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Quasi-static numerical modelling of ore cargo during shipping

机译:矿石货物运输过程的准静态数值模拟

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Since 2005, there have been increases in the rate of ore carriers casualties and crew fatalities. These incidents have preoccupied international organizations and many research laboratories which have mobilised to identify the causes and seek the solutions. The liquefaction of the loaded ore is considered to be the major cause of the capsizing and sinking of ore carriers, but the mechanisms that lead to these incidents still remain uncertain. This study presents an analysis of the ore cargo stability and examines the stress distribution by means of a quasi-static numerical model. Afterwards, an assessment of the shear ratio variation, in terms of the hold inclination is established, in order to prevent sliding failure of an ore cargo. According to this research, at hold inclination of 15°, the maximum shear ratio is less than 0.2 in all areas of the ore cargo, except under the residual slopes and at the surface. Therefore, these parts are assumed to be the most vulnerable areas to the hold inclination under static loading. This paper presents a first approach of a work that will be further developed to elaborate a dynamic model that can reproduce the ore carrier motions while shipping and the behavior of the cargo in the hold. The final objective of this study is to help ship owners better understand how to prevent the ore carriers from capsizing during shipping and also provide the International Maritime Organisation with a new test to predict the liquefaction potential of the loaded ore.
机译:自2005年以来,矿石运输公司的人员伤亡和船员死亡的比率有所增加。这些事件已引起国际组织和许多研究实验室的关注,它们动员起来查明了原因并寻求解决方案。负载矿石的液化被认为是导致矿石载体倾覆和下沉的主要原因,但是导致这些事件的机理仍然不确定。这项研究提出了对矿石货物稳定性的分析,并通过准静态数值模型检查了应力分布。此后,建立关于保持倾角的剪切比变化的评估,以防止矿石货物的滑动失效。根据这项研究,在15°的固定倾角下,除剩余坡度和地表外,所有矿石货物区域的最大剪切比均小于0.2。因此,假定这些部分是静态载荷下最容易发生保持倾斜的区域。本文介绍了一种工作的第一种方法,该方法将进一步发展以建立一个动态模型,该模型可以重现运输过程中矿石运输船的运动以及货舱中货物的行为。这项研究的最终目的是帮助船东更好地了解如何防止矿石运输船在运输过程中倾覆,并为国际海事组织提供一项新的测试方法,以预测装载矿石的液化潜力。

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