DOSIST II - An Investigation of the In-Place Strength Behavior of Marine Sediments.
Technical note Jul 74-Jul 75,
CIVIL ENGINEERING LAB (NAVY) PORT HUENEME CALIF
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DOSIST II Deep Ocean Sampling and In-Situ Testing was a cruise in the Western North Atlantic Ocean conducted to evaluate the in-place engineering behavior of several typical deep ocean sediments. In-place vane shear tests were performed, and sediment cores gravity, piston, and box were taken. Laboratory tests were conducted on the cored samples to classify the sediments and to determine which testing procedure best reproduces the measured in-place strength. This was found to be consolidated-undrained triaxial testing. The sediments tested in-place were a foraminifera-dominated calcareous ooze and a proximal turbidite. Both of these sediments are nearly cohesionless and retain little of their in-place strength when sampled. A deep sea pelagic clay was cored and subjected to laboratory testing, but was not tested in-place. Estimated in-place strength profiles were derived for each of these sediments to subbottom depths in excess of 50 feet 15 m.
- Physical and Dynamic Oceanography
- Geology, Geochemistry and Mineralogy