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

CMS-9807335 Plaut，RaymondFloods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，充水管道被引入作为一种替代的临时防洪屏障。然而，由于过度移动和材料或接缝破裂，出现了故障。这项研究计划旨在对这一概念进行深入的分析和实验研究，以提高其性能。除了它的实际重要性之外，这项研究还解决了一个具有相当大理论挑战性的问题；即高度灵活的结构、内外水和土之间的相互作用：结构在填土时变形很大，并沉入地下；洪水往往会将屏障推开或推开，并因渗流而破坏它。渗流与与地面形状一致的管道变形的耦合是这一问题的一个特点。动力效应也可能导致失效或坍塌，例如当管道被海浪、涌水或漂浮的碎片击中时。因此，这项研究不仅承诺对这些管道在防洪条件下的行为有更基本的了解，并改进设计程序，而且还有望在各种应用中使用的基本方法方面取得根本性进展。

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.