The upward movement of objects during long-term breakout was 

 monitored with a simple deflection gage. The movement of the inner end 

 of the lever relative to the side of the 55-gallon drum was measured. 



Three objects were used in the testing: a 3 x 3 x 3-inch block, a 

 6 X 6 X 6-inch block, and a 9 x 9 x 6-inch block. The blocks were concrete, 

 and their weights in seawater were; 1 .39, 10.39, and 23.23 pounds, respec- 

 tively. The 9 X 9 X 6-inch block was always embedded with the 9 x 9-inch 

 plane horizontal. 



TEST SOIL 



The soil tested was a marine, clayey silt obtained from a tidal flat at 

 Seal Beach Naval Weapons Station, California. The soil was oven-dried, bro- 

 ken into particles, and mixed with saltwater to obtain desired strengths. Some 

 of the soil index properties are given in Table A-1 . 



Table A-1 . Properties of Typical Soil Sample — FY-71 Laboratory Tests 



Property 



Value or Description 



Bulk wet density (pcf) 



104 





Vane shear strength (psf) 



10 





Remolded strength (psf) 



5 





Sensitivity 



2 





Water content (%) 



57 





Specific gravity of solids 



2.60 





Void ratio 



1.45 





Liquid limit (%) 



41 





Plastic limit (%) 



26 





Plasticity index (%) 



15 





Sand (%) 



10 





Silt (%) 



58 





Clay {%) 



32 





Classification (Unified Soil Classification System) 



ML (slightly plastic clayey 



ilt) 



36 



