Analysis of the internal structure of Brenna sandstone samples with respect to the differences in measured quasi‑elastic moduli

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68145535%3A_____%2F24%3A00585109" target="_blank" >RIV/68145535:_____/24:00585109 - isvavai.cz</a>

Result on the web

<a href="https://link.springer.com/article/10.1007/s00603-024-03828-3" target="_blank" >https://link.springer.com/article/10.1007/s00603-024-03828-3</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s00603-024-03828-3" target="_blank" >10.1007/s00603-024-03828-3</a>

Result language

angličtina

Original language name

Analysis of the internal structure of Brenna sandstone samples with respect to the differences in measured quasi‑elastic moduli

Original language description

The Young’s modulus and Poisson’s ratio determined for the rocks under uniaxial or triaxial loading conditions represent necessary input parameters for solving many geotechnical tasks. However, these effective stiffness moduli, particularly the Poisson’s ratios, measured on different samples sometimes substantially differ, even for visually compact and macroscopically homogeneous rock. This has been observed for Brenna sandstone, especially under conditions of conventional triaxial extensions. The aim of this study was, thus, to reveal differences in rock structure that could cause such behavior. Several complementary methods were used to investigate the structure of this sandstone: X-ray computed tomography (CT), visual analysis using optical scanning and stereo-microscopy, and a new method combining water jet erosion with these visualization techniques. Analyses of this structure revealed mechanically more resistant compact thick and adjacent thin weak layers. In rock samples, these layers have different patterns and orientations. To demonstrate the influence of layer orientation on effective stiffness moduli measured under different loading conditions, FEM calculations were performed for idealized structural models. The outcomes of this numerical analysis are in qualitative agreement with the results of the loading experiments and the layered structure revealed in the samples. The ability of the proposed method using water erosion to analyze the rock structure in detail was verified. The method offers an interesting alternative to standard visual and X-ray CT techniques. The numerical calculations indicate the importance of latent layered defects in sedimentary rocks for fine measurements of stiffness moduli (especially the Poisson’s ratios) used as inputs for geotechnical applications.n

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2024

Confidentiality

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

Name of the periodical

Rock Mechanics and Rock Engineering

ISSN

0723-2632

e-ISSN

1434-453X

Volume of the periodical

57

Issue of the periodical within the volume

8

Country of publishing house

DE - GERMANY

Number of pages

22

Pages from-to

5913-5934

UT code for WoS article

001198584400003

EID of the result in the Scopus database

2-s2.0-85189624583