Dynamic Shearing Properties Of Compacted Clay

by R. E. Olson, Professor of Civil Engineering; University of Illinois, Urbana, IL,
J. F. Parola, Graduate Research Assistant; Department of Civil Engineering, University of Illinois, Urbana, IL,

Part of: From Soil Behavior Fundamentals to Innovations in Geotechnical Engineering: Honoring Roy E. Olson


A series of 116 Q-type triaxial compression tests was performed using specimens of Goose Lake clay compacted at water contents ranging from 9 percent dry of optimum to 3 percent on the wet side. The specimens were subjected to confining pressures ranging from 10 psi to 1000 psi and were loaded to failure in times ranging from 2 ms to an hour. The average increase in compressive strength per decade reduction in time to failure, for specimens compacted at water contents near optimum, increased from about 2 percent f or the range 100 min-10 min to 18 percent for the range 60 ms-6 ms. Specimens compacted at lower water contents underwent smaller strength increases in dynamic tests. The secant modulus, defined at 1 percent axial strain, increased at a rate of about 15 percent per decade reduction in time to failure. The compressive strength and stress-strain properties of the Goose Lake clay are shown to vary between wide limits depending on the compaction water content, the confining pressure, and the time to failure.

Copyright holder: Previously published in Proceedings, International Symposium on Wave Propagation and Dynamic Properties of Earth Materials, Albuquerque, New Mexico, 1968, 173-182


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