The suction anchor develops a vertical breakout resistance by creating a smaller pressure beneath the anchor than the ambient pressure. The breakout behavior of model suction anchors in various soils was described. Based upon the observed failure mechanism together with the Mohr-Coulomb failure theory, a vertical breakout capacity equation for suction anchors was developed. This breakout capacity equation was presented in graphical form to facilitate computations for anchor design. Two numerical examples were given to illustrate engineering applications of the design charts.The suction anchor could be attached to offshore structures to assist withi~tallation problems and to improve stability during extreme 'events such as hurricanes. Because of their ability to increase foundation stability, suction anchors could also possibly be used to reduce the mass of. needed concrete in gravity structures, and thus reduce the cost of construction. Other potential applications of the suctionaILc~or Lnclude the anchorage of research submersibles, bottom coring platforms, and certain salvage and dredging operations. This study provides a method of assessing the value of suction-anchors by predicting anchor capacity from soil properties, anchor geometry, and suction intensity.
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