Linear and Nonlinear Ultrasonic Properties of Granular Soils
- LLNL
The ultrasonic pulse transmission method (100-500 kHz) was adapted to measure compressional (P) and shear (S) wave velocities for synthetic soils fabricated from quartz-clay and quartz-peat mixtures. Velocities were determined as samples were loaded by small (up to 0.1 MPa) uniaxial stress to determine how stress at grain contacts affects ave amplitudes, velocities, and frequency content. Samples were fabricated from quartz sand mixed with either a swelling clay or peat (natural cellulose). P velocities in these dry synthetic soil samples were low, ranging from about 230 to 430 m/s for pure sand, about 91 to 420 m/s for sand-peat mixtures, and about 230 to 470 m/s for dry sand-clay mixtures. S velocities were about half of the P velocity in most cases, about 130 to 250 m/s for pure sand, about 75-220 m/s for sand-peat mixtures, and about 88-220 m/s for dry sand-clay mixtures. These experiments demonstrate that P and S velocities are sensitive to the amount and type of admixed second phase at low concentrations. They found that dramatic increases in all velocities occur with small uniaxial loads, indicating strong nonlinearity of the acoustic properties. Composition and grain packing contribute to the mechanical response at grain contacts and the nonlinear response at low stresses.
- Research Organization:
- Lawrence Livermore National Lab., CA (US)
- Sponsoring Organization:
- USDOE Office of Defense Programs (DP) (US)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 791377
- Report Number(s):
- UCRL-JC-136207
- Country of Publication:
- United States
- Language:
- English
| Elastic properties of sand-peat moss mixtures from ultrasonic measurements | report | September 1998 |
Ultrasonic Attenuation Measurement by Spectral Ratios Utilizing Signal Processing Techniques
|
journal | April 1981 |
Compressional velocity and porosity in sandâclay mixtures
|
journal | April 1992 |
Similar Records
Compressional and Shear Wave Velocities for Artificial Granular Media Under Simulated Near Surface Conditions
Ultrasonic Velocities in Unconsolidated Sand/Clay Mixtures at Low Pressures
Seismic Velocities Contain Information About Depth, Lithology, Fluid Content, and Microstructure
Conference
·
Sun Sep 09 00:00:00 EDT 2001
·
OSTI ID:827625
Ultrasonic Velocities in Unconsolidated Sand/Clay Mixtures at Low Pressures
Conference
·
Fri Oct 15 00:00:00 EDT 1999
·
OSTI ID:792605
Seismic Velocities Contain Information About Depth, Lithology, Fluid Content, and Microstructure
Conference
·
Wed Jan 02 23:00:00 EST 2002
·
OSTI ID:15004635