STRESS WAVE PROPAGATION IN CONFINED SOILS
Abstract
Phenomenon involved with the propagation of air-induced stress waves in soil were investigated in experiments on Edgar Plastic Kaolin (EPK) clay and Ottawa sand. The principal soil variables were moisture content and density in the case of clay, and density in the case of sand. The soil specimens were loaded with overpressures in the range of from approximately 50 to 300 psi. Two overpressure wave shapes were used, one where peak overpressure had a dwell time of approximately 1 msec and the other having essentially a zero dwell time of peak pressure. Stress-time and strain-time relationships were measured at various points along the length of the specimens. Peak stress attenuation, strain and strain-rate relationships, propagation velocity, changes in wave shape, and stress-strain relationships are discussed in the light of the data obtained. Experimental data are compared with theoretical predictions of a linear hysteretic model in the case of Ottawa sand, and a constant tan Omega viscoelastic model, in the case of the EPK clay. It was found that in both cases the theories could be used to predict the experimental results with proper evaluation of critical attenuation parameters to be input with the theories.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1966
- Accession Number
- AD0801912
Entities
People
- Delon Hampton
- R. A. Wetzel
Organizations
- IIT Research Institute