Westerly Granite Study of Physical and Transport Properties Monitored by P and S Waves on Spherical Samples: Effect of Temperature and Hydrostatic Pressure

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985831%3A_____%2F24%3A00619416" target="_blank" >RIV/67985831:_____/24:00619416 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/67985891:_____/24:00619416

Výsledek na webu

<a href="https://doi.org/10.56952/ARMA-2024-0553" target="_blank" >https://doi.org/10.56952/ARMA-2024-0553</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.56952/ARMA-2024-0553" target="_blank" >10.56952/ARMA-2024-0553</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Westerly Granite Study of Physical and Transport Properties Monitored by P and S Waves on Spherical Samples: Effect of Temperature and Hydrostatic Pressure

Popis výsledku v původním jazyce

We investigate the thermal damage of Westerly granite (WG) using ultrasonic methods, mercury intrusion porosimetry, and micrographic observations. WG is of interest due to its relatively high strength and low permeability in intact conditions. Our study focuses on the impact of pressure and temperature on simultaneous heating of two spherical specimens to mitigate the effects of heterogeneity. The spheres were heated to temperatures of 100°C, 200°C, 350°C, 500°C, 650°C, and 800°C. One sphere was designated for a comparative study to measure changes in weight and size, while the second sphere underwent measurements of both P and S wave velocities in 132 independent directions under hydrostatic pressures ranging from 0.1 to 120 MPa at six different values of acting pressure. The data obtained enables us to calculate the full stiffness tensor of WG without presumptions and invert it to derive all elastic parameters in the principal material directions. Additionally, the specific shape of the specimen facilitates easy measurement of porosity, strain, and bulk modulus of WG, allowing us to investigate the isotropic orientation and uniformity of microcracks throughout the specimen's volume. We will compare these findings with results from common methods such as mercury intrusion porosimetry, thin section analysis, and P and S wave measurements. Furthermore, we will discuss the appropriateness of using thermal stressing to induce isotropic microcracking in the specimen. We will present the 3D dependencies of P and S wave velocities, along with their corresponding elastic constants determined in principal materials directions such as Young's modulus, shear modulus, and Poisson's ratio, as functions of temperature and pressure

Název v anglickém jazyce

Westerly Granite Study of Physical and Transport Properties Monitored by P and S Waves on Spherical Samples: Effect of Temperature and Hydrostatic Pressure

Popis výsledku anglicky

We investigate the thermal damage of Westerly granite (WG) using ultrasonic methods, mercury intrusion porosimetry, and micrographic observations. WG is of interest due to its relatively high strength and low permeability in intact conditions. Our study focuses on the impact of pressure and temperature on simultaneous heating of two spherical specimens to mitigate the effects of heterogeneity. The spheres were heated to temperatures of 100°C, 200°C, 350°C, 500°C, 650°C, and 800°C. One sphere was designated for a comparative study to measure changes in weight and size, while the second sphere underwent measurements of both P and S wave velocities in 132 independent directions under hydrostatic pressures ranging from 0.1 to 120 MPa at six different values of acting pressure. The data obtained enables us to calculate the full stiffness tensor of WG without presumptions and invert it to derive all elastic parameters in the principal material directions. Additionally, the specific shape of the specimen facilitates easy measurement of porosity, strain, and bulk modulus of WG, allowing us to investigate the isotropic orientation and uniformity of microcracks throughout the specimen's volume. We will compare these findings with results from common methods such as mercury intrusion porosimetry, thin section analysis, and P and S wave measurements. Furthermore, we will discuss the appropriateness of using thermal stressing to induce isotropic microcracking in the specimen. We will present the 3D dependencies of P and S wave velocities, along with their corresponding elastic constants determined in principal materials directions such as Young's modulus, shear modulus, and Poisson's ratio, as functions of temperature and pressure

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

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

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název statě ve sborníku

58th U.S. Rock Mechanics/Geomechanics Symposium. Proceeding papers.

ISBN

978-0-9794975-9-9

ISSN

—

e-ISSN

—

Počet stran výsledku

8

Strana od-do

2024-0553

Název nakladatele

American Rock Mechanics Association

Místo vydání

Atlanta, Georgia

Místo konání akce

Colorado

Datum konání akce

23. 6. 2024

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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