TAtslc 1-1. Mos~ Gutdclincs for ScAfloor Ollcrations Subjcct N'bhicatiore Comiscnits A gcnscral soils ticsign NwAal lFacilitkcs linginccring Command, Design handbook ittnded prim MaInual OM.7. Soil mechanics foundationsissnd earth manly fur usc an land a struclures, Mar 1971 many procedures apphicable to undwa-ter use Naval CMvi Engineering Laboratory. TechnicA Repiort Most dctailecd guide R-799, tetrim design guidclincs for seafloor footing, book for seafloor foot-Foundations by 11. G. I Icrnann and 11.J. Valcnt. Oct 1973 ing dcsign Nival Civil Engineering I.3boratory. Tocchnical Noi A simplifiedl version of N*1 246, Vou~ndstions for small scafloor installation. TK-799 by It. G. I krrmann, Seps 1972 North American Rockwcll corporation. I andbook of A abokfrlrr ocean ind underwater nctering, Chapter 8, 1969 (~ri~3r) ie supported) structures A handbook for drag Naval Pacilities Hngineering Command, lDesign anchors and associated ,Manual DNI26. hlarbor and coastal facilities, Jul 1968 mooring equipmcni, sonic design informition Anchrin ciit Egincrig Ibornryhanbookforuplft. Colictc summary of Anchrin Ciil ngiccrng abortor, IUndookforuplft-uplift-rcsisting anchors resisting anchors, by R. J. Taylor, 1). joncs, and and decsign irnformation R. .M. Bcard, Sep 1975 (holding capacity inrormation is out of datc) Civil Engincering lsboratory, Long-termn holding Revised holding-eapacity capacity of statically loaded anchors in cohecsive soils, predliction procedares by R. hi. 11card (1979) Naval Civil Enginccring Lboratory, Technical Rclort Mlethiod for predicting Breakout R-755, Unaided breakour of partially embedded foc necded to dislodge objccts from cohecsive seafloor soils, by If. J. Lee,:i mcd ojt Fcb 1972 a meddojc dComplce entries will be found in Section 8, REFERENCES.

A series of eleven in situ penetration tests ,was conducted' 'by the Naval Civil Engineering Laboratory (NCEL) at two seafloor sites. The objectives 6f these tests were to illustrate the, capabi-itie ; 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 mechanPially. The resulting data were subjected to a regression anadlysis Whidh yielded information about the ,penetrationmedhanisii but no practical results:. This was followed 'by, a. physical ahalysfs based on, static soil mechanics relations., The latter analysis was sh6wnc to yield predictions of penetration depth which, were within. 50 percent of the waasured values. A suggested prediction technique based on this anal)sis is presented.