Journal Published Online: 05 January 2005
Volume 28, Issue 2

A New Free-Free Resonant Column Device for Measurement of and at Higher Confining Stresses



The fixed-free resonant column device has traditionally been used to measure shear modulus in laboratory soil and rock specimens. It is a proven method that provides measurements over a range of shear strain and effective confining stress (σ′o), but the test relies on a specialized system of coils and magnets. The free-free resonant column device is a simpler device that allows for measurement of small-strain shear modulus (Gmax) and small-strain material damping (Dmin). However, σ′o in the free-free device has traditionally been limited to a maximum attainable vacuum pressure of around 80 kPa, because the test has not been configured in a pressurized cell. Therefore, a new free-free device was developed to allow measurements in a pressurized cell with σ′o greater than 80 kPa, while remotely exciting the specimen with a rotary solenoid. Test results demonstrate its potential for measuring Gmax and Dmin under higher levels of σ′o that are more representative of in situ conditions.

Author Information

Kalinski, ME
University of Kentucky, Lexington, KY
Thummaluru, MSR
Alexcom and Associates, Fredricksburg, VA
Pages: 8
Price: $25.00
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Stock #: GTJ12187
ISSN: 0149-6115
DOI: 10.1520/GTJ12187