scholarly journals Peculiarities of using classification indicators of the coal metamorphism degree for predicting the hazardous coal seams properties

2020 ◽  
Vol 201 ◽  
pp. 01014
Author(s):  
Mykola Antoshchenko ◽  
Elvira Filatieva ◽  
Vladyslav Yefimtsev ◽  
Vadym Tarasov
Keyword(s):  
Spontaneous Combustion ◽  
Chemical Activity ◽  
Mining Engineering ◽  
Coal Seams ◽  
Mining Operations ◽  
Emergency Situations ◽  
Specific Composition ◽  
Geological Conditions ◽  
Definition Of ◽  
Mining Coal

Currently, there is no reliable regulatory framework for determining the hazardous properties of coal seams, including the propensity of coal for spontaneous combustion. Under relatively identical mining engineering and geological conditions for mining coal seams, the probability of emergency situations is determined to a large extent by the genetic properties of coal. The research methodology is based on the classical definition of metamorphism, which characterizes the change in the composition and properties of coal. The analysis involves indicators that directly or indirectly characterize the elemental composition of organic and mineral mass, chemical activity and physico-mechanical properties. This will allow to establish a specific composition and properties that contribute to the manifestation of certain hazardous properties of coal seams during mining operations. It is shown that the modern industrial classification does not take into account the change in the organic and mineral constituents of coal, which does not make it possible to use it unchanged to predict the hazardous properties of coal seams.

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 Determination of the Parameters of Technological Schemes for the Development of Coal Seams Prone to Spontaneous Combustion using Computer Simulation

2019 ◽  
Vol 105 ◽  
pp. 01016
Author(s):  
Sergey Meshkov
Keyword(s):  
Computer Simulation ◽  
Spontaneous Combustion ◽  
Longwall Mining ◽  
Underground Mining ◽  
Fire Hazard ◽  
Modern Technology ◽  
Coal Seams ◽  
Mining Operations ◽  
Gas Dynamic ◽  
Mining Coal

The study considers thr problem of endogenous fire hazard in underground mining of coal seams prone to spontaneous combustion. The main trends in the development of modern technology of underground coal mining are shown. The interaction of air-gas-dynamic and geomechanical processes in the development of coal seams by longwall mining is considered. The possibilities of computer simulation of air-gas-dynamic processes in the extraction districts of modern coal mines are considered. The significant influence of geological and mining conditions of mining operations on the distribution of air flow in extraction districts and the efficiency of gas emission control in the workings of the extraction districts are shown. The design scheme and the results of numerical studies (methane and oxygen concentration fields) are given. It is concluded that it is necessary to determine the rational parameters of the preparation, ventilation, isolated drainage and degassing schemes when developing gas-bearing coal seams that are prone to spontaneous combustion. Recommendations are given on improvement of the safety in mining coal seams that are prone to spontaneous combustion.

scholarly journals Analysis of Possible Origination of Domes in Longwalls

2019 ◽  
Vol 4 (1) ◽  
pp. 57-64
Author(s):  
R. I. Imranov ◽  
E. N. Khmyrova ◽  
O. G. Besimbayeva ◽  
S. P. Olenyuk ◽  
A. Z. Kapasova
Keyword(s):  
Rock Mass ◽  
Factor Of Safety ◽  
Coal Seams ◽  
Mining Operations ◽  
Compressive Stresses ◽  
Digital Modeling ◽  
Geological Conditions ◽  
The Stability ◽  
High Ash Coal ◽  
Borehole Log

The research is aimed at solving problems of assessing underground working stability in complicated mining and geological conditions to increase reliability and safety of mining operations. Analysis of geomechanical processes occurring in a rock mass during extraction of coal seams to determine the stability of mining block roof is the most important task. The performed digital modeling of the rock mass based on the structural logs for K1 seam and the nearest borehole log enabled highly detailed identifying the types of rocks occurred in the seam roof and their strength characteristics, compressive stresses. To determine the stability of a mining block roof, the factor of safety of the rocks was used, which was determined by modeling method using Phase 28.0 and Rockscince software. The carbonaceous argillite parting 0.09–0.12 m thick was taken as the contact of the longwall with the seam roof, and, for completeness of the analysis, the upper high-ash coal member in the seam roof up to 0.7 m thick was used. The modeling findings, presented in the graph of dependence between the safety factor and the distance between the belt heading and air drift, showed that the probability of dome formation in the longwall is high, as the factor of safety of the rocks is less than unity, that indicates the roof instability in the course of the coal seam block extraction. The modeling methods allowed assessing the mine working stability, based on which the measures to improve the reliability and safety of mining operations can be timely developed, and due technical and technological solutions shall be reached.

scholarly journals Prospects for the use of modern technological solutions in the flat-lying coal seams development, taking into account the danger of the formation of the places of its spontaneous combustion

2021 ◽  
Vol 250 ◽  
pp. 534-541
Author(s):  
Vladimir Zubov ◽  
Dmitrii Golubev
Keyword(s):  
Spontaneous Combustion ◽  
Underground Mining ◽  
Fire Hazard ◽  
Coal Dust ◽  
Economic Losses ◽  
Coal Seams ◽  
Emergency Situations ◽  
Wide Range ◽  
Spontaneous Combustion Of Coal ◽  
The Impact

Spontaneous combustion of coal remains an important problem for coal mines, which can lead to an explosion of methane and coal dust. Accidents associated with spontaneous combustion of coal can cause significant economic losses to coal mining companies, as well as entail social damage – injuries and loss of life. Accidents are known at the Kuzbass mines, which occurred as a result of negligent attitude to the danger of spontaneous combustion of coal, the victims of which were dozens of people. The analysis of emergency situations associated with spontaneous combustion of coal shows that the existing wide range of means of preventing endogenous fires does not provide complete safety when working out coal seams prone to spontaneous combustion, therefore, spontaneous combustion places continue to occur in mines. The consequences that may arise as a result of a methane explosion initiated by a self-ignition place indicate the need to improve the used technologies. The purpose of the work is to determine the impact of modern technological solutions used in functioning mines during underground mining of flat-lying coal seams prone to spontaneous combustion, and to develop new solutions that reduce endogenous fire hazard. Conclusions on the influence of leaving coal pillars in the developed space, isolated air removal from the stoping face through the developed space, the length of the stoping face and the excavation pillar, and other factors on the danger of the formation of spontaneous combustion places are presented. Conclusions about the possibility of using modern technological solutions in future are also drawn.

scholarly journals The evolution of thick coal seams mining methods in China

2020 ◽  
Vol 192 ◽  
pp. 01023
Author(s):  
Qiao Jianyong ◽  
Wang Zhiqiang ◽  
Zhao Jingli
Keyword(s):  
Coal Mining ◽  
Spontaneous Combustion ◽  
Underground Coal Mining ◽  
Coal Seams ◽  
Recovery Coefficient ◽  
Increased Risk ◽  
Geological Conditions ◽  
Mechanized Method ◽  
Full Capacity ◽  
The Moment

The article is shown that the main methods used in China for coal mining from thick seams at the moment are two methods the Complex mechanized method of developing seams at their full capacity (used only in simple geological conditions and is an additional method for the following) and Complex mechanized mining method with coal production (which is used mainly, including in difficult conditions). Despite the fact that these methods have positively proven themselves over the years, their use has a number of significant drawbacks, including a low extraction rate, an increased risk of endogenous combustion and rock burst, and others. Currently, a promising way is a development method with a diagonal (cross-shaped) arrangement of drifts, which helps to eliminate many of the shortcomings of previous methods, including a low recovery coefficient, the risk of spontaneous combustion, the need to support the drift and others. It is expected that this method will be widely used for underground coal mining in deep mines in China with difficult mining and geological conditions.

scholarly journals Passive Experiments for Monitoring Mining Operations by Dragline at Kuzbass Open Pits – Estimation of Coal Losses

2020 ◽  
Vol 174 ◽  
pp. 01030
Author(s):  
Alexei Selyukov ◽  
Kirill Byrdin
Keyword(s):  
Kuznetsk Basin ◽  
Open Pit ◽  
Open Pit Mining ◽  
Coal Seams ◽  
Mining Operations ◽  
Sedimentary Deposits ◽  
Coal Deposits ◽  
Geological Conditions ◽  
Tectonic Disturbances ◽  
Dip Angle

The natural conditions for the formation of coal deposits in different regions of the globe are the same, all of them belong to reservoir sedimentary deposits and differ only in the degree of metamorphism and tectonic disturbances. In this regard, coal deposits of the Kuznetsk basin (Kuzbass, Western Siberia, Russia)) that have no analogues in nature are unique. Here are all sorts of options for the occurrence of coal seams both in terms of their thickness, dip angle, number, and the degree of disturbance by plicative and disjunctive disturbances. The article presents some results of research on ways to reduce coal losses in open pit mining during its extraction by draglines. The study was carried out on the example of deposits in Kemerovo region with coal seams in an inclined and steep formations, which allows analyzing the possibilities of applying the proposed technological solutions in the widest range of specific mining and geological conditions.

scholarly journals Numerical simulation study of mining process of upper and lower walls of normal and reverse faults

2021 ◽  
Vol 2083 (3) ◽  
pp. 032071
Author(s):  
Bian Zhuang
Keyword(s):  
Coal Seam ◽  
Numerical Models ◽  
Hanging Wall ◽  
Coal Pillar ◽  
Normal Fault ◽  
Reverse Fault ◽  
Coal Seams ◽  
Working Face ◽  
Geological Conditions ◽  
Mining Coal

Abstract Mining coal seams near faults are prone to various mine disasters, and different mining sequences have different effects on coal seam disasters. Under this background, the numerical models of normal fault hanging wall, normal faultfoot wall, reverse fault hanging wall and reverse fault footwall under the same geological conditions are established. It is found that the stress concentration of coal pillar is the largest in the mining process of hanging wall of normal fault and footwall of reverse fault, and the possibility of inducing coal pillar rockburst is the largest. Affected by the fault, the coal pillar abutment stress between the working face and the fault shows an upward trend. When mining the coal seam near the fault, various methods such as hydraulic fracturing should be adopted to reduce the coal pillar abutment stress and reduce the risk of mine disasters.

scholarly journals Application of geophysical research of wells in determining the qualitative characteristics of coals and physico-mechanical properties of containing rocks

2020 ◽  
pp. 32-35
Author(s):  
I. V. Vasileva
Keyword(s):  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
Ash Content ◽  
Operating Conditions ◽  
Geophysical Data ◽  
Coal Seams ◽  
Coal Quality ◽  
Geological Conditions ◽  
Definition Of

Geophysical exploration wells during the exploration of coal deposits solve many geological problems. Among them: the lithological section subdivision, allocation of coal seams, the definition of the depth of their occurrence and the angles of incidence breeds, the definition of power, structure, ash, coal quality characteristics, determination of synonymy coal seams, and others. Data of GSW used in the calculation of coal reserves in the field. Precision geophysical definition of physical and mechanical properties of rocks is estimated by comparing the results obtained with the data of GSW, and rock samples in the laboratory.Geophysical surveys of boreholes are used to solve the following geological problems: lithological dissection of the section; allocation of coal seams and determination of their depth; determining the thickness, structure and ash content of coal seams, as well as determining the characteristics of coal quality; highlighting tectonic faults in borehole sections, determining their type and amplitude; determination of hydrological operating conditions, study of the temperature and gas regime of rocks, technical condition of boreholes.In addition, GIS data is used to calculate the explored coal reserves.Interpretation of geophysical data is the clarification and explanation of the information received regarding the geology of the site and the physical and mechanical properties of the object. Interpreting geophysical data is challenging. Its solution is of great practical importance for the prospecting and exploration of mineral deposits. The article provides an overview of some of the existing methods of determining the ash content of coal on the results of GSW and forecast geological conditions of coal mining.

scholarly journals Experimental mining of three coal seams by transportless technology

2021 ◽  
Vol 303 ◽  
pp. 01013
Author(s):  
Andrew Strelnikov ◽  
Zuzana Šimkova ◽  
Seroni Anyona
Keyword(s):  
Practical Interest ◽  
Minimum Cost ◽  
Maximum Amount ◽  
Open Pit ◽  
Experimental Basis ◽  
Coal Seams ◽  
Geological Conditions ◽  
Internal Dump ◽  
Mining Coal ◽  
The Cost

In conditions of market economy and competition it is of great importance to reduce the cost of coal mining. It is especially important when mining coal at the complicated deposits of Kuzbass. In these conditions it is important to choose the technology of stripping and winning works, providing a minimum cost for them. There are two essential factors for achieving this goal: reduction of expenses on transportation of overburden and expenses connected with alienation of lands for external dumps and their reclamation. Therefore, promising technologies are those that ensure the placement of the maximum amount of overburden in the internal dump. This condition sets the task of expanding the scope and boundaries of application of transportless technology, which is used in Kuzbass both independently and in combination with transport technology. In particular, the combined technology is used at Chernigovets open pit mine, where the upper part of the quarry field, containing Kemerovsky seam, is mined using transport technology. The lower part up to 70 m high, which includes three flat seams: Volkovsky, Podvolkovsky I, Podvolkovsky II, on an experimental basis is mined by transportless technology (the volume of stripping works is 5-10 % of the total volume). A distinctive feature of the experiment is the performance of stripping and winning operations with a single dragline excavator, which eliminates the cost of maintaining the rope shovel and bulldozer. Therefore, the experience of using this technology is of practical interest for other open pits in the basin, as well as for any other quarries with similar mining and geological conditions.

Advanced Systems to Prevent Collisions of Mining Equipment and Personnel Accidents in Surface Mining

2020 ◽  
pp. 24-29
Author(s):  
A.F. Klebanov ◽  
M.V. Kadochnikov ◽  
V.V. Ulitin ◽  
D.N. Sizemov
Keyword(s):  
Human Life ◽  
Surface Mining ◽  
Production Cycle ◽  
Mining Equipment ◽  
Mining Operations ◽  
Emergency Situations ◽  
Surface Mines ◽  
Technical Requirements ◽  
Personal Devices ◽  
Blind Spots

The article addresses the issues of ensuring safe operation of mining equipment in surface mining. It describes the main factors and situations that pose a high risk to human life and health. The most dangerous incidents are shown to be related to limited visibility and blind spots for operators of mining equipment, which can result in collisions and personnel run over. The main technologies and specific solutions used to design collision avoidance systems are described and their general comparison is provided. A particular focus is placed on monitoring the health of employees at their workplace by means of portable personal devices that promptly inform the dispatcher of emergency situations. General technical requirements are formulated for designing of the system to prevent equipment collisions and personnel run over in surface mining operations. The paper emphasizes the importance of introducing a multifunctional safety system in surface mines in order to minimise the possibility of incidents and accidents throughout the entire production cycle.

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