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 language | English |
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Pages (from-to) | 180-187 |
Number of pages | 8 |
Journal | Geotechnical Testing Journal |
Volume | 28 |
Issue number | 2 |
State | Published - 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