Development of a research methodology and analysis of the stress state of a parting under the joint and downward mining of coal seams

Kovalevska, Iryna; Barabash, Mykhailo; Snihur, V.

doi:10.15407/mining12.01.076

Cited by 15 publications

(13 citation statements)

References 4 publications

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“…The results of the mine operation depend on a wide range of factors, which act strictly individually in the specific conditions of each mine and often have the opposite direction. For example, the mine may have a relatively shallow depth of development, but also a low thickness of a seam [9,10]. Natural factors exist from time eternal, they are not controlled and their effect is largely predictable.…”

Section: Presentation Of the Main Research Materials With Full Substanmentioning

confidence: 99%

Productive flows control in coal mines under the condition of diversification of production

et al. 2018

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The objective of the work consists in methodical bases of concept development for control by productive flows in coal mines with the use of cost-effective mechanisms. These mechanisms would provide their stable functioning in conditions of uncertainty and risks, formed by internal and external factors. The theoretic views have been used for the supply system structuring, when assessing the opportunities and reasonability to contract out the diversified production operations. The correlation of industrial factors has been defined, representing the mine as a multi-level system, and a logical interpretation of the obtained dependences. The system of efficiency evaluation has been proposed, which is intended to supplement the existing system of risk management with a kind of control element, an indicator of the positive processes in processing technogenic wastes of mines and dressing plants.

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Section: Presentation Of the Main Research Materials With Full Substanmentioning

confidence: 99%

Productive flows control in coal mines under the condition of diversification of production

et al. 2018

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“…During the process of implementing measures to avoid sudden outbursts of coal and gas, changes in the state of outburst-prone seam is controlled according to th initial velocity of gas emission; effect of technogenic factors is not involved [10]. Therefore, analysis of the additional loading of coal-gas system by coal destruction with the help of coal shearer, drilling and blasting operations, drilling of advance wells, hydrodynamic or hydroimpulsive procedures is another tendency.…”

Section: Analysis Of a State Of Outburst-prone Seam In Front Of A Roamentioning

confidence: 99%

Conceptual tendencies to analyze coal-gas system state under the hydroimpulsive effect

et al. 2019

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The paper considers conceptual tendencies concerning the analysis of coal-gas system state within rock mass in front of a mine working stope in the context of hydroimpulsive effect on an outburst-prone coal seam. It has been shown that mining intensification is impossible without the improved efficiency of means indented to avoid gasdynamic phenomena taking into consideration the effect of technogenic factors on operation schedules. It has been determined that since grades of outburst-prone coal are of globular structure, its breakage may involve changes in molecular weight of coal substance and generation of methane and water molecules. In the context of a shear model of undermined rock mass, method of graphical analysis has been applied to determine areas of changes in border angles of demonstration of the initial and maximum deformation under the effect of rock bearing pressure. The determined dependences are described rather reliably by means of similar logarithmic curves which characterizes identity of their nature. Changes in filtration coal characteristics in the context of shear deformations have been considered. It has been proved experimentally that if injection pressure varies, periodically discontinuous fluid flow has initial, stable, and decaying stages being implemented in the forms of cavitation phenomena and high-frequency hydroimpulsive vibration. Sequence of methods to study parameters of hydroimpulsive action, evaluation of its efficiency, and control over a change in coal-gas system state of outburst-prone coal seams have been considered.

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“…The calculation principle of the weak zone is to compare each of the active stress components σy, σx and σz with a condition of absolute unloading (criteria σx = 0, σz = 0 and σy = 0), when the process of parting rock segregation with tensile forces begins. But in areas where compressive stresses take precedence, the intensity of stresses σ is equal to the calculated ultimate compressive strength value Ri R,B of one lithotype or another [3].…”

Section: Calculation Of the Weak Zones Of Parting Rocksmentioning

confidence: 99%

“…2. The parting rock structure systematization under the condition of joint and downward mining of coal seams in Western Donbas made it possible to allocate the five most common geological structures [3]. They have been provided as the basis for (using the finite element method) the calculation of abnormal areas of rock pressure manifestation, the subsequent assessment of the parting stability and corresponding decision-making as to the development, fastening, and maintenance of both mine workings and coal-face works.…”

Section: Introductionmentioning

confidence: 99%

Assessment of parting rock weak zones under the joint and downward mining of coal seams

et al. 2018

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The aim of the forecasting effort is to identify troublesome zones of stability loss by a parting lengthwise of the extraction panel under the joint and downward mining of coal seams. Analyses have been carried out of active stress component curves for a 3-D model computational experiment compared with the strength characteristic of each lithotype of a parting. An algorithm has been developed for the stability assessment of a parting lengthwise along the extraction panel. The relationship patterns have been estimated between the sizes of the parting rocks discontinuity zones and the main geomechanical parameters. A scientifically grounded basis has been created for the detection of the parting rock weak zones lengthwise along the extraction panel for the calculation of the mounting and security systems of the development works. A complex of underground instrumental observations was made, which was used to set up a correspondence of patterns to indicate the variation in rock pressure manifestation intensity and the tendencies for changes in the parting structure. All of this confirms the adequacy of the techniques for parting state forecasting, which is recommended for use in the engineering documentation for the joint and downward mining of coal seams.

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Development of a research methodology and analysis of the stress state of a parting under the joint and downward mining of coal seams

Cited by 15 publications

References 4 publications

Productive flows control in coal mines under the condition of diversification of production

Productive flows control in coal mines under the condition of diversification of production

Conceptual tendencies to analyze coal-gas system state under the hydroimpulsive effect

Assessment of parting rock weak zones under the joint and downward mining of coal seams

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