Počet záznamů: 1

Fracturing of migmatite monitored by acoustic emission and ultrasonic sounding

SYSNO ASEP	0473251
Druh ASEP	C - Konferenční příspěvek (mezinárodní konf.)
Zařazení RIV	D - Článek ve sborníku
Název	Fracturing of migmatite monitored by acoustic emission and ultrasonic sounding
Tvůrce(i)	Petružálek, Matěj (GLU-S)_{RID, SAI, ORCID} Lokajíček, Tomáš (GLU-S)_{RID, SAI, ORCID} Svitek, Tomáš (GLU-S)_{SAI, RID}
Zdroj.dok.	50th US Rock Mechanics / Geomechanics Symposium 2016, 3. - Houston : American Rock Mechanics Association (ARMA), 2016 - ISBN 978-151082802-5
Rozsah stran	s. 803-810
Poč.str.	8 s.
Forma vydání	Tištěná - P
Akce	US Rock Mechanics / Geomechanics Symposium /50./
Datum konání	26.06.2016 - 29.06.2016
Místo konání	Houston
Země	US - Spojené státy americké
Typ akce	WRD
Jazyk dok.	eng - angličtina
Země vyd.	US - Spojené státy americké
Klíč. slova	anisotropy ; elastic moduli ; rock mechanics ; rocks ; shearing
Vědní obor RIV	DC - Seismologie, vulkanologie a struktura Země
Obor OECD	Environmental and geological engineering, geotechnics
Institucionální podpora	GLU-S - RVO:67985831
EID SCOPUS	85010426715
Anotace	Migmatite from the Skalka region (Czech Republic) was chosen as an experimental rock material. It has a macroscopically visible plane-parallel structure (foliation). The foliation was caused mainly by biotite grain arrangement. Four cylindrical specimens of migmatite with sub-horizontal, sub-vertical and oblique foliation were uniaxially loaded up to failure. A network of 8 broadband sensors was employed for acoustic emission monitoring and ultrasonic sounding. A grid search method with an anisotropic velocity model was used for AE hypocenter localization. The source types of successfully localized events were determined from the average first arrival amplitude. Structural anisotropy of the tested rock material caused the anisotropy of its mechanical properties (peak strength, Young's modulus) as well as a different fracturing in dependence on the angle between the axial stress and the foliation plane. The combination of tension and shear microcracking together with sliding in biotite basal planes was found to control the failure of specimens with sub-horizontal foliation. Shearing and sliding were dominant in the failure of specimens with oblique foliation. With greater dip of foliation, the role of sliding increased at the expense of shearing. Due to the favorably oriented system of microcracks already present, the shearing and splitting was at the same level during fracturing of specimens with sub-vertical foliation before nucleation began.
Pracoviště	Geologický ústav
Kontakt	Jana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272
Rok sběru	2017

Počet záznamů: 1