Defectoscope for monitoring of a concrete timbering of underground constructions

Serhiienko, Viktor

doi:10.1051/e3sconf/201910900084

Cited by 4 publications

(4 citation statements)

References 3 publications

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“…3, b) and α = 60º ( Fig. 4, b) the volume of rock falls will make from 150 to 200…220 m 3 , sometimes to 400…450 m 3 respectively [16][17][18]. These values testify to the critical condition of the crown at angles about α = 70º, at about α = 60º the crown will fail.…”

Section: Methodsmentioning

confidence: 91%

The study of the stress-strain state of the massif in mining uranium at “VOSTGOK” deposits

et al. 2020

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Being one of the world's largest uranium producers(about 2% of the world's production), the state enterprise "Vostochnyi Mining and Processing Works" ("VostGOK") provides about 40% of Ukraine's nuclear power stations with uranium raw materials. Considering the conditions of uranium deposits exploitation (location in densely populated areas, protected sites etc.), to protect the environment from possible emissions of radioactive elements room mining is applied with subsequent backfilling of the dead area with consolidating mixtures. This technology is economically reasonable at deposits with the increased uranium content. To exclude a number of labour-consuming and environmentally dangerous operations from the production process, lean uranium-containing ores are reasonable to be mined applying underground block leaching. This enables reaching maximum values of mineral extraction and avoiding considerable material expenditures on backfilling mixture preparation and backfilling dead rooms, as they are almost completely backfilled with the muck pile, and on utilization of waste after the mined ore primary processing (barren rocks and off-balance ores) on the daylight surface.

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Section: Methodsmentioning

confidence: 91%

The study of the stress-strain state of the massif in mining uranium at “VOSTGOK” deposits

et al. 2020

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“…Such techniques differ in breaking conditions and estimation criteria. Thus, when mining iron ore deposits, there are applied methods based on placing explosives in the massif depending on stress concentration, rock hardness, qualitative characteristics of explosives, etc [15,16,37].…”

Section: Resultsmentioning

confidence: 99%

“…Works [11][12][13][14][15] suggest various options of mining systems enabling increase of extraction of ore mass from stope blocks. However, blocks fail under the influence of rock pressure when forming the compensatory area, thus causing increased mining costs and time.…”

Section: Introductionmentioning

confidence: 99%

Development of resource-saving technology when mining ore bodies by blocks under rock pressure

et al. 2020

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The article aims to develop the resource-saving technology when mining steep ore bodies applying 250 mm-diameter boreholes to break ore into the compressed environment. This will reduce dilution of the mined ore mass in conditions of rock pressure around blocks. When mining iron ore deposits of Kryvyi Rih basin, applied mining systems allow for creation of the compensatory space as the first stage. However, these stopes fail under rock pressure, this influencing negatively ore breaking and extraction. The degree of extraction can be increased through breaking ore mass into the compressed environment. The width of the ore layer to be broken onto the compressed environment is determined through industrial investigations. To enhance breaking conditions, it is suggested to apply boreholes of a larger diameter. However, there is no technique developed for determining thickness of the ore layer to be broken depending on the borehole diameter and the fragmentation factor. When applying 250 mm boreholes, increase of thickness of the layer to be broken from 2 to 10 m is found to cause compaction of the previously broken layer up to 3 m with the optimal ore fragmentation factor of 1.3-1.5 and 3-fold decrease of lumps yield. This results from the fact that drilling a 250 mm borehole to secure even provision of the massif with explosives reduces the line of the least resistance.

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“…One of the tasks of the research was to create the most simple and cheap means of control. From the point of view of hardware implementation, the simplest of the possible physical parameters is to determine the period of time [21].…”

Section: Fig 2 Fragment Of Support With Reinforced Concrete Slabsmentioning

confidence: 99%

Science and Practice for Assessing the State of Underground Structures Support by Vibroacoustic Method

Krukovskyi¹,

Skipochka²,

Serhiienko³

et al. 2023

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In this work, subject of the research is a method of non-destructive vibroacoustic control of underground structures support. The purpose of the research was to create a methodology and apparatus for vibroacoustic control of the state of the system "support – rock massif" with a wide range of use. The main types of objects where the use of this method is appropriate are determined. Negative influence of external factors on performance characteristics of support is shown. A basic type of support for underground objects is reinforced concrete. It is established that the most characteristic defects are formation of cavities in geological environment behind the support and broken connection of separate segments of the support. The influence of these defects on character of free oscillations of support elements at single shock action was studied theoretically. It is established that the following parameters can be informative for detecting these defects: amplitude characteristic of package of vibration, its duration and spectral composition. Information about the means of vibroacoustic control designed by the Institute with participation of the authors is provided. The methodical features of using vibroacoustic control for assessing technical state of different types of support are considered. The limitations for using the method are explained. Some results of the use of vibroacoustic control of support in underground objects of the various purposes are given.

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Defectoscope for monitoring of a concrete timbering of underground constructions

Cited by 4 publications

References 3 publications

The study of the stress-strain state of the massif in mining uranium at “VOSTGOK” deposits

The study of the stress-strain state of the massif in mining uranium at “VOSTGOK” deposits

Development of resource-saving technology when mining ore bodies by blocks under rock pressure

Science and Practice for Assessing the State of Underground Structures Support by Vibroacoustic Method

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