Reduction of Embedment Anchor Capacity Due to Sediment Disturbance.
Final rept. Jul 74-Jun 76,
CIVIL ENGINEERING LAB (NAVY) PORT HUENEME CALIF
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The results of field testing propellant-actuated embedment anchors are presented. A large number of field tests were run in which 9 x 18-inch anchors were fired or pushed into a very soft, moderately sensitive clayey silt. A comparison is made between the predicted and observed holding capacities. The measured short-term holding capacities of these anchors were 75 to 85 of those predicted. This reduction in capacity could not be attributed to sediment disturbance during anchor penetration, but is thought to result primarily from sediment disturbance during anchor keying. Sediment disturbance during penetration does have a significant effect on anchor keying distance and, depending on the sediment strength profile and penetration, has an indirect effect on anchor holding capacity. A recommendation is made to reduce the computed holding capacity by 20 for anchors in the field. Author
- Marine Engineering