Combined Roof-Bolting Systems of Mine Workings: Monograph

Bondarenko, Volodymyr; Kovalevska, Iryna; Symanovych, Hennadiy; Barabash, Mykhaylo; Chervatiuk, V.; Husiev, O.; Snihur, V.

doi:10.1201/9781003081432

Cited by 5 publications

(12 citation statements)

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“…According to the quality factor, the parameters of the distribution components of stress deformations correspond to the existing representation of the rock mass deformation processes around the mine working [27], [28], [29]. The results obtained do not contradict numerous geomechanical studies in this area [30], [31], [32], [33], [34], [35]. This confirms the correspondence of the model to the real conditions of mining operations in coal mines.…”

Section: Problem Statement and Solutionsupporting

confidence: 68%

Substantiating arched support made of composite materials (carbon fiber-reinforced plastic) for mine workings in coal mines

Bondarenko

Kovalevska²,

Podkopaiev³

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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This paper studies a new composite materials based on carbon fiber-reinforced plastic, which is planned to be used for supporting the preparatory workings when mining the coal at depths of more than 1000 meters. The composite material made of carbon fiber-reinforced plastic has sufficient lt high physical-mechanical properties, which are even higher than that of low-alloy steel used as the main material for supporting in coal mines. The purpose of the research is to substantiate the model of support (arched three-link) and determine its rational parameters. The calculation of the stress-strain state around mine working, using the support made of composite materials, has been perfomed based on the method of finished elements in the Solid Works software product. In addition, a model of the support for coal mines has been developed on a 3D-printer. This made it possible to conduct additional research on the interaction of the support with the rock mass. Using the Solid Works software, a detailed modeling of the composite supporting system has become possible. The stress-strain state of the rock mass has revealed that support can be used to improve the strength characteristics and prevent uneven pressure distribution around mine workings. A support made of composite materials contributes to the introduction of resource-saving technologies in the mining industry.

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Section: Problem Statement and Solutionsupporting

confidence: 68%

Substantiating arched support made of composite materials (carbon fiber-reinforced plastic) for mine workings in coal mines

Bondarenko

Kovalevska²,

Podkopaiev³

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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“…Virtasalmi deposit of base metal ores performs open pit and underground mining operations to the full depth, (figure 4) [30]. To the depth of 175 m, both open pit and underground methods were applied with transportation of extracted rock mass from the underground part to the surface along the ramp.…”

Section: Analysis Of Researches and Publicationsmentioning

confidence: 99%

Iron ore underground mining under the internal overburden dump at the PJSC “Northern GZK”

Pysmennyi

Chukharev²,

Kyelgyenbai³

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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Deterioration of mining conditions at mining deposits by open pit methods (increased mining depths, reduced ore deposit thickness) leads to an increase in mining costs. In Ukraine, to reduce open pit mining costs, overburden is disposed in temporary internal dumps located directly in the open pit over the ore reserves. Reactivation of pit areas with the temporary internal overburden dump located on them results in a surge of mining operations and deterioration of technical and economic indicators. Increased energy consumption, a decrease in working site parameters, an increase in angles of open pit slopes and stripping lags lead to unprofitability of open pit mining. One of the solutions to the mentioned scientific and engineering problem involves combined mining of deposits by integrated open pit and underground mining operations. The combined open pit-underground mining method enables reducing mining costs and enhancing technical and economic indicators. The suggested schemes for opening reserves located under the internal overburden dump enhance technical and economic indicators of deposit mining through making the internal dump a permanent one. This allows further disposal of overburden into internal dumps. Implementation of scientific recommendations and technological solutions resulted from the research performed (exemplified by the deposit Hannivske, Ukraine) reduces the cost of ore by 1.33 USD/t. At the same time, the total cost of building an underground mine makes 16.4 M USD, which is 30% less than when applying traditional opening vertical shaft schemes.

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“…It can lose stability at a certain value of the rock layer deflection, and, when the flexure strains are restricted (by means of a bearing from the side of underlying massif), this thrustblock system has a significant load-bearing capacity and actively resists to geostatic vertical rock pressure. The formation mechanism of thrust systems constituting the hinged-block displacement zone is described in sufficient detail in the works [19,[24][25][26][27][28], and the adequate reflection of this zone in models of this class of geomechanics problems is of great interest for us.…”

Section: Problem Statement and Solutionmentioning

confidence: 99%

“…The question remains relative to the geometrical parameters of the hinged-block displacement zone, which are recommended on the basis of existing concepts on the mechanism of the rocks displacement in the coaloverlaying formation with specification for the Western Donbas conditions in accordance with studies [19,[24][25][26][27][28].…”

Section: Problem Statement and Solutionmentioning

confidence: 99%

“…In the protecting pillar longitudinal section (for example, to the rise of the seam), the same principles to substantiate the block dimensions (usually from 2 m to 8 m) are recommended with a different general tendency of the block length increase when removing from the coal seam. Here, according to [24][25][26], the maximum stresses concentrations in the former frontal bearing pressure zone are propagated to depth of a pillar by 5 -10 m. Over time, the line (by the coal-overlaying formation thickness) of their maxima is located at an angle of 70 -75º to the horizontal, which will be the boundary of the hingedblock displacement zone from the side of the seam rise. From the opposite side, the vast dimensions of the minedout space with a sufficiently constant texture of the hinged-block displacement zone make it possible to restrict the dimensions of its reflection to 30 -40 m.…”

Section: Problem Statement and Solutionmentioning

confidence: 99%

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Principles for certain geomechanics problems solution during overworking of mine workings

et al. 2021

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This paper deals with two relevant and interrelated directions of coal mining development. Firstly, the resource-saving complete extraction of reserves, and secondly, the intensification of mining activity through mining operations conducted on several seams. The objective of overworking of mine workings with a real representation of mining-and-geological and mining-engineering conditions has been formulated. Five peculiarities of the geomechanical models construction for overworking of mine works have been revealed and substantiated. The technology for performing a series of computational experiments is proposed. The task of the protecting pillar influence, which is located in overlying coal seam, on the state of mine working placed in the underlying coal seam has been solved. An optimal scheme for its maintenance is proposed.

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Combined Roof-Bolting Systems of Mine Workings: Monograph

Cited by 5 publications

References 0 publications

Substantiating arched support made of composite materials (carbon fiber-reinforced plastic) for mine workings in coal mines

Substantiating arched support made of composite materials (carbon fiber-reinforced plastic) for mine workings in coal mines

Iron ore underground mining under the internal overburden dump at the PJSC “Northern GZK”

Principles for certain geomechanics problems solution during overworking of mine workings

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