Modeling of the disjunctive geological fault influence on the exploitation wells stability during underground coal gasification

Dychkovskyi, Roman; Lozynskyi, Vasyl; Saik, Pavlo; Petlovanyi, Мykhailo; Malanchuk, Yevhenii; Malanchuk, Zinovii

doi:10.1016/j.acme.2018.01.012

Cited by 42 publications

(28 citation statements)

References 21 publications

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“…where h w i is the i-th working height (width), m. Thus, the crown thickness should be increased to 11.2, 11.4, 11.6 and 11.8 m respectively [36][37][38][39].…”

Section: Methodsmentioning

confidence: 99%

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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“…where h w i is the i-th working height (width), m. Thus, the crown thickness should be increased to 11.2, 11.4, 11.6 and 11.8 m respectively [36][37][38][39].…”

Section: Methodsmentioning

confidence: 99%

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

et al. 2020

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“…Analysis of formula (8) enables concluding that: -when pressure in the upper part of the mining block decreases, after caving the crown, movement of rock mass is observed in both directions (according to the research into breaking ore in the compressed environment) [21,26,40]. That is, not only caved ore but also caved rocks will be compacted; -when pressure in the upper part of the mining block increases, after caving the crown, rock mass will move towards areas with lower rock pressure [36][37][38][39][40].…”

Section: Resultsmentioning

confidence: 99%

“…To reduce costs for maintaining main openings, mines implement modern methods of monitoring the rock massif state while disturbing it by underground operations [37][38][39].…”

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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“…Due to this, the international scientific community is actively conducting the research focused on the transition to alternative fuels and on searching for additional sources of conventional energy resources (Bondarenko, Svietkina, & Sai, 2017). But nobody has invented another type of fuel yet that can be an optimal substitute for conventional fuels, so the development of new ways to extract conventional fuel is becoming the primary task (Bondarenko, Maksymova, & Koval, 2013;Dychkovskyi et al, 2018). The methanecontaining gas hydrate is such an additional energy resource that can solve the above mentioned problem (Ovchynnikov, Ganushevych, & Sai, 2013;Zhao, Song, Lim, & Lam, 2017).…”

Section: Introductionmentioning

confidence: 99%

Selecting the method of gas hydrate deposits development in terms of the regularities of their formation

Maksymova¹

2018

Min. miner. depos.

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Purpose. To establish and show regularities of gas hydrates fields distribution in the World Ocean for the development of flow diagrams of methane extraction depending on genetic structures and the composition of the host rocks.Methods. The analysis of the existing fields of gas hydrates is made and, in view of impossibility to carry out detailed investigation, an opportunity to develop them is proved, a theoretical approach to a preliminary estimation of mining-and-geological conditions of such fields' excavation is developed. Findings.On the basis of the data obtained in the suggested way, it becomes possible to calculate the necessary technological parameters of processes related to deposits' opening and gas production from the bottom of the World Ocean.Originality. At the present stage of the research into a new alternative and the most promising source of energy, in the total absence of experience in the gas hydrates fields development, great practical significance is attached to the classification of fields by mining-and-geological conditions of their occurrence, as well as to the methodological approach to their development and calculation of technological parameters of methane extraction process from the bottom of the World Ocean with minimum effect onto the Earth's hydrosphere.Practical implications. Types of gas hydrates fields are determined for the first time in terms of mining-and-geological conditions of their development on the basis of genetic origin and structure of the host rocks. A theoretical approach to the description of the processes taking place in the seam during gas hydrates fields development is elaborated.

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Modeling of the disjunctive geological fault influence on the exploitation wells stability during underground coal gasification

Cited by 42 publications

References 21 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

Selecting the method of gas hydrate deposits development in terms of the regularities of their formation

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