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

Result code in 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>

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10504 - Mineralogy

Project

<a href="/en/project/LO1406" target="_blank" >LO1406: Institute of clean technologies for mining and utilization of raw materials for energy use -Sustainability program</a><br>

Continuities

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

Publication year

2019

Confidentiality

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

Name of the periodical

Energies

ISSN

1996-1073

e-ISSN

—

Volume of the periodical

12

Issue of the periodical within the volume

9

Country of publishing house

CH - SWITZERLAND

Number of pages

15

Pages from-to

1756

UT code for WoS article

000469761700172

EID of the result in the Scopus database

2-s2.0-85066033345