The Determination of 'In Situ'Anisotropic Elastic Moduli from Laboratory Ultrasonic and Field Seismic Measurements.

摘要

An operational method is described for the determination of the low-pressure elastic constants for a transversely isotropic rock mass under in situ conditions. The results are based on laboratory ultrasonic tests and field seismic measurements. Application of this method is made to the top thirty feet of the uppermost Kayenta sandstone unit at the Mixed Company site, for which the in situ elastic moduli are determined to be as follows: C11 = 125 kbar, C12 = 60 kbar, c13 = 34 kbar, C33 = 51 kbar and C44 = 26 kbar. It is shown that previously recommended parameters describing both the elastic and plastic anisotropic properties of Kayenta sandstone from the Mixed Company site are in poor agreement with newly generated data. (Author)