Effect of State of Stress on Velocity of Low-Amplitude Compression Waves Propagating along Principal Stress Directions in Dry Sand.
Abstract
Little research has been performed in which the effect of biaxial and triaxial states of stress on the propagation velocity of compression and shear waves has been investigated. Therefore, a triaxial testing device was constructed, and an initial test series was performed to determine the relationship between propagation velocities and state of stress in a dry sand. The testing device was constructed of reinforced steel and was designed to hold a cubic soil sample measuring 7 ft (2.1 m) on a side. Rubber membranes were placed between the soil and three mutually perpendicular walls of the cube, corresponding to the three principal planes. Stress and strain measuring devices were also placed in the soil. The effects on compression of the sample were determined. Structural anisotropy caused a variation between principal stress axes of about ten percent in velocity at a given pressure. Stress history resulted in no noticeable variation in P-wave velocity and, therefore, was neglected. Biaxial and triaxial loading results lead to the same conclusion, namely that the velocity of compression waves propagating along principal stress directions in dry sand as low-amplitude body waves depends only on the stress in the direction of wave propagation.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1982
- Accession Number
- ADA120425
Entities
People
- David P. Knox
- Kenneth H. Stokoe Ii
- Stewart E. Kopperman
Organizations
- University of Texas at Austin