Accession Number : AD0768291

Title :   Engineering Properties of a Pelagic Clay.

Descriptive Note : Technical note Apr 72-Jan 73,

Corporate Author : NAVAL CIVIL ENGINEERING LAB PORT HUENEME CALIF

Personal Author(s) : Lee,H. J.

Report Date : AUG 1973

Pagination or Media Count : 35

Abstract : Pelagic clay is a common ocean soil type covering over 30 percent of the seafloor. Two high quality box core samples of pelagic clay were obtained and subjected to index and engineering property testing. The results of tests on both cores were similar indicating little areal variability. The shear strength near the soil-water interface was about one psi, a relatively high value, and the soil was found to be virtually incompressible up to a compressive stress of about four psi. When remolded, the strength of the soil was significantly decreased, by as much as a factor of six. The soil was also found to be very compressible beyond a stress of four psi. A technique was developed for using triaxial test results to derive shear strengths below the level of sampling. The resulting strength profile indicates a very gradual increase of strength with depth. Implications regarding the use of direct embedment anchors are discussed. (Author)

Descriptors :   (*ENGINEERING GEOLOGY, OCEAN BOTTOM), (*CLAY, *OCEAN BOTTOM), (*SOIL MECHANICS, CLAY), MOISTURE, GRAIN SIZE, SHEAR STRESSES, COMPRESSIVE PROPERTIES, PACIFIC OCEAN

Subject Categories : Physical and Dynamic Oceanography
      Soil Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE