Ultrasonic characteristics of a rock mass

McKenzie, C.K.; Stacey, G.P.; Gladwin, M. T.

doi:10.1016/0148-9062(82)90707-0

Cited by 23 publications

(10 citation statements)

References 12 publications

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“…Pau1sson and King [6] studied the changes in cross-hole compressional and shear-wave velocities resulting from thermal cycling in a granitic rock mass. McKenzie et a1 [7] and Gladwin [8] employed cross-hole ultrasonic measurements to characterize the degree of fracturing in a rock mass, and to monitor stress changes in the pillars of underground mines. Recently, Wong et a1 [9] have reported acoustic crosshole measurements in crystalline rocks, that were used to infer changes in lithology and to trace fracture zones between boreholes.…”

Section: Introductionmentioning

confidence: 99%

Cross-hole acoustic surveying in basalt

Rezowalli

King

Myer

1984

International Journal of Rock Mechanics and Mining Sciences &am

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Section: Introductionmentioning

confidence: 99%

Cross-hole acoustic surveying in basalt

Rezowalli

King

Myer

1984

International Journal of Rock Mechanics and Mining Sciences &am

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“…Grainger and McCann (1977) provided two case histories of cross-hole acoustic measurements for site investigations in rock masses. McCann and Barie (1982) described crosa-hole acoustic measureme.-us applied in assessing the quality of a granitic rock mass for radioactive waste storage…”

Section: Introductionmentioning

confidence: 99%

“…McKenzie et al (1982) reported a research program aimed at the Jji situ assessment of rock properties and quality at a number of Australian mine sites, employing a cross-hole acoustic system to obtain compressional-wave velocity and attenuation. Gladwin (1982) used the same system described by McKenzie ez_ aj L to monitor stress changes in an underground support pillar in a copper mine.…”

Section: Introductionmentioning

confidence: 99%

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Seismic velocities and attenuation in an underground granitic waste repository subjected to heating

Paulsson¹,

T²

1984

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The behavior of a granitic rock, mass subjected to thermal load has been studied by an acoustic cross-hole technique between four boreholes, over a period of some two years. Velocities between boreholes were obtained from the tlmes-of-flight of pulses of acoustic waves between transducers damped to the borehole wall. The attenuation was obtained by a spectral ratios technique. When the heater waa turned on, the velocities increased rapidly to an asymptotic value. When the heater was turned off, the velocities decreased rapidly to their original values or below. Velocities along a particular profile were found to Increase linearly with the mean temperature in the profile tested. The attenuation showed little correlation with changes in temperature or the aaaociated thernmal stresses, but there was a good correlation of attenuation with water content and the related changes in pore pressure.Nous avons etudle le comportement d'une masse de granite soumiae a une charge thermique a I 1 aide d'une technique acoustique. Les mesurea etaient faites entre quaere trous de forage pendant une perlode de deux annees. Nous obtinmes les velocites par la meaure du temps de paseage d'une impul sion acoustique, l'attenuation etalt calculee par la technique dea rapports des spectres. Lea velocites augmentaient rapidement au commencement du chauffage, atteignant bientot leur valeura aasynptotiques. A l 1 arret du chauffage les velocites sont revenues tree vite a leur valeur d'orlgine. Les velocites lelong d'un profil donne demontfent une variation line at re avec la tempera ture aoyenne du profil. L'attenuation ne semble pas etre rellee aux changementa de temperature Ou de la charge thermique. Cependent on note une bonne correlation entre 1'attenuation et le content! en eau de la roche.Daa Verhalten elner granltiBchen Cestelnsmasse bei Aufheizung 1st mit Hllfe akustischer Transmis sion zwlschen vler Bohrloechern ueber elnen Zeitraum von ueber zwel Jahren untersucht worden. Schallgeschwindigkeiten zwlschen Bohrloechern wurden aus der Ankunftszelt von akustischen Pulsen in an der flohrlochwand angebrachten Mlkrofonen ermittelt. Die Abechwaechung wurde mit einer Hethode spektraler Intensitaetsverhaeltnlsse ermittelt. Nach Anschalttm der Heizgeraete wurde eln schneller Geschwlndlgkeitsanstieg zu einen asymptotlschen Wert beobachtet. Nach Abachalten der Heizung fielen die Geschwlndigkeiten schnell auf lhren urspruenglichen Wert Oder darunter. Geschwindigkeiten In elner besclmmten vertikalen Ebene nahmen In linearer Abhaengigkcit mit der mlttleren Teraperatur zu. Die Abachwaechung war kaun mit Temperaturaenderungen und den d«mit verbundenen thermischen Spannungen korrellert, aber Abechwaechung zeigte eine gute Korrelation mit Uassergehalt und den daalt zusanaenhaengendeo Aenderungen lm Wasserdruck in den Gestelnsporen.

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“…Paulsson and King (1980) studied the changes in cross-hole compressional and shear-wave velocities resulting from thermal cycling in a granitic rock mass. McKenzie et al (1982) and Gladwin (1982) employed cross-hole ultrasonic measurements to characterize the degree of fracturing in a rock mass, and to monitor stress changes in the pillars of underground mines. McCann and Baria (1982) described cross-hole acoustic measurements applied in assessing the quality of a granitic rock mass for radioactive waste storage.…”

Section: Introductionmentioning

confidence: 99%

Cross-hole acoustic measurements in basalt

Myer

Rezowalli

1986

International Journal of Rock Mechanics and Mining Sciences &am

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A series of cross-hole acoustic measurements have been performed in a columnar-jointed basaltic rock mass around an underground opening mined by the drill-and-blast method. The purposes of the test program were: to evaluate the rock mass characteristics around the opening; to determine the zone of blast damage; and to evaluate seismic methods for anomaly detection ahead of mining in this type of rock. The cross-hole measurements were made between four 76-mm diameter horizontal boreholes diamond-drilled 12 m into a wall of the underground opening. Repetitive pulses of compressional (P) and shear (S) waves of frequencies in the range 1 kHz-100 kHz were propagated from a transmitter sonde through the rock mass to a receiver sonde, both of which w~re clamped hydraulically to the borehole wall. After amplification the received P-and S-wave signals were digitized at the surface by a digital oscilloscope and stored on floppy discs.The results indicate considerable reductions in P-and S-wave velocities at distances less than 2 m from the face. Clearly these low values are associated with blast damage. Beyond 2 m, the velocities in a vertical direction indicate almost constant values. The velocities in the horizontal direction beyond 2m appeared erratic, but showed a general tendency to increase as a function of distance from the face. Their maximum values remained, however, still lower in value than the corresponding velocities in the vertical direction. Near the face, the differences in velocities were considerably greater: with horizontal velocities considerably lower in value than those v~rtical.

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Ultrasonic characteristics of a rock mass

Cited by 23 publications

References 12 publications

Cross-hole acoustic surveying in basalt

Cross-hole acoustic surveying in basalt

Seismic velocities and attenuation in an underground granitic waste repository subjected to heating

Cross-hole acoustic measurements in basalt

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