ANALYSIS OF PRODUCTION RISK FROM CRUSHES OF ROCKS AT EXCAVATION SITES, TAKING INTO ACCOUNT WAYS OF PROTECTION

2021 ◽  
pp. 124-134
Author(s):  
Iaroslav Liashok ◽  
◽  
Serhii Podkopaiev ◽  
Yuliia Simonova ◽  
Hennadii Boichenko ◽  
...  
Keyword(s):  
Practical Significance ◽  
Production Risk ◽  
Venn Diagrams ◽  
Deep Coal Mine ◽  
Geological Conditions ◽  
Rock Collapse ◽  
Available Information ◽  
Decision Making Model ◽  
Excavation Site ◽  
Industrial Risk

Purpose. To assess the production risk of rock collapse in a deep coal mine to identify hazards in the workplaces of the excavation site, taking into account different methods of protection of workings. Methods. A comprehensive approach was used, which included: analysis and generalization of known research; expert evaluation; use of the basic provisions of probability theory and set algebra (Venn diagrams), the method of estimating the production risk of Fine-Kinney; processing, analysis and interpretation of the obtained results. Results. Problems and sources of industrial risk from rock collapses during maintenance of workings, risk-forming factors that contribute to the threat of dangerous events at the excavation site are analyzed. The decision-making model is considered, which is based on the description of situations when the production risk of the dangerous factor “landslides and collapses” in the maintenance of preparatory workings depends on the result of choosing an alternative method of protection of the retractable lane. For excavation sites under the same mining and geological conditions for all workplaces, the probability of receiving consequences from dangerous events due to uncertain conditions of their implementation has been established. It is fixed that the realization of this production risk is influenced by low reliability and inefficiency of the practiced methods of protection of excavations. Risk analysis is defined as the systematic use of available information to identify hazards in the maintenance of long workings. Novelty. A model for monitoring the production risk of rock collapses in excavations of deep coal mines is proposed, which allows assessing the dynamics of the threat at the stage of technical decisions related to the choice and justification of the method of protection of workings taking into account the interaction of risk factors. Practical significance. When formulating measures to reduce the risk of dangerous events at the excavation site, it is necessary to take into account that the production risk of rock collapse while maintaining the workings depends largely on the method of protection and effectiveness of technological measures.

scholarly journals Effect of Advancing Direction of Working Face on Mining Stress Distribution in Deep Coal Mine

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Yuesong Tang ◽  
Wenchao Sun ◽  
Xin Zhang ◽  
Pengju Liu
Keyword(s):  
Stress Distribution ◽  
Large Scale ◽  
In Situ Stress ◽  
Deep Mining ◽  
Deep Coal Mine ◽  
Working Face ◽  
Geological Conditions ◽  
Original Rock ◽  
High Level

Deep mining has become the normal state of coal mining; compared with the mine with shallow buried depth, the consequent high level of in situ stress and complex distribution have brought severe threats to the stability of the stope and the surrounding rock of the roadway. In this research, taking the 121304 working face of Kouzidong Mine as the engineering background, the characteristics of mining-induced stress distribution under complex in situ stress environment in deep mining are analyzed by using on-site measurement of the original rock stress and mining stress, establishing a theoretical model centered on the middle section of the working face, and establishing large-scale numerical calculation models for different advancing directions. It was found that under deep mining conditions, the maximum stress of the original rock is 25.12 MPa, and the direction is vertical. The advanced influence range of mining stress is about 150 m, and the abutment pressure presents a three-peak distribution characteristic in front of the working face. The research results provide important theoretical guiding value for guiding the mining of coal mines with similar geological conditions.

scholarly journals Application of seismic multiattribute machine learning to determine coal strata thickness

2021 ◽  
Vol 18 (6) ◽  
pp. 834-844
Author(s):  
Yanhui Wu ◽  
Wei Wang ◽  
Guowei Zhu ◽  
Peng Wang
Keyword(s):  
Machine Learning ◽  
Coal Mining ◽  
Accurate Determination ◽  
Mining Industry ◽  
Seismic Exploration ◽  
Practical Significance ◽  
Application Performance ◽  
Working Face ◽  
Geological Conditions ◽  
Single Attribute

Abstract The coal mining industry is developing automated and intelligent coal mining processes. Accurate determination of the geological conditions of working faces is an important prerequisite for automated mining. The use of machine learning to extract comprehensive attributes from seismic data and the application of that data to determine the coal strata thickness has become an important area of research in recent years. Conventional coal strata thickness interpretation methods do not meet the application requirements of mines. Determining the coal strata thickness with machine learning solves this problem to a large extent, especially for issues of exploration accuracy. In this study, we use seismic exploration data from the Xingdong coal mine, with the 1225 working face as the research object, and we apply seismic multiattribute machine learning to determine the coal strata thickness. First, through optimal selection, we perform seismic multiattribute extraction and optimal multiparameter selection by selecting the seismic attributes with good responses to the coal strata thickness and extracting training samples. Second, we optimise the model through a trial-and-error method and use machine learning for training. Finally, we illustrate the advantages of this method using actual data. We compare the results of the proposed model with results based on a single attribute, The results show that application of seismic multiattribute machine learning to determine coal strata thickness meets the requirements of geological inspection and has a good application performance and practical significance in complex areas.

scholarly journals Microeconomic Effects Of Reduced Yield Variability Cultivars Of Soybeans And Wheat

1992 ◽  
Vol 24 (1) ◽  
pp. 121-133 ◽  
Author(s):  
Carl R. Dillon
Keyword(s):  
Production Management ◽  
Effective Means ◽  
Yield Variability ◽  
Management Decision ◽  
Wheat Cultivars ◽  
Production Risk ◽  
Management Decision Making ◽  
Programming Techniques ◽  
Decision Making Model ◽  
New Crop

AbstractEconomic analysis was conducted on hypothetical agronomic research on new crop cultivars for Arkansas dryland soybean and wheat producers. In relation to farmers' attitudes toward risk, the microeconomic effects and level of adoption of yield variability reducing cultivars were analyzed utilizing a production management decision-making model formulated with mathematical programming techniques. The study indicated that negative covariance between crops continues to be an effective means of reducing production risk associated with yield variability. However, under varying circumstances, agronomic research on the breeding of new soybean and wheat cultivars with reduced yield variability is worthwhile if there is only slight concurrent reduction in expected yields.

Assessment of the public administration of e-commerce development in the Republic of Kazakhstan

2021 ◽  
Author(s):  
Г.Р. Даулиева ◽  
А.Е. Ералиева ◽  
G. Dauliyeva ◽  
A. Yeraliyeva
Keyword(s):  
Structural Changes ◽  
Legal Regulation ◽  
The State ◽  
Digital Data ◽  
Practical Significance ◽  
The Public ◽  
State Management ◽  
State Administration ◽  
The Republic ◽  
Available Information

Пандемия подстегнула развитие рынка розничной электронной коммерции в Казахстане. По данным исследования PwC Kazakhstan, за год этот сегмент вырос на 93%. Целью исследования является оценка государственного управления развития электронной коммерции в Республике Казахстан. Развитие электронной коммерции вызывает неизбежные структурные изменения в экономике. Сложность регулирования цифровой среды заключается, главным образом, в ее нестатичности, постоянном развитии и изменении. Впервые объектом регулирования становятся правоотношения, связанные с реализацией прав в цифровом пространстве, использованием цифровых данных и технологий. По мнению многих юристов, изучающих эту сферу, должны, соответственно, обновляться и методы правового регулирования. Научная значимость исследования обоснована анализом развития рынка электронной коммерции в РК. Практическая значимость исследования обоснована возможностью использования материалов исследования оценке государственного управления электронной коммерцией в РК. Исследование осуществлялось в рамках доступной информации международных, государственных и общественных организаций, а также научно-практических публикаций в ведущих изданиях периодической печати и интернете. Исследование проводилось с использованием аналитических, сравнительных и оценочных методов, на основе статистических данных, по которым были сделаны следующиевыводы и предложены рекомендации: развитие логистических центров и сортировочных центров; назначение налоговых преференций и введение моратория на налоги для интернет-компаний; интеграция процессов БВУ в межбанковскую систему платежных карт; снижение комиссий по имуществу, подлежащему использованию физическими лицами. The aim of the study is to assess the state administration of e-commerce development in the Republic of Kazakhstan. The development of e-commerce is causing inevitable structural changes in the economy. The complexity of regulating the digital environment lies mainly in its instability, constant development and change. For the first time, legal relations related to the exercise of rights in the digital space, the use of digital data and technologies are becoming the subject of regulation. In the opinion of many lawyers studying this area, the methods of legal regulation should be updated accordingly. The scientific significance of the study is substantiated by an analysis of the development of the e-commerce market in the Republic of Kazakhstan. The practical significance of the research is substantiated by the possibility of using research materials to assess the state management of e-commerce in the Republic of Kazakhstan. The study was carried out within the framework of available information from international, state and public organizations, as well as scientific and practical publications in leading periodicals and the Internet. The research was carried out using analytical, comparative and evaluative methods, based on statistical data, on which appropriate conclusions were made and recommendations were made.

Management decision-making algorithm development for planning activities that reduce the production risk level

2019 ◽  
Vol 1-2 (93) ◽  
pp. 41-49
Author(s):  
O. Kruzhilko ◽  
V. Maystrenko
Keyword(s):  
Mathematical Model ◽  
Preventive Measures ◽  
Management Decision ◽  
Expert Assessment ◽  
Management Decisions ◽  
Production Risk ◽  
Model Of Management ◽  
Management Decision Making ◽  
Expert Assessments ◽  
Industrial Risk

Purpose: Algorithm development for a measures phased expert assessment to reduce production risk at an industrial enterprise to adapt the expert method to the conditions for specific problem solving. Design/methodology/approach: To develop an algorithm for making management decisions, a step-by-step solution process was used. If the problem is solved under conditions of complete or partial uncertainty, an expert method of estimation was applied. In the mathematical model of management decision-making used criterion approach. At the same time, the methods of Sevij, Wald, and Hurwitz are considered to determine the criterion for choosing management decisions. Findings: A phased expert assessment of measures that reduce production risk at an industrial enterprise with the introduction of weighting factors in specified criteria is proposed. The expediency of applying the method of expert assessments and the Hurwitz criterion when planning measures to reduce industrial injuries is justified, since this approach links the preventive measures in the field of labour protection with the results of risk assessment and reduces subjectivity in making management decisions. Research limitations/implications: The proposed algorithm for expert assessment of measures to reduce production risk is universal for industrial enterprises. Practical implications: An algorithm has been developed to substantiate managerial decisions to reduce the production risks of the occurrence of traumatic events when planning preventive measures, which involves applying criteria for selecting measures based on the method of expert assessments and applying the Gurwitz criterion. Originality/value: Developed a consistent model of industrial risk management, which is based on a component method of assessing the risk of traumatic events and a mathematical model of management decisions. This model differs from the existing ones, taking into account all available risk-relevant information of the enterprise, stimulates preventive activity, and allows establishing the dependence of the level of industrial risk on the validity of measures on occupational safety and reducing the influence of the subjective component of expert judgments.

ANALYSIS OF PRODUCTION RISK ON EXAMPLES OF MINERS ‘LABOR

2021 ◽  
pp. 159-175
Author(s):  
Mikhail Kostyuchenko ◽  
◽  
Volodymyr Gogo ◽  
Boris Kobilyansky ◽  
Oleg Kruzhilko ◽  
...  
Keyword(s):  
Mathematical Models ◽  
Situational Analysis ◽  
Coal Miners ◽  
Systematic Analysis ◽  
Production Risk ◽  
Emergency Situations ◽  
Management Processes ◽  
Industrial Risks ◽  
Industrial Risk

Objective: Based on the review of the array of publications to analyze the methods and models of general risk assessment, the nature of industrial risks and management processes on the examples of labor of coal miners. Propose a classification of mathematical models of industrial risk and identify the most appropriate model for the work of miners in the stochastic system “man-machine-environment”. Methodology: Applied to the use of situational analysis, qualimetry, probability theory and risk theory, methods of classification of occupational risks. Results: Based on a systematic analysis of multifactorial risks of emergency situations, the essence of industrial risks and management processes on the examples of coal miners, the dominant causes of industrial risk in the ergatic system (“man – machine – environment”), models and methods of risk research. Scientific novelty: For the first time on the basis of the analysis of the reasons, dynamics and consequences of industrial risks the classification of mathematical models of risks which are adapted to ergatic systems of mine production is offered. Practical value: The need for adequate practical application of risk methods and models for the assessment and measurement of industrial hazards has been proven.

Seepage Filed Studies on the Effect of the Proposed Underground Garage

2013 ◽  
Vol 353-356 ◽  
pp. 34-39
Author(s):  
Qi Xia Liu ◽  
Xin Zou ◽  
Kai Qi Wang ◽  
Yang Zhao ◽  
Qing Zhao
Keyword(s):  
Detailed Analysis ◽  
Conceptual Model ◽  
Working Conditions ◽  
Surface Waters ◽  
Scientific Basis ◽  
Practical Significance ◽  
Seepage Field ◽  
Geological Conditions ◽  
Practical Engineering

This paper intends to solve the leakage of the surface waters on the proposed underground garage impact from a practical engineering, so we carry on the detailed analysis about the surrounding hydro geological conditions to provide scientific basis for underground garage waterproof design. On that basis, we establish the hydro geological conceptual model, using Visual MODFLOW4.1 software to simulate the seepage field in two kinds of working conditions, and get the result of the surface waters on the proposed garage impact. Thus in the underground garage of the soleplate waterproof design we adopt different block waterproof practices which may save a lot of fund, and have the important theoretical and practical significance to us.

scholarly journals ACTUAL DESIGN MODEL DEVELOPMENT OF PROTECTIVE SCREEN OVER THE ACTIONS OF SUBWAY LINES

2017 ◽  
Vol 2 (49) ◽  
pp. 99-107
Author(s):  
V. G. Pastushkov ◽  
A. A. Dalidovskaya
Keyword(s):  
Model Development ◽  
Calculation Model ◽  
Design Model ◽  
Practical Significance ◽  
System Construction ◽  
Protective Shield ◽  
Geological Conditions ◽  
Actual Design ◽  
Complex Engineering ◽  
Protective Screen

It is given calculation model development results of protective shield overexisting tunnels of subway in influence zone of transport interchange construction  in the city of Minsk. The analysis of modeling problems of the system «construction - soil massif» is performed. It is proposed the approach to development of an adequate design model for complex engineering-geological conditions. An adequate calculation model of the transport interchange site was developed. The applying modern methods results of calculating the system «construction – soil massif» are given. The stress-strain state nature of the tunnel structures at all stages of the transport interchange construction is analyzed. The results of the calculation are compared with the data obtained during testing of the protective screen in full-scale conditions. The special practical significance of using such calculation methods at the design and construction stage of transport facilities is noted.

scholarly journals On the relationship between gas emission from undermined coal-bearing stratum and the intensity of coal seam mining

2021 ◽  
Vol 280 ◽  
pp. 08017
Author(s):  
Sergei Mineev ◽  
Elvira Filatieva ◽  
Aleksandr Oleinichenko ◽  
Mihaela Toderas
Keyword(s):  
Unit Area ◽  
Active Movement ◽  
Gas Release ◽  
Coal Seams ◽  
Theoretical Scheme ◽  
Geological Conditions ◽  
Characteristic Points ◽  
Seam Mining ◽  
The Relationship ◽  
Excavation Site

A theoretical scheme of gas release from the coalbed under production by treatment workings has been developed. The sizes of zones of different intensity of gas release from the working thickness are set according to the characteristic points of muld shift of the earth's surface. Total amount of releasing gas is determined by the area of the developed space, over which there is an intensive movement of the mined coal. The formation of this area is associated with the development of cleaning operations within the boundaries of the excavation site and the speed of movement of the treatment face. During the development of the theoretical scheme, several assumptions were made, the validity of which was verified on the basis of experimental data obtained in the conditions of four mines at fifteen excavation sites. Coal seams with coals of grades G and A were worked out by them at a depth of 300-1195 m, the capacity of coal seams was 0.90-2.20 m, cleaning works were carried out at a depth of 300-1195 m, the length of the lavas was in the range of 74÷270 m. The monthly movement of the treatment faces and the amount of gas released during this period were taken into account for each excavation site. It is established that the relative gas release per unit area of the developed space remains a fairly constant value for some mining and geological conditions, if the total amount of gas is attributed to the area that determines the active movement of rocks over a moving treatment face. This allows you to use the previously obtained results of determining the categorical danger of mines by relative gas release per ton of coal production in terms of improving the forecast of gas release from the coalbed under production more efficiently.

MINE FIELD TYPING BY GENERAL CHARACTERISTICS FOR MINE CONDITIONS OF «DTEK PAVLOGRADUGОL»

2020 ◽  
pp. 33-39
Author(s):  
Sergey Vlasov ◽  
◽  
Svetlana Timchenko ◽  
Yavhen Moldavanov ◽  
◽  
...  
Keyword(s):  
Cluster Analysis ◽  
Coal Mining ◽  
Main Roof ◽  
Spatial Modelling ◽  
Practical Significance ◽  
Technical Documentation ◽  
Homogeneous Groups ◽  
Geological Conditions ◽  
The Face ◽  
The Impact

Purpose. The purpose of the research is to optimize the parameters of calculations in the spatial modelling of geomechanical processes during the advancement of the face. Method. The statistical method of research of mining and technical and geological data is used in the work, which is aimed at collecting primary statistical material, processing, systematization and grouping by common features, from characteristics of individual elements to generalizing indicators in the form of absolute, relative or average values of ordering, data processing and interpretation. Results. The cluster analysis of conditions on mine fields is presented. Of the fifteen mining and geological parameters that affect the step of planting the main roof, two homogeneous groups of minefields were identified to simplify the calculations, and further, to find objective patterns. A dendrogram of minefield typification is constructed. Scientific novelty. On the basis of the collected materials of the technical documentation on the coal mining enterprises of DTEK Pavlogradugol, by applying cluster analysis, for the first time the minefields were typified with the help of mining and geological conditions affecting the efficiency of coal mining models. Practical significance. Cluster analysis will significantly reduce the amount of calculations in the modelling of geomechanical processes. To increase the reliability of calculations by probabilistic and statistical representations of the nature and mechanism of planting the main roof. The typification of conditions, in the future, will allow modelling of stepwise movement of the face in the spatial geomechanical model of the excavation site, to predict the impact of mining and geological conditions on the technology of treatment, which will increase the efficiency of coal mining in Western Donbas.

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