In-Situ Undrained Shear Strength of Two Marine Clays

by Demetrious C. Koutsoftas, (A.M.ASCE), Project Engr.; Dames and Moore, Cranford, N.J.,
Joseph A. Fischer, (M.ASCE), Partner; Dames and Moore, Cranford, N.J.,

Serial Information: Journal of the Geotechnical Engineering Division, 1976, Vol. 102, Issue 9, Pg. 989-1005

Document Type: Journal Paper


Field testing was performed at an offshore site approx 2.8 miles (4.5 km) from the New Jersey coast, with water depths of 35 ft ± 5 ft (10.7 ± 1.5 m) to evaluate the undrained strength of two relatively young (8,000 ± yr old) cohesive marine soils; a stiff plastic clay (CH) and a medium-stiff, lean, slightly sensitive clay (CL). Numerous cnsolidation tests indicate that the relatively young Holocene sediments are precompressed resulting in overconsolidation ratios ranging from 3.5 to 6 for the plastic clay (CH) and between 5 and 25 for the silty clay (CL). The normalized undrained shear strength Suvo from UUC tests and field vane tests were correlated with the overconsolidation ratios of these sediments and compared with the results of Ko-consolidated undrained triaxial compression (CK\a*o\a*U\a*C), and direct-simple shear (CK\a*o\a*U\a*DSS) tests.

Subject Headings: Triaxial tests | Shear strength | Soil strength | Marine clays | Clays | Shear tests | Soil tests | Compression tests | New Jersey | United States

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