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Analysis of the internal structure of Brenna sandstone samples with respect to the differences in measured quasi‑elastic moduli
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SYSNO ASEP 0585109 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Ostatní články Title Analysis of the internal structure of Brenna sandstone samples with respect to the differences in measured quasi‑elastic moduli Author(s) Janeček, Ivan (UGN-S) RID
Mishra, Deepak Amban (UGN-S)
Vishnu, C. S. (UGN-S)
Souček, Kamil (UGN-S) RID, ORCID
Hlaváček, Petr (UGN-S) RID, ORCID
Klichová, Dagmar (UGN-S) RID, ORCID
Martinec, Petr (UGN-S) RIDNumber of authors 7 Source Title Rock Mechanics and Rock Engineering. - : Springer - ISSN 0723-2632
(2024)Number of pages 22 s. Publication form Online - E Language eng - English Country DE - Germany Keywords rock structure ; rock mechanics ; triaxial-stress state ; stratification ; sedimentary rocks ; sandstone ; water jet ; X-ray CT Subject RIV BM - Solid Matter Physics ; Magnetism OECD category Condensed matter physics (including formerly solid state physics, supercond.) R&D Projects LO1406 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) LM2015084 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) GA23-05128S GA ČR - Czech Science Foundation (CSF) GA23-07415S GA ČR - Czech Science Foundation (CSF) Method of publishing Open access Institutional support UGN-S - RVO:68145535 DOI 10.1007/s00603-024-03828-3 Annotation 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.
Workplace Institute of Geonics Contact Lucie Gurková, lucie.gurkova@ugn.cas.cz, Tel.: 596 979 354 Year of Publishing 2025 Electronic address https://link.springer.com/article/10.1007/s00603-024-03828-3
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