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Rock Mechanics and Rock Engineering

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06.12.2023 | Original Paper

Micro-Fracturing in Granitic Rocks During Uniaxial Loading: The Role of Grain Size Heterogeneity

verfasst von: Matěj Petružálek, Z. Jechumtálová, T. Lokajíček, P. Kolář, J. Šílený

Erschienen in: Rock Mechanics and Rock Engineering | Ausgabe 3/2024

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Abstract

Laboratory loading experiments, in general, are used to estimate the mechanical properties of rocks. The application of acoustic emission (AE), a proxy for very small-scale earthquakes, offers insights into rock fracturing, especially when advanced seismological methods are applied. The uniaxial compressive test, the most conventional test within the scope of laboratory rock mechanics, estimates strength, elastic constants, or microcracking thresholds. Obviously, rock structure and grain size heterogeneity are the crucial parameters controlling these mechanical properties. Here, four granites with a different structure were uniaxially loaded, while AE was monitored, in order to observe the manner of fracturing. AE data were utilized at three different quality levels (AE recognition; AE localization; and the AE source mechanism). However, our focus was to study AE source mechanisms via the application of a shear-tensile crack source model. During a uniaxial compressive test, common (structurally independent) AE features led to the general characterization of microfracturing. On the other hand, sample related differences in AE results are discussed with respect to the role of granite heterogeneity. The comprehensiveness of the AE application demonstrated the validity of various levels of AE experiments.

Vorheriger Artikel Triaxial Deformation Rate Analysis (DRA)

Nächster Artikel Development of a Three-dimensional Stress Monitoring System for Coal Rock and its Application in a Mine

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Titel: Micro-Fracturing in Granitic Rocks During Uniaxial Loading: The Role of Grain Size Heterogeneity
verfasst von: Matěj Petružálek
Z. Jechumtálová
T. Lokajíček
P. Kolář
J. Šílený
Publikationsdatum: 06.12.2023
Verlag: Springer Vienna
Erschienen in: Rock Mechanics and Rock Engineering / Ausgabe 3/2024
Print ISSN: 0723-2632
Elektronische ISSN: 1434-453X
DOI: https://doi.org/10.1007/s00603-023-03668-7

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