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Titolo:
Comparison of the microfracture localization in granite between fracturation and slip of a preexisting macroscopic healed joint by acoustic emission measurements
Autore:
Jouniaux, L; Masuda, K; Lei, XL; Nishizawa, O; Kusunose, K; Liu, LQ; Ma, WT;
Indirizzi:
Ecole Normale Super, Geol Lab, UMR 8538, F-75231 Paris 05, France Ecole Normale Super Paris France 05 , UMR 8538, F-75231 Paris 05, France Geol Survey Japan, Tsukuba, Ibaraki 305, Japan Geol Survey Japan Tsukuba Ibaraki Japan 305 , Tsukuba, Ibaraki 305, Japan China Seismol Bur, Beijing, Peoples R China China Seismol Bur Beijing Peoples R China Bur, Beijing, Peoples R China
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
fascicolo: B5, volume: 106, anno: 2001,
pagine: 8687 - 8698
SICI:
0148-0227(20010510)106:B5<8687:COTMLI>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
STATIC FAULT GROWTH; WESTERLY GRANITE; BRITTLE SOLIDS; ROCK; COMPRESSION; FAILURE; DAMAGE; MICROMECHANICS; NUCLEATION; SANDSTONE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
48
Recensione:
Indirizzi per estratti:
Indirizzo: Jouniaux, L Ecole Normale Super, Geol Lab, UMR 8538, F-75231 Paris 05, France Ecole Normale Super Paris France 05 F-75231 Paris 05, France
Citazione:
L. Jouniaux et al., "Comparison of the microfracture localization in granite between fracturation and slip of a preexisting macroscopic healed joint by acoustic emission measurements", J GEO R-SOL, 106(B5), 2001, pp. 8687-8698

Abstract

Experiments of fracturation and slip of a preexisting macroscopic healed joint have been performed under triaxial deformation on granite from Mayet de Montagne (France). This granite shows high grain-scale inhomogeneity. Acoustic emissions have been recorded and hypocenters have been determined during the entire experiments. For both rupture experiment and slip experiment, precursory localization of microfractures in the final rupture plane has been observed in the early stage of deformation, well before the dilatancy. It is likely that not only initial closure of favorably oriented cracks but also breaking of partially cemented grains or slipping between grains mayoccur in the pseudoelastic phase and are already localized on the final rupture plane where the shear stress seems to be concentrate. This behavior is observed in both cases where stress heterogeneity and rupture nucleation are controlled by (1) medium-scale heterogeneity at the grain scale (HS sample) or (2) macroscopic heterogeneity in the form of a preexisting healed joint (JS sample). The sample with the healed joint exhibited similar to 1.6times more acoustic emission events than the intact sample. The presence of the healed joint significantly weakened the sample.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/09/20 alle ore 09:30:00