Conventional Anchor Test Results at San Diego and Indian Island
Technical note, Oct 1978-Dec 1979
CIVIL ENGINEERING LAB (NAVY) PORT HUENEME CA
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The Navy has initiated a program to improve fleet mooring capability through tests of existing fleet moorings and a range of conventional anchors in use and projected for use. The results of site surveys and of instrumented anchor and mooring tests at San Diego Harbor, Calif., and at Indian Island, Wash., are presented. Emphasis in the tests was on defining the applicability limits of the Navys primary fleet mooring anchor, the Stockless anchor, through tests of single and tandem anchors. The Navy can use the data immediately for selection and sizing of anchors for sites typical of San Diego sand and Indian Island silty clay seafloors. Other anchors tested included the Navy STATO, BRUCE, Hook, and STEVIN anchors. Test data are presented primarily as plots of anchor penetration, holding capacity, and shank pitch and roll as functions of anchor drag distance. Tandem Stockless anchor arrangements were found that could be easily installed and that resulted in individual anchor efficiencies equal to or exceeding those determined through single-anchor tests. Several anchors were modified to achieve satisfactory performance in the test soils. Guidance for these changes is provided.
- Civil Engineering
- Marine Engineering