Energy principle of simulation experiments on coal and gas outburst
| Title: | Energy principle of simulation experiments on coal and gas outburst |
|---|---|
| Authors: | Yuanping CHENG, Yang LEI, Sijie YANG |
| Source: | Meitan xuebao, Vol 48, Iss 11, Pp 4078-4096 (2023) |
| Publisher Information: | Editorial Office of Journal of China Coal Society, 2023. |
| Publication Year: | 2023 |
| Collection: | LCC:Geology LCC:Mining engineering. Metallurgy |
| Subject Terms: | coal and gas outburst, gas expansion energy, experimental apparatus, energy principle, outburst mechanism, Geology, QE1-996.5, Mining engineering. Metallurgy, TN1-997 |
| More Details: | Coal and gas outburst is an extremely destructive gas dynamic disaster in mines. Since such dynamic disasters are usually difficult to observe directly, physical similarity simulation of coal and gas outburst has become an important method for collecting observational data on outburst and studying outburst mechanisms. However, the energy principles of outburst similarity simulation experiments still lack systematic research. A review of outburst simulation experiments over the past 70 years revealed that experimental coals generally have a higher porosity (10%–40%, median 21.2%), which significantly increases the expansion energy of the initial free gas stored in the coal pores (by several times to several tens of times). To further elucidate the energy release characteristics of outburst simulation experiments, a series of outburst simulation experiments were conducted using a true triaxial coal and gas outburst simulation system, based on similarity criteria. Combined with observational data and energy analysis, it was found that gas expansion energy is the predominant component of outburst energy, accounting for 87.50%–95.31% of the total energy, of which the contribution of initial free gas accounts for 1/3 to 2/3. This demonstrates that the essence of laboratory simulation experiments is to represent the outburst process as a dynamic process driven by high-pressure gas in coal. Due to the high initial free gas expansion energy resulting from the high porosity of experimental coal, simulation experiments can be induced without relying on stress conditions, and even by non-adsorptive gases (such as He) under low pressure (about 0.45 MPa). In contrast to actual field outburst, simulation experiments often exhibit simultaneous release of gas expansion energy and stress energy, lacking interaction between stress and gas, thus making it difficult to reproduce the excitation process of outburst. In the design of future experimental apparatuses, matching the porosity of experimental coal to that of the original coal seam (usually 1%–11%) is key to whether outburst similarity simulation can achieve breakthrough progress in similarity. |
| Document Type: | article |
| File Description: | electronic resource |
| Language: | Chinese |
| ISSN: | 0253-9993 |
| Relation: | https://doaj.org/toc/0253-9993 |
| DOI: | 10.13225/j.cnki.jccs.2023.0813 |
| Access URL: | https://doaj.org/article/20339a4ac5de4087aa4e6f458d792cf8 |
| Accession Number: | edsdoj.20339a4ac5de4087aa4e6f458d792cf8 |
| Database: | Directory of Open Access Journals |
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| Items | – Name: Title Label: Title Group: Ti Data: Energy principle of simulation experiments on coal and gas outburst – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Yuanping+CHENG%22">Yuanping CHENG</searchLink><br /><searchLink fieldCode="AR" term="%22Yang+LEI%22">Yang LEI</searchLink><br /><searchLink fieldCode="AR" term="%22Sijie+YANG%22">Sijie YANG</searchLink> – Name: TitleSource Label: Source Group: Src Data: Meitan xuebao, Vol 48, Iss 11, Pp 4078-4096 (2023) – Name: Publisher Label: Publisher Information Group: PubInfo Data: Editorial Office of Journal of China Coal Society, 2023. – Name: DatePubCY Label: Publication Year Group: Date Data: 2023 – Name: Subset Label: Collection Group: HoldingsInfo Data: LCC:Geology<br />LCC:Mining engineering. Metallurgy – Name: Subject Label: Subject Terms Group: Su Data: <searchLink fieldCode="DE" term="%22coal+and+gas+outburst%22">coal and gas outburst</searchLink><br /><searchLink fieldCode="DE" term="%22gas+expansion+energy%22">gas expansion energy</searchLink><br /><searchLink fieldCode="DE" term="%22experimental+apparatus%22">experimental apparatus</searchLink><br /><searchLink fieldCode="DE" term="%22energy+principle%22">energy principle</searchLink><br /><searchLink fieldCode="DE" term="%22outburst+mechanism%22">outburst mechanism</searchLink><br /><searchLink fieldCode="DE" term="%22Geology%22">Geology</searchLink><br /><searchLink fieldCode="DE" term="%22QE1-996%2E5%22">QE1-996.5</searchLink><br /><searchLink fieldCode="DE" term="%22Mining+engineering%2E+Metallurgy%22">Mining engineering. Metallurgy</searchLink><br /><searchLink fieldCode="DE" term="%22TN1-997%22">TN1-997</searchLink> – Name: Abstract Label: Description Group: Ab Data: Coal and gas outburst is an extremely destructive gas dynamic disaster in mines. Since such dynamic disasters are usually difficult to observe directly, physical similarity simulation of coal and gas outburst has become an important method for collecting observational data on outburst and studying outburst mechanisms. However, the energy principles of outburst similarity simulation experiments still lack systematic research. A review of outburst simulation experiments over the past 70 years revealed that experimental coals generally have a higher porosity (10%–40%, median 21.2%), which significantly increases the expansion energy of the initial free gas stored in the coal pores (by several times to several tens of times). To further elucidate the energy release characteristics of outburst simulation experiments, a series of outburst simulation experiments were conducted using a true triaxial coal and gas outburst simulation system, based on similarity criteria. Combined with observational data and energy analysis, it was found that gas expansion energy is the predominant component of outburst energy, accounting for 87.50%–95.31% of the total energy, of which the contribution of initial free gas accounts for 1/3 to 2/3. This demonstrates that the essence of laboratory simulation experiments is to represent the outburst process as a dynamic process driven by high-pressure gas in coal. Due to the high initial free gas expansion energy resulting from the high porosity of experimental coal, simulation experiments can be induced without relying on stress conditions, and even by non-adsorptive gases (such as He) under low pressure (about 0.45 MPa). In contrast to actual field outburst, simulation experiments often exhibit simultaneous release of gas expansion energy and stress energy, lacking interaction between stress and gas, thus making it difficult to reproduce the excitation process of outburst. In the design of future experimental apparatuses, matching the porosity of experimental coal to that of the original coal seam (usually 1%–11%) is key to whether outburst similarity simulation can achieve breakthrough progress in similarity. – Name: TypeDocument Label: Document Type Group: TypDoc Data: article – Name: Format Label: File Description Group: SrcInfo Data: electronic resource – Name: Language Label: Language Group: Lang Data: Chinese – Name: ISSN Label: ISSN Group: ISSN Data: 0253-9993 – Name: NoteTitleSource Label: Relation Group: SrcInfo Data: https://doaj.org/toc/0253-9993 – Name: DOI Label: DOI Group: ID Data: 10.13225/j.cnki.jccs.2023.0813 – Name: URL Label: Access URL Group: URL Data: <link linkTarget="URL" linkTerm="https://doaj.org/article/20339a4ac5de4087aa4e6f458d792cf8" linkWindow="_blank">https://doaj.org/article/20339a4ac5de4087aa4e6f458d792cf8</link> – Name: AN Label: Accession Number Group: ID Data: edsdoj.20339a4ac5de4087aa4e6f458d792cf8 |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.13225/j.cnki.jccs.2023.0813 Languages: – Text: Chinese PhysicalDescription: Pagination: PageCount: 19 StartPage: 4078 Subjects: – SubjectFull: coal and gas outburst Type: general – SubjectFull: gas expansion energy Type: general – SubjectFull: experimental apparatus Type: general – SubjectFull: energy principle Type: general – SubjectFull: outburst mechanism Type: general – SubjectFull: Geology Type: general – SubjectFull: QE1-996.5 Type: general – SubjectFull: Mining engineering. Metallurgy Type: general – SubjectFull: TN1-997 Type: general Titles: – TitleFull: Energy principle of simulation experiments on coal and gas outburst Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Yuanping CHENG – PersonEntity: Name: NameFull: Yang LEI – PersonEntity: Name: NameFull: Sijie YANG IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 10 Type: published Y: 2023 Identifiers: – Type: issn-print Value: 02539993 Numbering: – Type: volume Value: 48 – Type: issue Value: 11 Titles: – TitleFull: Meitan xuebao Type: main |
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