Microhardness of coal from near-fault zones in coal seams threatened with gas-geodynamic phenomena, upper Silesian Coal Basin, Poland

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68145535%3A_____%2F19%3A00510629" target="_blank" >RIV/68145535:_____/19:00510629 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.mdpi.com/1996-1073/12/9/1756" target="_blank" >https://www.mdpi.com/1996-1073/12/9/1756</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/en12091756" target="_blank" >10.3390/en12091756</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Microhardness of coal from near-fault zones in coal seams threatened with gas-geodynamic phenomena, upper Silesian Coal Basin, Poland

Popis výsledku v původním jazyce

Near-fault coal displays some specific structural and textural features. As the distance to the fault diminishes, one can observe ever stronger, gradual degradation of coal, demonstrated by the emergence of structural distortions exogenic in their origin, visible under a microscope. The process of gradual degradation of coal - manifested by the appearance of structural distortions exogenic in their origin - takes place. This can be observed under a microscope. The measurements of the microhardness of structurally altered coal carried out using the Vickers hardness test. For the purpose of this research, a microhardness tester by the CSM Instruments was used. The microhardness of particular structural types of coal was measured. The procedure encompassed both structurally unaltered and altered coal. The tested objects were exogenically fractured fragments, cataclastic, and mylonitic structures. Each of the analyzed structural types displayed a different range of the microhardness, with the highest values confirmed for the structurally unaltered coal. In the case of fractured coal, the microhardness values were somewhat lower. Finally, the lowest values were ascertained for cataclastic coal. Mylonitic coal, in turn, displayed microhardness values similar to those found in the unaltered coal. It was also observed that, in the case of the unaltered, fractured, and cataclastic coal, cracks propagated in the manner typical of brittle materials, whereas the mylonitic coal revealed some degree of elasticity. The analyzed microhardness parameters expose the structural-textural features of coal, particularly when it comes to the degree and character of destruction of the rock's original matrix. The specific structural-textural composition of particular types of near-fault creations influences both their sorption parameters and the compactness of coal in a seam.

Název v anglickém jazyce

Microhardness of coal from near-fault zones in coal seams threatened with gas-geodynamic phenomena, upper Silesian Coal Basin, Poland

Popis výsledku anglicky

Near-fault coal displays some specific structural and textural features. As the distance to the fault diminishes, one can observe ever stronger, gradual degradation of coal, demonstrated by the emergence of structural distortions exogenic in their origin, visible under a microscope. The process of gradual degradation of coal - manifested by the appearance of structural distortions exogenic in their origin - takes place. This can be observed under a microscope. The measurements of the microhardness of structurally altered coal carried out using the Vickers hardness test. For the purpose of this research, a microhardness tester by the CSM Instruments was used. The microhardness of particular structural types of coal was measured. The procedure encompassed both structurally unaltered and altered coal. The tested objects were exogenically fractured fragments, cataclastic, and mylonitic structures. Each of the analyzed structural types displayed a different range of the microhardness, with the highest values confirmed for the structurally unaltered coal. In the case of fractured coal, the microhardness values were somewhat lower. Finally, the lowest values were ascertained for cataclastic coal. Mylonitic coal, in turn, displayed microhardness values similar to those found in the unaltered coal. It was also observed that, in the case of the unaltered, fractured, and cataclastic coal, cracks propagated in the manner typical of brittle materials, whereas the mylonitic coal revealed some degree of elasticity. The analyzed microhardness parameters expose the structural-textural features of coal, particularly when it comes to the degree and character of destruction of the rock's original matrix. The specific structural-textural composition of particular types of near-fault creations influences both their sorption parameters and the compactness of coal in a seam.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10504 - Mineralogy

Projekt

<a href="/cs/project/LO1406" target="_blank" >LO1406: Institut čistých technologií těžby a užití energetických surovin - Projekt udržitelnosti</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Energies

ISSN

1996-1073

e-ISSN

—

Svazek periodika

12

Číslo periodika v rámci svazku

9

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

15

Strana od-do

1756

Kód UT WoS článku

000469761700172

EID výsledku v databázi Scopus

2-s2.0-85066033345