Gas permeability of rocks and its use for monitoring crack propagation during compressive strength testing

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68145535%3A_____%2F25%3A00638254" target="_blank" >RIV/68145535:_____/25:00638254 - isvavai.cz</a>

Výsledek na webu

<a href="https://airdrive.eventsair.com/eventsairwesteuprod/production-atlanticmice-public/66d0368fd7e74c0684a9e53cafa78f4f" target="_blank" >https://airdrive.eventsair.com/eventsairwesteuprod/production-atlanticmice-public/66d0368fd7e74c0684a9e53cafa78f4f</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Gas permeability of rocks and its use for monitoring crack propagation during compressive strength testing

Popis výsledku v původním jazyce

The microstructure of pores in rocks includes the shape, size, volume distribution and connectivity of pores and cracks and has a significant influence on large number of properties such as the strength of the rock, its deformation and fracture behaviour. Together with the related rock permeability, it is the decisive factor in assessing the suitability of the rock host environment for demanding technical applications such as the geological disposal of high-level radioactive waste or carbon sequestration. The rock permeability therefore not only reflects the physical and petrographical properties of the rock material itself, but also depends on the intensity of the rock failure. The state of stress that leads to the closing of the pore system reduces the rock permeability. Conversely, the rock damage processes induced by continued loading cause the origin and development of cracks, which often very significantly increases the rock permeability. This close relationship between the permeability of the rock to fluids and the stress state, respectively the degree of failure of the rock material, thus means that the change in permeability coefficient values during loading can be used as a very sensitive indicator for measuring the progress of the failure process of test specimen. Five different types of rocks were used for observing the changes in gas permeability during compressive loading, including conglomerates, sandstones and migmatite. The permeability measurement equipment consists of a KTK 100 triaxial chamber adapted for the passage of gas. The ZWICK 1494 mechanical press was used as a source of axial stress. The measurements were carried out on cylindrical test specimens with a diameter of 48 mm and a height of 96 mm. It was found that an increase in gas permeability due to the formation of microcracks occurs when ca 70-90 % of the maximum loading force is applied.

Název v anglickém jazyce

Gas permeability of rocks and its use for monitoring crack propagation during compressive strength testing

Popis výsledku anglicky

The microstructure of pores in rocks includes the shape, size, volume distribution and connectivity of pores and cracks and has a significant influence on large number of properties such as the strength of the rock, its deformation and fracture behaviour. Together with the related rock permeability, it is the decisive factor in assessing the suitability of the rock host environment for demanding technical applications such as the geological disposal of high-level radioactive waste or carbon sequestration. The rock permeability therefore not only reflects the physical and petrographical properties of the rock material itself, but also depends on the intensity of the rock failure. The state of stress that leads to the closing of the pore system reduces the rock permeability. Conversely, the rock damage processes induced by continued loading cause the origin and development of cracks, which often very significantly increases the rock permeability. This close relationship between the permeability of the rock to fluids and the stress state, respectively the degree of failure of the rock material, thus means that the change in permeability coefficient values during loading can be used as a very sensitive indicator for measuring the progress of the failure process of test specimen. Five different types of rocks were used for observing the changes in gas permeability during compressive loading, including conglomerates, sandstones and migmatite. The permeability measurement equipment consists of a KTK 100 triaxial chamber adapted for the passage of gas. The ZWICK 1494 mechanical press was used as a source of axial stress. The measurements were carried out on cylindrical test specimens with a diameter of 48 mm and a height of 96 mm. It was found that an increase in gas permeability due to the formation of microcracks occurs when ca 70-90 % of the maximum loading force is applied.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20701 - Environmental and geological engineering, geotechnics

Projekt

<a href="/cs/project/GA23-05128S" target="_blank" >GA23-05128S: Vliv strukturních a texturních prvků na porušování transverzálně izotropních hornin zkoumaný pomocí 4D výpočetní tomografie</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název statě ve sborníku

ISRM International Symposium Eurock 2025

ISBN

978-82-8208-079-8

ISSN

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e-ISSN

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Počet stran výsledku

7

Strana od-do

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Název nakladatele

Norsk Betongforening

Místo vydání

Trondheim

Místo konání akce

Trondheim

Datum konání akce

16. 6. 2025

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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