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ASTM Selected Technical Papers
Nondestructive and Automated Testing for Soil and Rock Properties
By
WA Marr
WA Marr
1
GeoTesting Express, Inc.
?
Boxborough, MA Symposium Cochairman and Coeditor
Search for other works by this author on:
C Fairhurst
C Fairhurst
2
Geomechanical and Structural Testing Systems MTS Systems Corporation
?
Eden Prairie, MN Symposium Cochairman and Coeditor
Search for other works by this author on:
ISBN-10:
0-8031-2493-7
ISBN:
978-0-8031-2493-6
No. of Pages:
321
Publisher:
ASTM International
Publication date:
1999

Surface wave measurements were made in horizontal drilled shafts in rock salt to characterize the stiffness of the rock around the shafts. The Spectral-Analysis-of-Surface-Waves (SASW) method was used to determine dispersion curves of surface wave velocity versus wavelength. Dispersion curves were measured for surface waves propagating axially and circumferentially in the shafts. Surface wave velocities determined from axial testing increased slightly with increasing wavelength due to the cylindrical geometry of the shafts. On the other hand, surface wave velocities determined from circumferential testing exhibited a completely different type of geometry-induced dispersion. In both instances, finite-element forward modeling of the experimental dispersion curves revealed the presence of a thin, slightly softer disturbed rock zone (DRZ) around the shafts. This phenomenon has been previously confirmed by crosshole and other seismic measurements and is generally associated with relaxation of the individual salt crystals after confining stress is relieved by excavation.

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