甲板昇降型作業台船の脚パンチスルー

概要

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An occurrence of a punch-through phenomenon causes the stability of jack-up type offshore working platforms to be declined. Accordingly, the possibilities of such occurrences of punch-through phenomena have been markedly important subjects of discussions. No rules, however, specify definite regulations, and for the most part, rational investigations have not been conducted. In this paper, multi-layered grounds causing punch-through phenomena are classified and respective calculation equations of the bearing capacity were investigated. In particular, as to failures by punching shears in thin sand-layers which become a subject of problems with respect to offshore working platforms, rational calculation equations were selected conjointly with comparison calculations, in contrast to actual mesurement. As the result, concerning an optional combination of ground layers, the rational and simple method is given for obtaining the bearing capacity curves of legs of offshore working platforms.
社団法人日本船舶海洋工学会の論文
1988-03-22