Research Article
May 1976
Time-Dependent Increase in Shear Modulus of Clay
Publication: Journal of the Geotechnical Engineering Division
Volume 102, Issue 5
Abstract
Two time domains for modulus increase have been identified, primary and secondary. Primary is the same as for primary consolidation and secondary is the open interval after primary in which modulus increases continuously with time. It was found that all cohesive soils exhibit secondary modulus increase, i.e., (1) The modulus increase for clays ranges from 3% to 20% per logarithmic cycle of time; (2) confining pressure dependence can be removed by normalizing modulus based on the 1,000-min modulus; and (3) secondary increases in modulus occur at all shear strain amplitudes. The rate of secondary increase is related to the undrained shearing strength and the initial void ratio of the soil. An empirical equation is presented to show this relationship. Thixotropy best explains secondary modulus increase.
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Published In
Journal of the Geotechnical Engineering Division
Volume 102 • Issue 5 • May 1976
Pages: 525 - 537
Copyright
© 1976 American Society of Civil Engineers.
History
Published in print: May 1976
Published online: Feb 11, 2021
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Authors
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Donald G. Anderson, AM.ASCE
Project Engr., Fugro, Inc., Consulting Engrs. and Geologists, Long Beach, Calif
Richard D. Woods, M.ASCE
Assoc. Prof. of Civ. Engrg., Univ. of Michigan, Ann Arbor, Mich
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