Research Article
Oct 1971
Long-Term Pressure Effects on Shear Modulus of Soils
Publication: Journal of the Soil Mechanics and Foundations Division
Volume 97, Issue 10
Abstract
Long-term resonant-column tests were performed on seven air-dry soils to determine their small-strain dynamic behavior under confining pressures maintained for durations up to 803 days. Test results indicate that: (1) The shear modulus of air-dry soils at constant confining pressure increases with time; (2) the shear modulus after 2 years can be predicted within 15% from 2-day tests; (3) the time-dependent increase in modulus increases with decreasing particle size; (4) the time-dependent increase in density under a constant pressure accounts for only 0-15% of the total time-dependent modulus increase; (5) continuous low amplitude vibration (shearing strain less than 0.00001) has no measurable effect on the soils tested over and above the time-dependent modulus increase; and (6) a 10-psi step increase in pressure may destroy up to 15% of the time-dependent modulus accumulated with time in clay, but does not influence sand or silt.
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Information
Published In
Journal of the Soil Mechanics and Foundations Division
Volume 97 • Issue 10 • October 1971
Pages: 1445 - 1460
Copyright
© 1971 American Society of Civil Engineers.
History
Published in print: Oct 1971
Published online: Feb 12, 2021
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Sherif S. Afifi, AM.ASCE
Staff Engr., Woodward-Lundgren & Associates, Oakland, Calif.
Richard D. Woods, M.ASCE
Asst. Prof. of Civ. Engrg., The Univ. of Michigan, Ann Arbor, Mich.
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