Abstract
The purpose of the study was to compare stress values obtained from Acoustic Emission and Compact Conical-Ended Borehole Overcoring stress measurement techniques applied at an underground limestone mine in Japan, and to investigate the effect of rock anisotropy and confining pressure on the Kaiser Effect level which has been used to determine in situ stresses by the Acoustic Emission technique. Initially, Acoustic Emission tests were carried out on limestone cores extracted from horizontal boreholes in a pillar and hanging wall in the underground mine. The stress values obtained were two or three times greater than those obtained by the Compact Conical-Ended Borehole Overcoring method. In the second stage, the anisotropy of a granite block was determined by P-wave measurements. Core specimens extracted from two different directions were pre-loaded under axisymetric triaxial conditions by applying a series of differential stresses. The cores were then re-loaded under uniaxial conditions and the Kaiser Effect levels were determined. It was concluded that both the anisotropy and confining pressure have an important influence on the Kaiser Effect level.
Résumé
Le but de l’étude était de comparer les valeurs de contraintes obtenues à partir de la technique de mesure par Emission acoustique (AE) et une technique de Sur-carottage (CCBO), mises en œuvre dans une mine souterraine de calcaire au Japon. De plus, les effets de l’anisotropie de la roche et de la pression de confinement sur l’effet Kaiser défini dans les techniques d’émission acoustique ont été étudiés. Initialement les essais d’émission acoustique ont été réalisés sur des carottes de calcaire issues de forages horizontaux réalisés dans un pilier et une couche de toit de la mine souterraine. Les valeurs de contraintes obtenues étaient deux ou trois fois plus grandes que celles obtenues par la méthode de sur-carottage. Dans une deuxième étape, l’anisotropie d’un bloc de granite a été déterminée par des mesures de vitesses d’ondes P. Des échantillons carottés suivant deux directions différentes furent pré-chargés sous conditions triaxiales symétriques en appliquant différents niveaux de contraintes. Les échantillons furent re-chargés sous conditions uni-axiales et les valeurs d’effet Kaiser déterminées. On a conclu que l’anisotropie et la pression de confinement avaient tous deux une influence importante sur les valeurs d’effet Kaiser.
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Acknowledgments
The authors are grateful to Mr. T. Nakazono for his kind support during the laboratory studies.
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Tuncay, E., Obara, Y. Comparison of stresses obtained from Acoustic Emission and Compact Conical-Ended Borehole Overcoring techniques and an evaluation of the Kaiser Effect level. Bull Eng Geol Environ 71, 367–377 (2012). https://doi.org/10.1007/s10064-011-0362-y
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DOI: https://doi.org/10.1007/s10064-011-0362-y
Keywords
- Acoustic Emission (AE)
- Compact Conical-ended Borehole Overcoring (CCBO)
- Kaiser Effect (KE)
- Rock anisotropy
- Rock stress