Method for optimizing the protecting pillars parameters in underground coal mining

Bondarenko, Volodymyr; Kovalevska, Iryna; Symanovych, H.; Poimanov, Serhii; Pochepov, Viktor

doi:10.1051/e3sconf/202016602009

Cited by 4 publications

(2 citation statements)

References 13 publications

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“…The role of modern advanced coal mining technologies is increasing, which contribute to the improvement of its quality and the accumulation of coal mining waste in the underground space of mines, resource saving in the exploitation of underground mine workings, especially in difficult mininggeological conditions [10]- [15]. Therefore, the maintenance of our own coal production [16], [17] in parallel with a "soft" transition to alternative energy sources is a priority task that determines the transformation of coal-mining cities and the sustainable development of our country.…”

Section: Introductionmentioning

confidence: 99%

A new concept for complex mining of mineral raw material resources from DTEK coal mines based on sustainable development and ESG strategy

Bondarenko¹,

Salieiev²,

Kovalevska³

et al. 2023

Min. miner. depos.

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Purpose. The research purpose is to develop a concept for complex mining of mineral resources from coal mines using the example of PJSC DTEK Pavlohradvuhillia mines with a transition to multi-product production of clean drinking water, utilization of methane, secondary coal from rock dumps and sludge reservoirs, low-potential thermal energy of mine groundwaters and associated raw materials from desalination waste. Methods. The research uses an integrated approach, which includes an analysis of existing experience and available complex coal mining technologies, laboratory studies of mine water desalination technology by the reverse osmosis method with thermal distillation of concentrated brine, and chemical analysis using ElvaX laboratory equipment. Findings. This paper presents the research results of a comprehensive analysis of mineral raw material resources related to coal mining. The technically achievable energy potential that can be produced from the secondary coal of rock dumps and sludge reservoirs has been determined, which in total is 183.3 TJ. The annual heat potential of methane gas utilization has been estimated, which in total of PJSC DTEK Pavlohradvuhillia’s mines reaches 7.1 PJ. The possibility of extracting up to 1.12 TJ/year of associated thermal energy from the water-drainage installation of mine complexes has been determined. For the conditions of the Zakhidno-Donbaska mine, the authors of the paper have developed a technological scheme for the water preparation process by the reverse osmosis with the desalination brine treatment by the method of multistage evaporation on adiabatic evaporators. Originality. For the first time, the energy flows related to coal mining technology have been comprehensively analyzed for the possibility of their joint use to cover the needs of the mine complex. The prospects for complex mining of mineral resources have been assessed based on the adaptation of the mine complex production facilities to the multi-product production of clean drinking water, utilization of methane gas, low-potential thermal energy from mine groundwaters and secondary raw materials of desalination waste. Practical implications. The proposed set of technological solutions will ensure the sustainable development and diversification of the production of PJSC DTEK Pavlohradvuhillia coal-mining enterprises, as well as the effective transformation of coal-mining cities during the period of transition from mono-product production to the creation of multi-business production complexes that comply with ESG principles. The creation of multi-product mine complexes capable of producing not only coal, but also heat and associated mineral raw material resources, should become a guarantee of stable social-economic development of coal-mining regions.

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Section: Introductionmentioning

confidence: 99%

A new concept for complex mining of mineral raw material resources from DTEK coal mines based on sustainable development and ESG strategy

Bondarenko¹,

Salieiev²,

Kovalevska³

et al. 2023

Min. miner. depos.

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“…Such a volume of cavities affects the change in the geodynamic and seismic conditions in the earth's crust. There is a hypothesis that dynamic processes in cavities cause catastrophic phenomena similar to the rock ice slide of the Kolka Glacier in the Karmadon Gorge of North Ossetia and others [14], [15].…”

Section: Introductionmentioning

confidence: 99%

Substantiation of mining-technical and environmental safety of underground mining of complex-structure ore deposits

Lyashenko¹,

Andreev²,

Dudar³

2022

Min. miner. depos.

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Purpose. Substantiation of mining-technical and environmental safety of underground mining of complex-structure ore deposits based on the study of a rock mass stress-strain state (SSS), as well as determining the safe parameters of stopes for specific mining-geological conditions and patterns of rock pressure propagation in various environments. Methods. To assess the improvement of mining-technical and environmental safety of mining operations, the research includes theoretical generalizations with the use of mathematical statistics, physical and mathematical modeling, performing calculations, as well as technical and economic feasibility, laboratory and full-scale experimental studies, industrial tests in mine conditions and on the earth's surface in the zone of blasting influence, based on the standard and new methods. Findings. A functional interrelation between the rock mass SSS value and the number of impulses (destruction sounds) per minute, characterizing its structural (а) and strength (b) properties, is proposed, which is described by a curvilinear dependence of the type y = axb and allows to quickly determine the stable parameters of stopes. Assessment and prediction are made for various forms of rock pressure manifestation, based on the stress concentration coefficient within 0.91 Kv 0.70, taking into account the conditions of the elastic behavior of rocks. The value of = 0.0002-0.0003 is taken as permissible relative deformation, which ensures both mining-technical and environmental safety, as well as the rock mass stability during repeated blasting operations. Originality. A classification of the rock mass SSS has been developed depending on the direction of the maximum stresses relative to the mine working location, the level of the rock mass stress state and the mechanism of rock pressure manifestation (η), as well as the category of rock-bump hazard. In particular, the rock mass with the values in the range oof 0.12 < η ≤0.2; 0.2 < η ≤ 0.3; 0.3 < η ≤ 0.5 and η > 0.5 are classified as non-rock-bump hazardous and belong to III, II, and I hazard categories, respectively. Practical implications. To substantiate the safe parameters of stopes based on the results of multi-year research into underground mining of complex-structure deposits, depending on the rock mass properties, a graphical-analytic method (nomographic charts and calculation formulas) is recommended. These parameters are determined for highly fractured, medium fractured and weakly fractured rock mass with its horizontal outcropping to the surface. Using this method, the Instruction on the Geomechanical Substantiation of the Safe Mining of the Reserves at the Skhidnyi Hirnycho-Zbahachuvalnyi Kombinat, DP (SE VostGOK), Ukraine, has been developed.

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Our sustainable coronavirus future

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Method for optimizing the protecting pillars parameters in underground coal mining

Cited by 4 publications

References 13 publications

A new concept for complex mining of mineral raw material resources from DTEK coal mines based on sustainable development and ESG strategy

A new concept for complex mining of mineral raw material resources from DTEK coal mines based on sustainable development and ESG strategy

Substantiation of mining-technical and environmental safety of underground mining of complex-structure ore deposits

Our sustainable coronavirus future

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