupational safety and health is a challenge that existing and future mines will have to deal with. Studying injuries in mining, it was noticed that injuries requiring an absence from work for more than three days (especially fatal ones) are diametrically different in relation to the cause and manner of events related to injuries for which an absence from work is not necessary. In this research, authors focused on injuries that were characterized as ones requiring an absence from work. The statistical analysis of work-related injuries in mining is presented, as well as analysis of the direct causes of injuries, which are described as unsafe conduct of employees, unsafe conduct of company's management and/or unsafe working environment. In relation to classification of causes of injuries...
Symmetry
The main goal of this research was the development of an algorithm for the implementation of nega... more The main goal of this research was the development of an algorithm for the implementation of negative risk parameters in a synthesis model for a risk level assessment for a specific machine used in the mining industry. Fuzzy sets and fuzzy logic theory, in combination with statistical methods, were applied to analyze the time picture state of the observed machine. Fuzzy logic is presented through fuzzy proposition and a fuzzy composition module. Using these tools, the symmetric position of the fuzzy sets with regard to class was used, and the symmetric fuzzy inference approach was used in an outcome calculation. The main benefit of the proposed model is being able to use numerical and linguistic data in a risk assessment model. The proposed risk assessment model, using fuzzy logic conclusions and min–max composition, was used on a mobile crushing machine. The results indicated that the risk level of the mobile crushing machine was in the “high” category, which means that it is neces...
Podzemni radovi
Mining is often the subject of a study of safety and health at work as one part of industry that ... more Mining is often the subject of a study of safety and health at work as one part of industry that carries the greatest risk of injury. The most of these analyses are directed on studying the method of injuries of workers and procedures that can prevent injury. Financial expenditures resulting from injuries of workers in Bogovina coalmine which occurred in 2016 are analyzed in this paper. Injury costs were processed based on the available data: compensations of the insurance companies to the injured workers, gross salaries of injured workers and similar. Within these data, the "cost of one work day lost" (COWDL) is defined. Comparison of the COWDL, based on qualification structure of the injured worker and the severity of the injuries, was performed. Also, an impact analysis of expenditures related to indemnity related to injuries at work to mine operational costs were carried out.
Acta Montanistica Slovaca
This paper is an overview of dumping operations on High Slope Waste Dump at Veliki Krivelj open p... more This paper is an overview of dumping operations on High Slope Waste Dump at Veliki Krivelj open pit copper mine, RTB Bor, Serbia. The High Slope Waste Dump in Bor is the highest single slope waste dump in the world with the slope height of 405 m. The paper gives the basics and limitations of the designed dumping technology, the redesigned technology, gives an overview of the 13 year long operation and gathered experiences and addresses the main issues of dumping operations in high slope conditions as well as the present condition of the High Slope Waste Dump.
Podzemni radovi, 2014
Ore body Borska Reka in Jama Bor underground mine has been a challenge for experts in underground... more Ore body Borska Reka in Jama Bor underground mine has been a challenge for experts in underground mining for many years. Specific properties of this ore body, such as great depth, huge ore reserves, low ore grades, infrastructure at ground surface above the deposit, along with variation of metal prices, disable application of traditional and previously applied mining methods. This paper presents results of researches related to design of new mining method, from the group of induced caving methods, and possibilities for application of such method in ore body Borska Reka, along with calculation of main method parameters.
Mining and Metallurgy Engineering Bor, 2013
In the current conditions for global underground mining, with the new ore deposits lying deeper a... more In the current conditions for global underground mining, with the new ore deposits lying deeper and deeper, with reduced ore grades, the bulk mining is a necessity. Only high production level provides chances for positive economic results of underground mining. The high productive mining methods enable significant reducing of costs per ton of excavated ore. Different variants of block methods belong to this group of bulk mining methods. One of them, named the semi-level caving, is present in this paper, with analysis of its block and drawbells stability.