Studying the efficiency of a complex individual protective device

Cheberiachko, Serhii; Yavorska, Olena; Hridiaiev, Volodymyr; Yavorskyi, Andrii

doi:10.1051/e3sconf/201912301028

Cited by 3 publications

(3 citation statements)

References 3 publications

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“…Removal of the dump landslide to the boundaries of the land allotment can lead to repeated manifestations of rock slide. The dump will be in limit equilibrium, which is dangerous for machinery and people working at the bottom of the dump [31][32][33][34].…”

Section: Recommendations For the Obtained Data On The Stability Of The Dump Slopesmentioning

confidence: 99%

Determination of economically viable option of liquidation the consequences of external dump deformation

et al. 2021

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The safety factors for different variants of operation development were obtained, on the basis of which the technical and economic indicators were established and the most expedient way of restoration of dump operations in conditions of the formed landslide was chosen. The solutions were proposed for the external dump No 2 of the Central Ore Mining and Processing Enterprise (COMPE), that allow to continue its future operation. When working in the conditions of the formed landslide, three variants of the further dump operation are modeled: the first one - with landslide removal and unloading of the upper dump horizons, the second one - without landslide removal and involvement of disturbed lands in land allotment, the third one - with the landslide loading. Based on the built sections of the dump and defined physical and mechanical properties, the stability factors were obtained for different options of the operation development, which made it possible to determine the appropriate option to eliminate the effects of the dump slide deformations. As a result of the calculations, the cost flows for each of the proposed options of the formation of the end contour of the dump No 2 are determined.

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Section: Recommendations For the Obtained Data On The Stability Of The Dump Slopesmentioning

confidence: 99%

Determination of economically viable option of liquidation the consequences of external dump deformation

et al. 2021

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“…Moreover, it should be noted that an important component of this cycle is to ensure an acceptable ecological state of the territories within which the solid fuel deposits are concentrated [9]- [12] while maintaining the safety of workers [13].…”

Section: Introductionmentioning

confidence: 99%

Mathematical model and methods for solving heat-transfer problem during underground coal gasification

Saik¹,

Berdnyk²

2022

Min. miner. depos.

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Purpose. A mathematical model development for heat transfer during underground coal gasification based on the transcendental equation solution by the Newton-Raphson method. Methods. The heat-transfer model development is based on the research into a temperature field with a variable size of the gasification zone when passing through the phase transformation boundary, which changes abruptly. The research on the coal seam T(x, t) temperature field and the displacement length of the phase transition boundary S(t) is based on the integration of the differential heat-transfer equation with the fulfillment of one-phase Stefan problem conditions. The proportionality factor (β), characterizing the ratio of the displacement length of the “generator gas – coal” phase transition boundary to the time of coal seam gasification, is determined by substituting the Boltzmann equation and using the Newton-Raphson method based on solving the obtained transcendental equation. Findings. The main problems related to laboratory research on the coal gasification process have been identified. A mathematical model of heat transfer during underground coal gasification for a closed georeactor system has been developed, taking into account the effective change in its active zones. Originality. A mathematical model of heat transfer during underground coal gasification at the phase transition boundary has been developed, under which the one-phase Stefan problem conditions are fulfilled. Dependences of the change in the underground gas generator temperature, taking into account the change in the active zones of chemical reactions along the length of the combustion face and the gasification column, have been revealed. In addition, the dependences of the change in the phase transition boundary of a “generator gas – coal” heterogeneous system have been determined, which characterize the displacement length of the phase transition boundary on time and reveal the relationship between the thermal conductivity coefficient, specific heat capacity, as well as bulk density of coal and its calorific value. Practical implications. A method has been developed to determine the displacement length of the phase transition boundary of a “generator gas – coal” heterogeneous system and its relationship between the time and temperature of gasification process. This makes it possible to predict in the future the change in the active zones of the underground gas generator along the length of the gasification column.

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“…At the same time, the design parameters of the roads (for ex ample, slopes, horizontal platforms for stopping dump trucks, etc.) are taken in accordance with the requirements of regula tory legal acts on labor protection [5].…”

mentioning

confidence: 99%

Research on the rational profile of exit trails of auto transport in deep open mines

Pavlychenko¹,

Шустов²,

Kaliuzhna³

et al. 2022

Nauk. visn. nat. hirn. univ.

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Purpose. Technical and economical justification of the parameters of the profile of exit trails without horizontal sections in the operation of road transport in deep open mines. Methodology. To solve the objectives, the following methods were used: analytical, graphic methods, mathematical modeling, comparison of options, and analogies. These research methods are used when studying and justifying of a rational profile of exit trails of auto transport in the open mine, as well as defining the width of the working platforms of the excavator, and doing technical-economical calculations of the proposed solutions. Findings. Based on the performed analysis of parameters determining the distance of transportation of rock mass, it was found that when using the exit trails without horizontal sections, the transportation distance is 300 m, and with horizontal sections 531.3m, which exceeds the former by 1.77 times. The trip time when using the transportation scheme without horizontal sections is 7.44 min, and when using it with horizontal sections, it is 8.42 min. It is proved that the use of exit trails without horizontal sections in the open mine of Poltava Mining and Processing Plant reduces the cost of diesel fuel by 42.57% and capital costs by 40.5%. Originality. A comparison of the actual distance of transportation, and time of dump truck trip by component operations is carried out, and expenses for maintenance of open mine roads when using trails with horizontal sections and without them are calculated. The scheme of exit trails without horizontal sections has been offered for the first time, which allows a reduction in the distance of transportation of rock mass by dump trucks with a reduction of rock volume for carrying out conventions by 57%. Practical value. The developed scheme of the route profile without horizontal sections can be applied to overburdening operations, and the development and deepening of open mines for the extraction of different types of minerals, such as iron ore and hard coal. The expected economic effect from the introduction of trails without horizontal sections is determined by the reduction of diesel fuel costs by 52.9 UAH/t.km, and accordingly 1.68 million UAH for the conduction of conventions.

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Studying the efficiency of a complex individual protective device

Cited by 3 publications

References 3 publications

Determination of economically viable option of liquidation the consequences of external dump deformation

Determination of economically viable option of liquidation the consequences of external dump deformation

Mathematical model and methods for solving heat-transfer problem during underground coal gasification

Research on the rational profile of exit trails of auto transport in deep open mines

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