Laser–-ultrasonic spectroscopy of the pechora basin coal microstructure

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F19%3A00334795" target="_blank" >RIV/68407700:21110/19:00334795 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.25018/0236-1493-2019-06-0-56-65" target="_blank" >https://doi.org/10.25018/0236-1493-2019-06-0-56-65</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.25018/0236-1493-2019-06-0-56-65" target="_blank" >10.25018/0236-1493-2019-06-0-56-65</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Laser–-ultrasonic spectroscopy of the pechora basin coal microstructure

Popis výsledku v původním jazyce

Samples of the Pechora basin coal are tested with the pre-determined uniaxial compression strength in the normal direction to bedding. The test data show that different samples have close values of the uniaxial compression strength. The laser-ultrasonic spectroscopy in the mode of automatic scanning of coal sample surface at a pitch of 1 mm visualizes the internal structure of coal. It is found that in the vertical sections of the samples, cracks are mostly horizontal in conformity with the direction of bedding. The geometrical dimension and depth of cracks are determined. Based on the precision measurements of P- and S-wave velocities, the local values of Young's modulus and Poisson's ratio are for the first time obtained for coal accurate to 1 and 5%, respectively. The presence of cracks from 0.5 to 3 mm long with an opening of 80-200 |j.m results in dispersion of Young's modulus and Poisson's ratio in the ranges from 6.81 to 7.25 GPa and from 0.23 to 0.29. By the calculated values, the map of Young's modulus distribution over sample surface is plotted.

Název v anglickém jazyce

Laser–-ultrasonic spectroscopy of the pechora basin coal microstructure

Popis výsledku anglicky

Samples of the Pechora basin coal are tested with the pre-determined uniaxial compression strength in the normal direction to bedding. The test data show that different samples have close values of the uniaxial compression strength. The laser-ultrasonic spectroscopy in the mode of automatic scanning of coal sample surface at a pitch of 1 mm visualizes the internal structure of coal. It is found that in the vertical sections of the samples, cracks are mostly horizontal in conformity with the direction of bedding. The geometrical dimension and depth of cracks are determined. Based on the precision measurements of P- and S-wave velocities, the local values of Young's modulus and Poisson's ratio are for the first time obtained for coal accurate to 1 and 5%, respectively. The presence of cracks from 0.5 to 3 mm long with an opening of 80-200 |j.m results in dispersion of Young's modulus and Poisson's ratio in the ranges from 6.81 to 7.25 GPa and from 0.23 to 0.29. By the calculated values, the map of Young's modulus distribution over sample surface is plotted.

Druh

J_SC - Článek v periodiku v databázi SCOPUS

CEP obor

—

OECD FORD obor

20101 - Civil engineering

Projekt

<a href="/cs/project/EF16_027%2F0008465" target="_blank" >EF16_027/0008465: Mezinárodní mobility výzkumných pracovníků ČVUT</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

Mining Informational and Analytical Bulletin

ISSN

0236-1493

e-ISSN

—

Svazek periodika

6

Číslo periodika v rámci svazku

June

Stát vydavatele periodika

RU - Ruská federace

Počet stran výsledku

10

Strana od-do

56-65

Kód UT WoS článku

—

EID výsledku v databázi Scopus

2-s2.0-85070831383