58 Seismic velocities and attenuation in an underground granite waste repository subjected to heating
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Published:1984
B. N. P. Paulsson, M. S. King, 1984. "58 Seismic velocities and attenuation in an underground granite waste repository subjected to heating", Design and Performance of Underground Excavations: ISRM Symposium — Cambridge, U.K., 3–6 September 1984, E. T. Brown, J. A. Hudson
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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 times-of-flight of pulses of acoustic waves between transducers clamped to the borehole wall. The attenuation was obtained by a spectral ratios technique. When the heater was 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 associated thermal stresses, but there was a good correlation of attenuation with water content and the related changes in pore pressure.
INTRODUCTION
EXPERIMENTAL PROCEDURES
RESULTS AND DISCUSSION
CONCLUSIONS
ACKNOWLEDGEMENTS
REFERENCES
