Fluid-Structure-Soil Interactions (FSSI) of Water-Filled Tubes: An Alternative to Stacking Sandbags for Fighting Floods

洪水在美国和世界上许多其他国家造成了巨大的财产和生命损失。 沙袋经常被用来阻挡或试图阻挡洪水。 最近，已引入充水管作为替代临时防洪屏障。 然而，由于过度移动以及材料或接缝破裂，也会发生故障。 本研究计划旨在对这一概念进行全面的分析和实验研究，以提高其性能。除了其实际意义外，研究还解决了一个具有相当大的理论挑战性的问题，即高度柔性结构、内部和外部水以及土壤之间的相互作用：结构在填充时会发生巨大变形，并沉降到地下;洪水往往会将屏障推开或卷走，并由于渗漏而破坏屏障。 渗流与管道变形的耦合是该问题的一个特点。 动态效应也可能导致故障或倒塌，例如当管道受到波浪、水涌或漂浮碎片的冲击时。 因此，这项研究不仅有望更根本的了解这些管的防洪条件下的行为，并改进设计程序，但它也有望导致在各种应用中使用的基本方法的根本性进步。

CMS-9807335Plaut, RaymondFloods have caused enormous loss of property and life in the United States and many other countries of the world. Sandbags are often used to hold back, or attempt to hold back, floodwaters. Recently, water-filled tubes have been introduced as an alternative temporary flood barrier. However failures have occurred due to excessive movements and to material or seam rupture. This research program aims at a thorough analytical and experimental investigation of this concept so as to improve its performance.In addition to its practical importance, the research addresses a problem of considerable theoretical challenge; namely interactions among a highly-flexible structure, internal and external water, and soil: the structure deforms greatly when filled, and settles into the ground; floodwaters tend to push or roll the barrier away and to undermine it due to seepage. The coupling of seepage with deformations of the tube conforming in shape to the ground is a special feature of the problem. Dynamic effects also can lead to failure or collapse, such as when the tube is struck by waves, a surge of water, or floating debris. Thus this study promises not only a more fundamental understanding of the behavior of these tubes under flood-control conditions, and improved design procedures, but it is also expected to result in fundamental advances in basic methodologies of use in a wide variety of applications.