Abstract
A relatively simple model of acoustic pulse propagation in rock is proposed, using the concept of an effective wavelength varying linearly with distance to describe changes in pulse first arrival amplitude and rise-time. The model predictions are shown to be consistent with the results obtained by using the Kjartansson transfer function to numerically propagate a wide range of source acoustic pulses. The model is applied to a large quantity of data obtained with two very different acoustic sources, to find the rock quality factor Q for a granite rock mass. Similar average values of Q are obtained for the two sources, with different calculated values of the seismic parameter C. The values of Q obtained in this way also agree closely with values obtained using a method based on the Kjartansson transfer function. Repeated scanning over many paths reveals a wide variation of Q, considered to reflect variability in rock mass structure. The distribution of the values of Q in the granite rock mass is found to be log-normal.
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