Unclassified 



Socunly Classification 



DOCUMENT CONTROL DATA R&D 



Naval Civil Engineering Laboratory 

 Port Hueneme, California 93041 



Unclassified 



NAVAL IN-PLACE SEAFLOOR SOIL TEST EQUIPMENT: A PERFORMANCE 

 EVALUATION 



S(OTE5 (Type of report and tnclue 



I (FUMt name, middle Initial, lael name) 



R. J. Taylor and K. R. Demars 



October 1970 



45 



13 



YF 38.535.002.01.001 



TN-1135 



NO<S) (Any other numbers that may be atalgne 



This document has been approved for public release and sale; its 

 distribution is unlimited. 



Naval Facilities Engineering 

 Command 



The Naval Civil Engineering Laboratory (NCEL) has developed a 

 vane shear and cone penetrometer apparatus capable of obtaining the 

 in-place undrained shear strength of sediments to a depth of 10 feet 

 in the seafloor. The device is a subsystem of the Deep Ocean Test 

 In-Place and Observation System (DOTIPOS). Information obtained with 

 this equipment will enhance the Navy's ability to design foundations 

 more economically and reliably for seafloor installations. The 

 results of tests performed at 100- and 600-foot deep sites and the 

 evaluation of DOTIPOS and the vane shear and cone penetrometer 

 apparatus are presented. 



The DOTIPOS-mounted vane shear and cone penetrometer apparatus 

 operates satisfactorily to water depths of 600 feet and produces 

 results which appear reasonable when compared to previous theoretical 

 and laboratory experimental results. Laboratory and in-situ vane 

 shear results are in reasonable agreement; however, the in-situ 

 results exceed the laboratory results by 10 to 20 percent. A 

 relationship between percent clay content of the sediment and the 



Cont'd 



DD.?o?.,1473 



S/N 0101.807-6801 



Unclassified 



