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Shear-tensile crack as a source model for laboratory acoustic emission
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SYSNO ASEP 0500588 Document Type C - Proceedings Paper (int. conf.) R&D Document Type O - Ostatní Title Shear-tensile crack as a source model for laboratory acoustic emission Author(s) Petružálek, Matěj (GLU-S) RID, SAI, ORCID
Lokajíček, Tomáš (GLU-S) RID, SAI, ORCID
Svitek, Tomáš (GLU-S) SAI, RID
Jechumtálová, Zuzana (GFU-E) ORCID, RID
Kolář, Petr (GFU-E) ORCID, RID
Adamová, Petra (GFU-E) ORCID, RID
Šílený, Jan (GFU-E) ORCID, RIDSource Title 52nd U.S. Rock Mechanics/Geomechanics Symposium. - s. l. : American Rock Mechanics Association, 2018 - ISBN N Number of pages 10 s. Publication form Print - P Action US Rock Mechanics/Geomechanics Symposium /52./ Event date 17.06.2018 - 20.06.2018 VEvent location Seattle Country US - United States Event type WRD Language eng - English Country US - United States Keywords compression testing ; compressive strength ; cracks ; inverse problems ; rock mechanics ; acoustic emission testing Subject RIV DB - Geology ; Mineralogy OECD category Geology Subject RIV - cooperation Geophysical Institute - Geology ; Mineralogy R&D Projects GA16-03950S GA ČR - Czech Science Foundation (CSF) GA18-08826S GA ČR - Czech Science Foundation (CSF) Institutional support GLU-S - RVO:67985831 ; GFU-E - RVO:67985530 EID SCOPUS 85053461302 Annotation Here, a shear-tensile crack (STC) model is presented as suitable for Acoustic Emission (AE) events and compared to a traditional MT (Moment Tensor) approach. Experimental data was obtained from a uniaxial compression test performed on a Westerly Granite (WG) specimen using a 14 channel AE monitoring system. The STC is a physical source, which describes anticipated fracture modes: Shear-slip and opening/closing tensile crack. It is described by fewer parameters (5 instead of the 6 for MT), which is essential for solving the inverse problem. The presented STC procedure was tested on 38 AE events selected over a range of 50 – 98% for the uniaxial compressive strength. As compared to the MT, the STC model displayed a similar fit for input data while providing far smaller confidence regions. The results indicate a more certain determination for the mechanism orientation and improved reliability for the decomposition components. In addition, use of STC model allowed better distinction between tension and shear type for AE events, which may be a crucial for recognizing an approaching failure. For our experiment, application of the STC model proved to be useful for recognizing the threshold of unstable microcracking. Workplace Institute of Geology Contact Jana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272 Year of Publishing 2019
Number of the records: 1