Location

St. Louis, Missouri

Session Start Date

4-2-1995

Session End Date

4-7-1995

Abstract

Wave transmission tests were conducted on specimens of Eglin and Ottawa 20-30 sands at saturations varying from dry to near 100% using a Split-Hopkinson Pressure Bar. Specimens were compacted to a constant dry density in a thick-walled stainless steel container using a standard Proctor hammer. Compacted specimens were loaded in undrained, dynamic uniaxial confined compression at strain rates of approximately 13/s to 19/s. Tests were conducted on dry specimens; specimens compacted moist and tested moist; specimens compacted moist and dried before testing. For a constant input stress, transmitted stress and compressional wave propagation velocity were seen to vary with saturation. The experimental evidence suggests that the observed behavior can be attributed to variations in soil stiffness, microstructure and locked-in stresses as a result of moisture conditions present during compaction.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Meeting Name

Third Conference

Publisher

University of Missouri--Rolla

Publication Date

4-2-1995

Document Version

Final Version

Rights

© 1995 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Apr 2nd, 12:00 AM Apr 7th, 12:00 AM

Stress Wave Propagation in Unsaturated Sands

St. Louis, Missouri

Wave transmission tests were conducted on specimens of Eglin and Ottawa 20-30 sands at saturations varying from dry to near 100% using a Split-Hopkinson Pressure Bar. Specimens were compacted to a constant dry density in a thick-walled stainless steel container using a standard Proctor hammer. Compacted specimens were loaded in undrained, dynamic uniaxial confined compression at strain rates of approximately 13/s to 19/s. Tests were conducted on dry specimens; specimens compacted moist and tested moist; specimens compacted moist and dried before testing. For a constant input stress, transmitted stress and compressional wave propagation velocity were seen to vary with saturation. The experimental evidence suggests that the observed behavior can be attributed to variations in soil stiffness, microstructure and locked-in stresses as a result of moisture conditions present during compaction.