Unclassified 



Socvmlv Classification 



DOCUMENT CONTROL DATA -R&D 



Naval Civil Engineering Laboratory 

 Port Hueneme, California 93043 



Unclassified 



SEAFLOOR PENETRATION TESTS: PRESENTATION AND ANALYSIS OF RESULTS 



DESCRIPTIVE NOTES (Type ot report and Inclusive dates) 



Not final; December 1969-July 1970 



tiddtt Inlllml. It 



H. J. Migliore and H. J. Lee 



August 1971 



60 



12 



YF 38.535.002.01.009 



TN-1178 



thai may be assign 



Approved for public release; distribution unlimited. 



Naval Facilities Engineering 

 Command 



A series of eleven in situ penetration tests was conducted by 

 the Naval Civil Engineering Laboratory (NCEL) at two seafloor sites. 

 The objectives of these tests were to illustrate the capabilities 

 of existing penetration evaluation equipment and to acquire data 

 for use in evaluating a series of proposed penetration prediction 

 techniques. The tests consisted of allowing two types of objects 

 to free-fall into the seafloor with the accelerations experienced by 

 the objects during penetration being recorded mechanically. The 

 resulting data were subjected to a regression analysis which yielded 

 information about the penetration mechanism but no practical results. 

 This was followed by a physical analysis based on static soil 

 mechanics relations. The latter analysis was shown to yield 

 predictions of penetration depth which were within 50 percent of the 

 measured values. A suggested prediction technique based on this 

 analysis is presented. 



DD 



„1473 



Unclassified 



S/N 0101-807.680 1 



