Elastic anisotropy, permeability, and freeze-thaw cycling of rapakivi granite

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985831%3A_____%2F20%3A00534573" target="_blank" >RIV/67985831:_____/20:00534573 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S1365160920309072" target="_blank" >https://www.sciencedirect.com/science/article/pii/S1365160920309072</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.ijrmms.2020.104541" target="_blank" >10.1016/j.ijrmms.2020.104541</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Elastic anisotropy, permeability, and freeze-thaw cycling of rapakivi granite

Popis výsledku v původním jazyce

Due to the ice-water transition, frost weathering in cold regions has always been in focus as a rock deterioration mechanism. Internal stresses, developed by this process, conduce to progressive fracturing and consequent changes in rock properties, particularly, elastic velocities. Previous research was mainly focused on isotropic properties of rocks. However, we have found that elastic anisotropy is substantially enhanced by frost weathering. A series of freeze-thaw tests were performed on weathered rapakivi granite fully saturated by water. The experimental basis involved: a neutron diffraction study of texture, measurements of the 3D distributions of ultrasonic P-wave velocities, and permeability at atmospheric and high confining pressures. Experimental data, along with texture-based effective media modeling of rock elastic properties, revealed the anisotropic response of elastic velocities to freeze-thaw cycling, which is related to the volume increase of specifically oriented cracks. Through permeability measurements, these oriented cracks were determined to be hydraulically interconnected and also responsible for observed frost weathering deterioration. Both ultrasonic and permeability experiments suggested a decrease in the crack closing pressure due to freeze thaw cycling.

Název v anglickém jazyce

Elastic anisotropy, permeability, and freeze-thaw cycling of rapakivi granite

Popis výsledku anglicky

Due to the ice-water transition, frost weathering in cold regions has always been in focus as a rock deterioration mechanism. Internal stresses, developed by this process, conduce to progressive fracturing and consequent changes in rock properties, particularly, elastic velocities. Previous research was mainly focused on isotropic properties of rocks. However, we have found that elastic anisotropy is substantially enhanced by frost weathering. A series of freeze-thaw tests were performed on weathered rapakivi granite fully saturated by water. The experimental basis involved: a neutron diffraction study of texture, measurements of the 3D distributions of ultrasonic P-wave velocities, and permeability at atmospheric and high confining pressures. Experimental data, along with texture-based effective media modeling of rock elastic properties, revealed the anisotropic response of elastic velocities to freeze-thaw cycling, which is related to the volume increase of specifically oriented cracks. Through permeability measurements, these oriented cracks were determined to be hydraulically interconnected and also responsible for observed frost weathering deterioration. Both ultrasonic and permeability experiments suggested a decrease in the crack closing pressure due to freeze thaw cycling.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20701 - Environmental and geological engineering, geotechnics

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název periodika

International Journal of Rock Mechanics and Mining Sciences

ISSN

1365-1609

e-ISSN

—

Svazek periodika

136

Číslo periodika v rámci svazku

December

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

9

Strana od-do

104541

Kód UT WoS článku

000599913300002

EID výsledku v databázi Scopus

2-s2.0-85095442798