A new free-free resonant column device for measurement of Gmax and Dmin at higher confining stresses

M. E. Kalinski, M. S.R. Thummaluru

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

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′0), 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′0 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′0 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′0 that are more representative of in situ conditions. Copyright

Original languageEnglish
Pages (from-to)180-187
Number of pages8
JournalGeotechnical Testing Journal
Volume28
Issue number2
StatePublished - Mar 2005

Keywords

  • Confining stress
  • Resonant column
  • Shear wave velocity
  • Small-strain material damping
  • Small-strain shear modulus
  • Soil dynamics

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology

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