Effect of Cyclic Loads on Undrained Strength of Two Marine Claysby Demetrious C. Koutsoftas, (A.M.ASCE), Sr. Engr.; Dames & Moore, Cranford, N.J.,
Serial Information: Journal of the Geotechnical Engineering Division, 1978, Vol. 104, Issue 5, Pg. 609-620
Document Type: Journal Paper
Specimens were first isotropically consolidated, then subjected to stress-controlled cyclic loading, and finally monotonically loaded to failure. Tests were conducted on normally consolidated specimens and overconsolidated specimens with an overconsolidation ratio of 4. Comparisons with the results of standard undrained triaxial compression tests indicate that cyclic loading prior to undrained shear causes a small reduction in undrained shear strength and a significant reduction in undrained modulus. Excess pore-water pressures generated by cyclic loading were also found to correlate well with the double amplitude strain induced by cyclic loading. A reduction in effective stress is associated with the excess pore pressures. The decrease in effective stress is largely responsible for the reduction in undrained shear strength after cyclic loading.
Subject Headings: Cyclic loads | Soil strength | Marine clays | Cyclic strength | Shear strength | Effective stress | Shear tests | Triaxial tests | Failure loads | Triaxial loads | Compression tests
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