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首页> 外文期刊>Applied Ocean Research >Quantification of impact forces on fixed mudmats from submarine landslides using the material point method
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Quantification of impact forces on fixed mudmats from submarine landslides using the material point method

机译：用材料点法测量从潜艇滑坡的固定泥浆上的冲击力

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摘要

Quantification of impact forces from submarine landslides is vital to the safe design of mudmats and other subsea structures that are laid out in the hazard area. In this paper, the dynamic process of the submarine landslides running across a partially-embedded mudmat is analysed using a novel numerical method, the material point method (MPM). The mudmat is simplified as fixed in position, presenting an exposure height and length above the mudline. The seabed is taken as a rigid boundary to exclude the complicated seabed-slide interaction. Increase of the undrained shear strength of the sliding material with its shear strain rate is expressed with the Herschel-Bulkley rheological model. Non-dimensional parameters, the non-Newtonian Reynolds number and the Froude number, are adopted to characterise the kinematic behaviour of the slide. The horizontal steady forces on the mudmat obtained from the MPM analyses are verified by comparison with those using a computational fluid dynamics (CFD) method. An extensive parametric study is then conducted, allowing the forces to be interpreted using a hybrid model considering the combined effects of the inertia of the slide, its shear strength and also the asymmetric static pressure.
机译：来自潜艇滑坡的冲击力的量化对危险区域中布局的安全设计和其他海底结构的安全设计至关重要。本文使用新颖的数值方法，材料点法（MPM）分析了在部分嵌入的Mudmat中运行的潜艇滑坡的动态过程。 Mudmat被简化为固定在位置，呈现云线上的曝光高度和长度。海底被视为刚性边界，以排除复杂的海床滑动相互作用。用剪切应变速率的滑动材料的不驱涉剪切强度的增加与Herschel-Bulkley流变模型表达。采用非维度参数，非牛顿雷诺数和FRoude号码来表征幻灯片的运动行为。通过与使用计算流体动力学（CFD）方法的人进行比较，验证从MPM分析中获得的Mudmat上的水平稳定力。然后进行广泛的参数研究，允许使用混合模型来解释力考虑载玻片惯性的组合效果，其剪切强度以及不对称的静压。

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