液状化による含水精鉱の荷崩れ

概要

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The mineral concentrate cargo which has high moisture contents may shift owing to liquefaction when the ship is exposed to rough weather. This may result in a dangerous heel of ship and eventually capsize. In this paper, the characteristics of liquefaction of barite, pyrite, and lead concentrates are investigated on the basis of the cyclic triaxial test. It is shown that the relation between the volume of liquefied concentrate and duration of ship motion can be calculated with the use of experimental data and the linear stress analysis. The results of simulation test with barite concentrate show good agreement with analytical results. The advantage of the use of shifting board is examined with the proposed method. It is shown that the shifting board with appropriate depth and rigidity prevents considerable amount of mass of concentrate from liquefaction.
社団法人日本船舶海洋工学会の論文