Experimental Pilot Thermomechanical Study of Lower Carboniferous Greywacke: Temperature Effect on the Rock Mass Properties Investigated up to 1,200°C

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26110%2F24%3APU152037" target="_blank" >RIV/00216305:26110/24:PU152037 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/67985831:_____/24:00597987

Výsledek na webu

<a href="https://doi.org/10.1520/JTE20240003" target="_blank" >https://doi.org/10.1520/JTE20240003</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1520/JTE20240003" target="_blank" >10.1520/JTE20240003</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Experimental Pilot Thermomechanical Study of Lower Carboniferous Greywacke: Temperature Effect on the Rock Mass Properties Investigated up to 1,200°C

Popis výsledku v původním jazyce

Greywacke, i.e., a non- to anchi-metamorphosed immature sandstone that contains more than 15 % clay minerals, occurs in most orogenic belts, with depositional ages ranging from Precambrian to recent. Our study focuses on thermomechanical rock properties of greywacke sampled in Koberice rice quarry (Lower Carboniferous Culm Basin, Drahany Upland, Bohemian Massif). Both relatively fine-grained and coarse-grained (with higher abundance of lithic fragments and small pebbles) intact rock core samples were tested. The experiment was divided into two sets. The first set made of the coarse-grained greywacke gave insight into the changes of properties across the whole temperature range, up to 1,200 degrees C. The second set of samples was used to study the behavior of the fine-grained greywacke in the lower temperature range, up to 400 degrees C. The lower temperature analysis showed an unexpected phenomenon at 200 degrees C to 300 degrees C, manifested by decrease in the strength coupled with higher values of deformation characteristics. These trends reverted at 400 degrees C. The described phenomenon may have been caused by changes in water content combined with clay minerals composition alternation. Alternatively, it could be also related to the rock "paleotemperature memory." " On the wider temperature range, the greywacke holds relatively well to the lower temperatures, with the strengths decreasing slowly after 400 degrees C and more rapidly after 800 degrees C. At 1,200 degrees C, partial melting at grain boundaries accompanied by formation of larger pores in the sample center was observed. Results of thermomechanical studies can be crucial during the design of underground constructions or for assessment of the fire damage on a rock-based constructions.

Název v anglickém jazyce

Experimental Pilot Thermomechanical Study of Lower Carboniferous Greywacke: Temperature Effect on the Rock Mass Properties Investigated up to 1,200°C

Popis výsledku anglicky

Greywacke, i.e., a non- to anchi-metamorphosed immature sandstone that contains more than 15 % clay minerals, occurs in most orogenic belts, with depositional ages ranging from Precambrian to recent. Our study focuses on thermomechanical rock properties of greywacke sampled in Koberice rice quarry (Lower Carboniferous Culm Basin, Drahany Upland, Bohemian Massif). Both relatively fine-grained and coarse-grained (with higher abundance of lithic fragments and small pebbles) intact rock core samples were tested. The experiment was divided into two sets. The first set made of the coarse-grained greywacke gave insight into the changes of properties across the whole temperature range, up to 1,200 degrees C. The second set of samples was used to study the behavior of the fine-grained greywacke in the lower temperature range, up to 400 degrees C. The lower temperature analysis showed an unexpected phenomenon at 200 degrees C to 300 degrees C, manifested by decrease in the strength coupled with higher values of deformation characteristics. These trends reverted at 400 degrees C. The described phenomenon may have been caused by changes in water content combined with clay minerals composition alternation. Alternatively, it could be also related to the rock "paleotemperature memory." " On the wider temperature range, the greywacke holds relatively well to the lower temperatures, with the strengths decreasing slowly after 400 degrees C and more rapidly after 800 degrees C. At 1,200 degrees C, partial melting at grain boundaries accompanied by formation of larger pores in the sample center was observed. Results of thermomechanical studies can be crucial during the design of underground constructions or for assessment of the fire damage on a rock-based constructions.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název periodika

JOURNAL OF TESTING AND EVALUATION

ISSN

0090-3973

e-ISSN

1945-7553

Svazek periodika

52

Číslo periodika v rámci svazku

5

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

15

Strana od-do

„“-„“

Kód UT WoS článku

001281075900001

EID výsledku v databázi Scopus

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