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SECURITY CLASSIFICATION OF THIS PAGEfWhei 



20. Continued 



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). 



Library card 

 I 



Civil Engineering Laboratory 

 DOSIST II - AN INVESTIGATION OF THE IN-PLACE 

 STRENGTH BEHAVIOR OF MARINE SEDIMENTS, by 

 H. J. Lee 



TN-1438 16 p. illus. June 1976 Unclassified 



1. Soil testing 2. Sediment cores I. YF52. 556.999 .01. 101 



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). 



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ASSITICATION OF THIS P AGEfWhe 



