Analytical Research of the Stress-Deformed State in the Rock Massif around Faulting

Lozynskyi, Vasyl; Saik, Pavlo; Petlovanyi, Мykhailo; Sai, Kateryna; Malanchuk, Yevhenii

doi:10.4028/www.scientific.net/jera.35.77

Cited by 71 publications

(59 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…the room) and, on the opposite, harder ores tend to accumulate stress due to smaller deformations. However, stability of less hard ore crowns decreases due to reduction of their ultimate strength [12][13][14].…”

Section: Methodsmentioning

confidence: 99%

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

et al. 2020

View full text Add to dashboard Cite

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.

show abstract

Section: Methodsmentioning

confidence: 99%

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

et al. 2020

View full text Add to dashboard Cite

show abstract

“…The technique of determining the line of the least resistance and distances between borehole ends should be applied when determining parameters of blasting and drilling operations [25,36,37,40].…”

Section: Resultsmentioning

confidence: 99%

“…from 56% to 62%) [19][20][21]. This updating trend is based on force impacts on the substance during disintegration in the activator but it does not consider processes connected with underground mining of the useful mineral [22][23][24][25]. Constantly improved software of the automated complexes indicates iron content in real time and is able to split ore mass flows by quality.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

View full text Add to dashboard Cite

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.

show abstract

“…where q n -quantity of an explosive at undermining of a massif with n the bared surfaces, kg/t; q -quantity of an explosive at undermining of a massif with one bared surface, kg/t; n -quantity of the bared surfaces, pieces. If the bared surface faces broken-down rocks in this case fading of amplitude of waves of stresses there will be something smaller, than in a case with the bared surface of considerable width [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Ways of increase of efficiency of drilling-and-blasting

Rymarchuk

Shepel

2020

E3S Web Conf.

View full text Add to dashboard Cite

Results of theoretical researches and industrial experiments on technology of breaking of a massif with use of the artificial screens formed by lumbago of blasthole charges are resulted. In research the technology of breaking of ore by means of the vertical concentrated charges (VCC) on in advance formed screens is offered at underground mining. Possible ways of improvement of technology of working of deposits which will provide reduction of a production cost of ore are considered. The effective variant of a location of chisel developments, charges of the vertical concentrated charges (VCC) and artificial screens in the block is considered. It is analyzed the basic variants of formation of a shielding layer at breaking of ore by fans of deep boreholes and a location of boreholes in the coupled fan. The effective sequence of breaking of ore and necessary parameters of drilling-and-blasting is offered at underground mining. Comparison of results of measurements of granules of metric structure of the crushed mass on experimental sites of an ore mine is considered, analyzed and spent. The method of increase of efficiency of passage of the reflected and broken waves through the screen is offered at ore breaking. The considerable effect from explosion of charges in the presence of zones of unloading is resulted with is artificial they formed screens at massif destruction by the vertical concentrated charges.

show abstract

Analytical Research of the Stress-Deformed State in the Rock Massif around Faulting

Cited by 71 publications

References 23 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

Ways of increase of efficiency of drilling-and-blasting

Contact Info

Product

Resources

About