Relaxation phenomena of electrical signal emissions from rock following application of abrupt mechanical stress

 
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2012 (EN)
Relaxation phenomena of electrical signal emissions from rock following application of abrupt mechanical stress (EN)

Σταύρακας, Ηλίας (EL)
Χλούπης, Γεώργιος Π. (EL)
Τριάντης, Δήμος Α. (EL)
Βαλλιανάτος, Φίλιππος (EL)

N/A (EN)

The emission of electrical signals during application of mechanical stress to brittle geo-materials (the so-called pressure-stimulated current; PSC) can provide significant information regarding the mechanical status of a studied rock sample. PSCs originate as a result of the opening of cracks and microfractures in rock. In this study, such electrical signal emissions are detected and studied when rock samples are subjected to step-wise mechanical stress, increased from low stress levels σ L up to higher stress levels σ H. This increase is performed at high stress rates and consequently the stress is maintained practically constant for a long period. During this time, the applied stress reaches its maximum value, and the emitted PSC decays gradually and relaxes back to a minimum value. The conducted experiments suggest that the characteristics of the relaxation processes of the PSC depend directly on the high level of the applied stress that is maintained constant after the application of each stress step. Analysis of the macroscopic parameters that characterize the relaxation phenomenon of the PSC provides clear information regarding the proximity of the applied stress to the fracture limit of the rock sample. (EN)

journalArticle

PSC (EN)
Rock fracture (EN)
Θραύση βράχου (EN)
Electric current relaxation phenomena (EN)
Φαινόμενα χαλάρωσης ηλεκτρικού ρεύματος (EN)
Αμφιβολίτες (EN)
mechanical stress (EN)
Amphibolite (EN)
Μηχανική καταπόνηση (EN)

ΤΕΙ Αθήνας (EL)
Technological Educational Institute of Athens (EN)

Annals of Geophysics (EN)

English

2012

DOI: 10.4401/ag-5316

Istituto Nazionale di Geofisica e Vulcanologia (IT)



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