On the spatio-temporal distribution of acoustic emissions in two granitic rocks under triaxial compression: the role of pre-existing cracks

Details On the spatio-temporal distribution of acoustic emissions in two granitic rocks under triaxial compression: the role of pre-existing cracks On the spatio-temporal distribution of acoustic emissions in two granitic rocks under triaxial compression: the role of pre-existing cracks

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.1997l&link_type=abstract

Geophysical Research Letters, Volume 27, Issue 13, p. 1997-2000

Physics

6

Physical Properties Of Rocks: Microstructure, Seismology, Seismology: Theory And Modeling

Scientific paper

We used a new rapid data acquisition system to examine the role of pre-existing crack density in determining the mechanical properties of crystalline rock. Two similar coarse-grained samples. Tsukuba granite (TG) and granitic porphyry (GP), were used in triaxial compression tests. The main difference between the two rocks is that TG contains main large pre-existing cracks, whereas GP is almost crack-free. In our tests, the two rocks showed significantly different behaviors. In GP, before the fault nucleation, AE activity was low and showed increasing b-values with increasing stress. But in TG, a large number of AEs were observed and showed short-term b-value anomalies-mutual fluctuations on a decreasing background. The short-term fluctuations of b-values are closely correlated with those of the spatio-temporal clustering of AE locations. Our results demonstrate: 1) pre-existing cracks are the most dominant factor of all heterogeneities that govern the fault nucleation process in laboratory rock samples; 2) failure predictability is dependent on the pre-existing crack density.

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