SYMPOSIA PAPER Published: 01 January 1999

Borehole SASW Testing to Evaluate Log(G ) - Log(σ') Relationships in Situ


A new method is being developed for the in-situ measurement of shear wave velocity, Vs, in the soil surrounding a borehole. The method involves the measurement of axially propagating surface waves inside an uncased borehole using the Spectral-Analysis-of-Surface-Waves (SASW) approach. Testing is performed with instrumentation housed inside an inflatable tool. Inflation pressures applied by the tool are used to vary radial stresses in the soil surrounding the borehole. Surface wave velocities over a range of frequencies are measured at each inflation pressure. These measurements are then theoretically modeled so that the variation in Vs (and hence small-strain shear modulus, Gmax) with distance behind the borehole wall is determined at each pressure. The results of field tests with the borehole SASW tool at two sites composed of unsaturated clayey soils are presented. These results are compared with independent field seismic measurements and with laboratory tests on intact specimens using the torsional resonant column to assess the validity of the new field method.

Author Information

Kalinski, ME
University of Texas at Austin, Austin, Texas
Stokoe, KH
Univ. of Texas at Austin, Austin, Texas
Young, YL
University of Texas at Austin, Austin, Texas
Roesset, JM
Offshore Technology Research Center, College Station, Texas
Price: $25.00
Contact Sales
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Developed by Committee: D18
Pages: 137–155
DOI: 10.1520/STP13314S
ISBN-EB: 978-0-8031-5400-1
ISBN-13: 978-0-8031-2493-6