scholarly journals INVESTIGATION OF THE RANDOM VALUE STATISTICAL DISTRIBUTIONS MODELS CHOICE INFLUENCE ON THE MINING OPERATIONS MODELING RESULTS

2021 ◽  
Vol 21 (3) ◽  
pp. 130-137
Author(s):  
A.V. Zatonskiy ◽  
◽  
P.A. Yazev ◽  
Keyword(s):  
Simulation Model ◽  
Mining Machine ◽  
Statistical Distributions ◽  
Mining Operations ◽  
Stochastic Delay ◽  
Uniform Distributions ◽  
Potash Mining ◽  
Mining Enterprise ◽  
Stochastic Parameters ◽  
Similar Simulation

The importance of production planning for improving the performance indicators of a mining enterprise is indicated. The possibility of simulation modeling using for this aim is shown. It is shown that the created model has a large number of stochastic parameters. It is investigated that there is a problem of research lack about the choice influence of the mining modeling results with different statistical distributions. It is known that with an increase in stochastic deviations from the initial parameters, the productivity of queuing systems decreases. Purpose of work is to study this influence with four statistical distributions of a random quantity (uniform, normal, negative bi-nomial and Poisson distribution) for individual operations and their combinations. In addition, it is necessary to determine how much a change in one particular parameter will affect the overall result of the modeling. Materials and methods. In the previously created simulation model, a stochastic delay is added to the time of individual operations. The addition of such a delay with different sta-tistical distributions and with the same mathematical expectation is investigated. The simulation re-sults are compared with each other, for each individual operation the absolute and relative devia-tion of the results is shown. Further, a similar simulation is performed when all the simultaneously selected parameters changing. Result. It is shown that the magnitude of the deviation significantly differs among all deviations. It is shown that for various single changes in operations, the largest and smal-lest deviations can be given by different statistical distributions. To study the joint change with all parameters, 3 modeling scenarios are implemented: all uniform distributions (this case is used now), the scenario with the smallest deviation and the scenario with the largest deviation. It is shown that switching to another scenario leads to a significant change in the simulation. Conclusion. It is con-cluded that the used significant influence of statistical distributions choice to the accuracy of model-ing the operation of the mining machine is shown, especially when they are taken into account to-gether. The results can be used to clarify the influence of individual factors in the simulation model and improve the planning of potash mining operations, for individual mining machines too.

scholarly journals DEVELOPMENT OF A MINING SIMULATION MODEL FOR POTASSIUM ORE MINING PLANNING

2020 ◽  
Vol 20 (4) ◽  
pp. 47-54
Author(s):  
A.V. Zatonskiy ◽  
◽  
P.A. Yazev ◽  
Keyword(s):  
Simulation Model ◽  
Underground Mining ◽  
Limiting Factor ◽  
Mining Operations ◽  
Active Systems ◽  
Mining Enterprise ◽  
General Production ◽  
Multi Agent ◽  
Simulation Results

In this article, we show the importance of potash fertilizers produced by PJSC Uralkali, Berezniki, Perm Territory for agriculture and the economy in general. А process of potas¬sium ore underground mining is described from breaking up moment till transportation to the surface. An importance of production planning for the mining enterprise functioning is substantiated. Various levels of plan-ning, from a general production plan to a weekly and daily plans are described. The problem of such planning at PJSC Uralkali is in using only integral performance indicators, it leads to significant errors. It is proposed to use simulation modeling as a possible solution to the problem. Purpose of work. The purpose of this work is to develop a simulation model of mining operations, from the process of breaking and transporting ore to a conveyor-transport system, and to test model’s applicability for ore mining planning. Since the existing software has a number of limitations in applies to potash mines, a specialized object-oriented library allows modeling queuing systems, multi-agent and active systems is used as a basis for modeling. The limitations and as-sumptions of the model are described. Materials and methods. The model is igned as a determinis-tic automaton. The end point for ore mining process modeling is the transfer of ore to the unloading point, because further transportation of ore is not a limiting factor for mining. Conclusion. The spe-cial states of all objects of the system including mining combine – self-propelled car – unloading point and all possible transitions between them are described. A data from open sources is taken to check the adequacy of the model. Changes in the simulation results are investigated for various in-put parameters in the developed software. The simulation results are of a pulsating character due to the periodic execution of the harvester drive away. A productivity of the combine decreases with an increase in the distance traveled by a self-propelled car. The possibility of transition to a stochas-tic model is investigated. An expected decrease due to an increase in the downtime of the combine is shown. A conclusion about the applicability of the model to improve the quality of planning for un-derground potassium ore mining is made based on obtained data.

CALCULATION OF INDICATORS OF ENVIRONMENTAL IMPACT OF MINING ENTERPRISES ON THE STATE OF THE NATURAL ENVIRONMENT

2021 ◽  
pp. 17-22
Author(s):  
Olha Bohomaz ◽  
◽  
Оlena Zavialova ◽  
Keyword(s):  
Environmental Impact ◽  
Natural Environment ◽  
The State ◽  
Practical Significance ◽  
Mining Operations ◽  
Mining Enterprise ◽  
Physical Fields ◽  
The Impact ◽  
Impact Of Mining ◽  
Specific Impact

Purpose. The aim of the work is to quantify the indicators of the environmental impact of mining enterprises on the state of the natural environment during the operation of a mining enterprise and after its liquidation. Method. The paper uses a computational and analytical research method. Results. Based on the calculations performed, it was established that the specific assessment of the environmental impact on the biosphere components of the Mining Enterprise PJSC "MM "Pokrovskoe" for the entire estimated period of the mine's existence: lithosphere – 0.071; hydrosphere – 0.02; atmosphere – 0.77; biota – 0.009; physical fields – 0.13. After the liquidation of the mine, due to the termination of coal mining operations from methane-free coal seams, the absence of emergency gas emissions, as well as a decrease in noise and heat pollution, the specific impact on the atmosphere (0) and physical fields (0.0004) is significantly reduced, but at the same time, the impact on the hydrosphere (0.26) and lithosphere (0.72) significantly increases, which is associated with changes in the hydrological regime of water and the deterioration of mine discharges of water quality in the hydrographic network due to pumping mine effluents to the daytime surface, with the dry method closing the mine, and waterlogging of the territory with a wet and combined method of closing the mine. The indicator of specific impact on the biota (0.009) does not change. Scientific novelty. A methodology for calculating indicators of the environmental impact of mining enterprises on the state of the natural environment is proposed. Practical significance. The obtained indicators of environmental impact on the components of the biosphere can serve as a basis for developing measures to reduce the negative manifestations of mining enterprises on the state of the natural environment. Key words environmental risk, mining enterprise, biosphere components, environmental impact.

scholarly journals Operational Control of the Feed of the Harvester

2019 ◽  
Vol 105 ◽  
pp. 01009
Author(s):  
Sergey Kubrin ◽  
Konstantin Kopylov
Keyword(s):  
Operational Control ◽  
Coal Seams ◽  
Mining Operations ◽  
Technological Processes ◽  
Mining Enterprise ◽  
Geological Conditions ◽  
Operational Management ◽  
Mining Coal ◽  
The Right ◽  
Planning Production

Comparison of normative and actual indicators on mining testifies to inefficient work of the excavating equipment. The results of the correlation analysis of the speed of movement of the harvester relative to the section of the support with the readings of methane sensors revealed a significant dependence. When conducting mining operations in complex geological conditions at great depths, a joint step-by-step carrying out of various technological processes is required to ensure the preparation, opening and excavation of reserves and the creation of safe conditions for mining coal seams. At the same time, efforts should be made to minimize time, human and energy resources. In this regard, of particular importance is the right choice of the program of operational management of technological processes of mining, monitoring the implementation of technological operations for the timely detection of deviations from the selected mode, adjustment of the established current modes of operation of technological processes and the development, if necessary, measures aimed at reducing the risks of accidents. A promising direction of solving this problem is the use of modeling methods. The developed models of technological processes of the mining enterprise will allow planning production and supporting decision-making in the implementation of operational management.

scholarly journals Annual production enhancement at deep mining

2019 ◽  
Vol 123 ◽  
pp. 01043 ◽  
Author(s):  
Nataliia Shvaher ◽  
Tetiana Komisarenko ◽  
Serhii Chukharev ◽  
Svitlana Panova
Keyword(s):  
Iron Ore ◽  
Underground Mine ◽  
Annual Production ◽  
Direct Proportion ◽  
Operating Life ◽  
Mining Operations ◽  
Deep Mining ◽  
Second Stage ◽  
Mining Depth ◽  
Mining Enterprise

The article aims at determining possible annual production considering mining and technical capabilities of the underground mine. Deepening of mining operations at Kryvyi Rih iron ore basin reduces considerably annual production of the useful mineral which results in increased mining costs. To maintain annual production, it is reasonable to build the second stage of opening the depth of which depends on production volumes. When determining the optimal depth of the first stage opening, it is necessary to apply a complex research method including the graphoanalytical one for determining the underground mine’s annual production and the industrial one for adjusting the methods considering technical conditions of the enterprise. It has been determined that annual production is influenced not only by mining and geological but also by mining and technical conditions. It has been proved that annual production of an underground mine decreases in direct proportion to the increased depth of mining. The speed of skips in the shaft is greatly impacted by the length of the main opening and its operating life. With the increase of the shaft operating life the skip speed decreases from 12 to 6 – 8 m/s. When designing the flowchart of further opening of underlying levels, it is necessary to consider both mining capabilities and technical conditions of the shaft and headgear, mining depth and the main opening operating life as well as the strategy of the mining enterprise. Consideration of the above mentioned factors enables maintaining the required annual production when mining iron ores at great depths. Under conditions of Kryvyi Rih iron ore basin, it has been determined reasonable to apply the main vertical shaft flowchart when mining reserves to the depth of 1650 m.

Computer-Simulation Analysis of Foraging by Heteromyid Rodents in Relation to Seed Distributions - Implications for Coexistence

1994 ◽  
Vol 42 (4) ◽  
pp. 467 ◽  
Author(s):  
OJ Reichman ◽  
E Roberts
Keyword(s):  
Computer Simulation ◽  
Simulation Model ◽  
Simulation Analysis ◽  
Computer Simulation Model ◽  
Foraging Patterns ◽  
Uniform Distributions ◽  
Naturally Occurring ◽  
Sufficient Energy ◽  
Heteromyid Rodents ◽  
Seed Distribution

A number of hypotheses have been proposed to explain the mechanisms that promote coexistence among sympatric rodents in North American deserts. In an effort to determine how the distribution of seeds influences foraging patterns and coexistence in a three-species community of heteromyid rodents, we developed a computer simulation model that determines the efficiency of foraging for animals of different sizes. Specifically, the simulation determines how long it would take a forager to gather sufficient energy for 24 h if the animal stopped at seed patches of certain densities. The analyses were conducted for naturally occurring seed distributions and densities, for simulated normal and uniform distributions at natural densities, and for natural distributions at seed densities one-third those known to occur naturally. The results indicate that, under natural distributions and densities, each of the three species possessed unique optima for utilising seed patches of different density. However, when either the seed distribution or density differed from actual values, all three species had identical optima. The implications of these results for promoting coexistence are discussed.

scholarly journals Substantiation of ways to reclaim the space of the previously mined-out quarries for the recreational purposes

2019 ◽  
Vol 123 ◽  
pp. 01004 ◽  
Author(s):  
Tursyn Kalybekov ◽  
Manarbek Sandibekov ◽  
Kanay Rysbekov ◽  
Yryszhan Zhakypbek
Keyword(s):  
Water Management ◽  
Water Reservoir ◽  
Opencast Mining ◽  
Water Reservoirs ◽  
Mining Operations ◽  
Land Disturbance ◽  
Mining Enterprise ◽  
Methodological Approaches ◽  
Artificial Water ◽  
Artificial Origin

Opencast fields mining leads to land disturbance when conducting mining operations and storing of overburden rocks. The timely reclaiming of the disturbed lands according to the legislation requirements is an immediate duty of the subsoil user. The reclamation of the previously mined-out space of quarries refers to an extremely important tasks of the mining enterprise. The use of water management direction in reclamation assumes the use of previously mined-out space of a quarry to create the water reservoir through various methods of rehabilitation. There are presented various ways of designing the coastal zone of the created artificial water reservoirs in the previously mined-out space of the quarries located worldwide, which are used for the recreational purposes. The various profiles of slopes of artificial water reservoirs in a quarry with more low gradients, suitable for swimming and recreation are shown. Designing of a coastal area on the site of a quarry, intended for water reservoirs, depends on the water level position in the created body of water. The water reservoir, as the lake of artificial origin, created on the former quarry site, is shown. The purpose of the article is to substantiate the methodological approaches and engineering solutions concerning reclamation of the mined-out space after the opencast mining for the recreational purposes.

ON THE DEVELOPMENT OF A GENERAL METHOD FOR FORECASTING THE DANGEROUS PROPERTIES OF COAL SEAMS

2021 ◽  
pp. 135-148
Author(s):  
Yevhen Rudniev ◽  
◽  
Vyacheslav Galchenko ◽  
Elvira Filatieva ◽  
Mykola Antoshchenko ◽  
...  
Keyword(s):  
Vitrinite Reflectance ◽  
Calculated Data ◽  
Mining Machine ◽  
Dust Formation ◽  
Mining Equipment ◽  
Design Features ◽  
Mining Operations ◽  
Petrographic Composition ◽  
General Methodology ◽  
Fossil Coals

Purpose: to establish a quantitative effect on the dust-generating ability of mine layers of the degree of metamorphic transformations of fossil coals, mining-geological and mining conditions of mining operations and to provide proposals for the development of a general methodology for predicting other hazardous properties of mine layers. Methodology: research is based on the experience of using regulatory documents and analysis of the results of experimental and calculated data on dust formation of fine fractions for various observation conditions. Results: based on the analysis of statistical models of shallow and steeply dipping mine layers by groups of their dustiness, the effect of specific dust release, dust content in broken coal, moisture and thickness of the seams was established. Of all the possible factors that determine the specific dust release, the main ones are the design features of mining machines. The yield of small grades when tested by the falling weight method can serve as an indicator of the strength of coal. The use of such methods eliminates the errors caused by determining the degree of coal change during the transition from its actual destruction by a coal mining machine to the reference mode. The use of carbon content as one of the main indicators of the degree of metamorphism makes it possible to analyze the level of influence of both the sum of the remaining main components of the organic mass (hydrogen, nitrogen, sulfur, oxygen) and their separate influence. In order to bring the state of coal as close as possible to production conditions, it is necessary to additionally take into account moisture, mineral inclusions and their composition. The petrographic composition and some physical and mechanical properties are reliably characterized by the vitrinite reflectance index. The extreme limits of influence on dust formation of the design features of mass-produced combines differ by 43.4 times. The influence of metamorphic transformations at the extreme limits of the yield of the 1-0 mm class when testing coals in a pile driver is estimated by a difference of 5.6 times. The release of volatile substances taken as the main indicator of the degree of metamorphism in the normative base for the safe conduct of mining operations does not unambiguously characterize the gradation of mine layers according to their dustiness groups. The thickness of the mines being developed and the angles of occurrence do not determine their tendency to dust formation, but are the main criteria for choosing mining equipment for crushing coal in the massif. The general methodology for predicting the hazardous properties of coal mine layers, using the example of their dust-forming ability, should take into account the influence of factors of three blocks – metamorphic transformations, mining and geological and mining technical conditions. Scientific novelty: for the first time, a quantitative assessment of the effect on the dust-generating capacity of mine layers of a combination of factors of metamorphic transformation of fossil coals, mining-geological and mining-technical conditions of mining operations has been established. Practical value: the results obtained make it possible to substantiate and develop a general methodology for predicting the hazardous properties of mine layers, which will contribute to improving the regulatory framework for the safe conduct of mining operations.

Simulation model for planning mining operations

2019 ◽  
Vol 10 ◽  
pp. 214-222
Author(s):  
S.A. Varlamova ◽  
◽  
Yu.I. Volodina ◽  
A.V. Zatonskiy ◽  
P.A. Yazev ◽  
...  
Keyword(s):  
Simulation Model ◽  
Mining Operations

Study on Close Coal Seam Pressure Behavior Law of Zhong Xing Mine by Physical Model

2012 ◽  
Vol 204-208 ◽  
pp. 1439-1444
Author(s):  
Guang Shun Cai ◽  
Li Qian An ◽  
Xin Xin Zhu ◽  
Ji Li An ◽  
Ling Tao Mao
Keyword(s):  
Stress Distribution ◽  
Coal Seam ◽  
Simulation Model ◽  
Lower Layer ◽  
Shanxi Province ◽  
Overburden Rock ◽  
Geological Data ◽  
Coal Layer ◽  
Working Face ◽  
Similar Simulation

Based on the actual geological data of the 1202 lower layer work face of the Zhong Xing mine, in Shanxi province, a physical similar simulation model has been built to analyze the influence on the lower coal layer after mining the upper layer, and research on the deformation, failure law and the stress distribution of overburden rock. The results show that after mining the upper coal layer, overburden rock experienced subsidence, separation, bending and even breaking down, and the original state of the rock destroyed. The rock's intensity is weaken, and the whole rock has been softened. When the distance of the coal layers becomes smaller, the influence of the mutual exploitation becomes larger. Those results provide a reference for reasonable layout of the mining of the coal seam working face.

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