Conceptual development of the transition from drill and blast excavation to non-blasting methods for the preparation of mined rock in surface mining

Sobko, B; Ложніков, Олексій Володимирович; Levytskyi, Volodymyr; Skyba, G. V.

doi:10.17794/rgn.2019.3.3

Cited by 12 publications

(8 citation statements)

References 6 publications

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“…Changes in the rock mass stress is identified by means of identity of values obtained between them. Accuracy of the final results is provided owing to the use of the relevant principles of elastoplastic or plastic deformations and densification or coarsening of networks of the solids depending upon the required accuracy of the final results [64]- [66].…”

Section: Figure 1 3d Section Of the Rock Mass Models In Terms Of Long-pillar Mining Of N7 B Coal Seam Using The Double-unit Longwallsmentioning

confidence: 99%

Research into stress-strain state of the rock mass condition in the process of the operation of double-unit longwalls

Dychkovskyi¹,

Shavarskyi²,

Saik³

et al. 2020

Min. miner. depos.

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To substantiate changes in stress-strain state of rock mass in the process of long-pillar mining with the help of double-unit longwalls while evaluating stress of a mine field in terms of Lvivvuhillia SE mine. Methods. Analysis of the plans of mine workings has become a basis for the evaluation of physical and geometrical parameters of a support pressure area of the double-unit stopes depending upon mining and geological as well as engineering conditions for n 7 b coal seam extraction. 3D model of the rock mass has been rendered using SolidWorks 2019 software. The geomechanical model of the rock mass is based upon the specified output data concerning actual operating schedule of 1018 and 1019 double-unit longwalls (numbers of the longwalls are changed as it has been required by the authorities of Lvivvuhillia SE) in terms of n 7 b seam and support patterns of the development mine workings in Lvivvuhillia SE mine. Each component of the support was modeled as a separate part with the relevant geotech data. Behaviour of the expansion of the rock mass stress-strain state within the selected point has been analyzed by means of sections at the specified plane. Findings. Rendering algorithm of 3D model of rock mass in terms of long-pillar mining of a coal seam using double-unit longwalls has been developed. A geomechanical model of the rock mass has been substantiated depending upon the mining and geological mode of occurrence and engineering parameters of coal mining process. Originality. Nature of the support pressure area formation in front of a stope as well as along the extraction pillar length has been analyzed. It has been identified that if stopes are within one and the same plane, interconnection of their frontal support pressure areas as well as walls of the development workings take place. In this context, adjoining entry acts as the extra destressing technogenic cavity in addition to its proper functions. Practical implications. Output data to make recommendations concerning the efficient mining parameters and methods for rock pressure control have been identified relying upon the analysis of stress-strain state of rock mass in the process of the operation of double-unit longwalls. Visualization of the principles of formation of the stress-strain state of support pressure area and evaluation of the rock mass condition have shown that the maximum reduced stresses reach 70 MPa in terms of 18 m width of the support pressure area.

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Section: Figure 1 3d Section Of the Rock Mass Models In Terms Of Long-pillar Mining Of N7 B Coal Seam Using The Double-unit Longwallsmentioning

confidence: 99%

Research into stress-strain state of the rock mass condition in the process of the operation of double-unit longwalls

Dychkovskyi¹,

Shavarskyi²,

Saik³

et al. 2020

Min. miner. depos.

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“…When drilling for oil, gas, and water and during the extraction of other minerals, rock is ruined and brought to the surface by the washing liquid because of the metal drill bit-rock interaction. The rigidity of the drill string, and hence the interaction between the drill bit and the rock, is dependent on the material of the drill pipe (the most commonly used are: steel of different strength groups, such as steel 40 KhN, aluminum alloys AD31 and duralumin D16T, titanium alloy VT1-0 as well as magnesium alloys and composite carbon materials) [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Influence of Heavy Weight Drill Pipe Material and Drill Bit Manufacturing Errors on Stress State of Steel Blades

et al. 2021

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Drilling volumes should be increased in order to increase hydrocarbon production, but this is impossible without the usage of high-quality drilling tools made of modern structural materials. The study has to analyze the design, technological and operational methods to increase the performance of drilling tools made of various materials and has highlighted prospects of technological method applications. The scientific novelty of the study consists in the development of a new analytical model of PDC drill bit–well interaction. The developed model takes into account the drill bit manufacturing errors in the form of bit body–nipple axes misalignment on the drill bit strength. This result makes it possible to determine the permissible manufacturing errors to provide safe operation of the drill bit. It is established that there is an additional transverse force that presses the drill bit to the well wall in the rock due to manufacturing errors. It is determined that the magnitude of this clamping force can be significant. The material effect has been analyzed on additional clamping force. It is established that geometric imperfection of the drill bit causes the minimal effect for the elastic system of the pipe string, which includes a calibrator and is composed of drill pipes based on composite carbon fiber material, and the maximal effect—for steel drill pipes. Polycrystalline diamond compact (PDC) drill bit and well wall contact interaction during operation in non-standard mode is considered. Non-standard stresses are determined, and the strength of the blades is estimated for different values of drilling bit manufacturing error.

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“…It has been proved that complex optimization, in contrast to the deterministic approach, is more effective. Under these conditions, the possibilities of planning, designing and increasing the efficiency of mass explosions are greatly expanded due to the use of the latest communication technologies and computer systems, laser measuring technologies, drilling machines equipped with GPS, new explosives, charge structures and means of their controlled explosion, measuring the effectiveness of explosives and assessing the explosin results [8], [9].…”

Section: Introductionmentioning

confidence: 99%

Applied scientific and systemic problems of the related ore-dressing plants interaction in the event of decommissioning the massif that separates their quarries

Azarian¹,

Lutsenko²,

Zhukov³

et al. 2020

Min. miner. depos.

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Determining the possible and substantiating expedient alternate design and engineering decisions regarding the stage of spacial union of the adjacent quarries belonging to various owners by mining the rock pillar between the No. 3 quarry of PJSC "ArcelorMittal Kryvyi Rih" and the quarry of PJSC "Southern Mining Factory" with involvement into mining the reserves, extraction of which is possible within the existing mining and land allotments. Methods. It was used an integrated methodological approach, including mining and geological analysis of the rock massif between two adjacent quarries, which is subject to decommissioning; technical-economical analysis of the operational efficiency of the ore-dressing plant when decreasing the ore mine productivity as a result of cleaning-up the deposit; theoretical substabtiation of design and engineering decisions regarding the quarry objects parameters in the specified conditions and with the efficient development of a rock pillar that separates quarries. Findings. The state of the projects and plans for the development of mining operations in the No. 3 quarry of PJSC "Arce-lorMittal Kryvyi Rih" and the quarry of PJSC "Southern Mining Factory" has been analyzed, which, in the coming years, indicates their spacial union. It has been revealed that the decommissioning of the rock pillar between the quarries is complicated both spacely and technologically, especially as a result of seismic restrictions, but the proposed solutions and measures simplify and make safe this stage as much as possible. The problem has been defined of reduce in the loading at the dressing plants proportionally to the decline in ore output. The technical-economical calculations substantiate that the corresponding sequential decommissioning the enrichment sections of the ore-dressing plants is expedient at one of the two cooperating ore mining and processing plants.Originality. An integrated approach has been improved regarding the evolution of mining and processing enterprises at the stage when their quarries approach to the maximum depths and final contours by taking into account adjacent ore mines as a single complex dynamic system. The analytical substantiation of drilling and blasting technology of the rocks destruction has been adapted to the specific conditions of decommissioning the pillar adjacent to both quarries. Practical implications. It is distinguished their high level of suitability for implementation and use in the designing of mining operations development in the quarries of PJSC "ArcelorMittal Kryvyi Rih" and PJSC "Southern Mining Factory".

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Conceptual development of the transition from drill and blast excavation to non-blasting methods for the preparation of mined rock in surface mining

Cited by 12 publications

References 6 publications

Research into stress-strain state of the rock mass condition in the process of the operation of double-unit longwalls

Research into stress-strain state of the rock mass condition in the process of the operation of double-unit longwalls

Influence of Heavy Weight Drill Pipe Material and Drill Bit Manufacturing Errors on Stress State of Steel Blades

Applied scientific and systemic problems of the related ore-dressing plants interaction in the event of decommissioning the massif that separates their quarries

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