Hydraulic performance, wave loading and response of Elastocoast revetments and their foundation - a large scale model study -
Hydraulic performance, wave loading and response of Elastocoast revetments and their foundation - a large scale model study -
复制标题
Elastocoast 护岸及其地基的水力性能、波浪载荷和响应 - 大型模型研究 -
DOI：
--
复制
发表时间：
2010
期刊：
影响因子：
--
通讯作者：
M. Kudella
中科院分区：
文献类型：
--
作者：
H. Oumeraci;T. Staal;Saskia Pfoertner;Gisa Ludwigs;M. Kudella
ELASTOCOAST 护岸是由碎石制成的高度多孔结构，由聚氨酯 (PU) 持久且弹性地粘合。为了加深对波浪-结构-基础相互作用所涉及的物理过程的理解，并开发水力性能和波浪载荷的预测公式，使用规则和不规则波浪进行了超过 75 次大型模型试验。对三种 ELASTOCOAST 护岸方案进行了测试，它们具有相同的坡度 (1:3) 和相同的护岸厚度 (0.20 m)，但底层过滤层的厚度不同（模型方案 A、B 和 C 分别为 0.00 m、0.10 m 和 0.20 m）。使用了超过 85 个同步连接到两个摄像机的测量设备。开发了波浪反射、波浪上升和下降的预测公式，作为海浪相似参数的函数，这说明了 ELASTOCOAST 护岸与传统护岸相比的优势。例如，与光滑的不渗透护岸相比，波浪上升可能会减少 25% 以上。使用基于冲浪相似性的波浪载荷分类以及时间和空间上的系统参数化，还开发了护岸上和正下方的冲击载荷的预测公式。这些包括峰值压力 pmax、其相对于静水位 zpmax 的位置、空间压力分布和时间相关参数（上升时间和总负载持续时间）。还提供了护岸下方砂芯中波致孔隙压力的预测公式，包括砂层上边界的最大压力及其向更深层的发展。还提出了 ELASTOCOAST 护岸的弯曲位移 a 的公式，表明对于冲击载荷，产生的位移比非冲击载荷小得多，并且对于给定的护岸厚度，a 随峰值压力 pmax 线性增加。最后，根据测量结果和同时录制的视频对模型替代 A 进行稳定性分析。结果说明了为什么替代模型因局部瞬时土壤液化而失败，而在相同波浪条件下同步测试的替代模型 B 却没有失败。
ELASTOCOAST revetments are highly porous structures made of crushed stones which are durably and elastically bonded by Polyurethane (PU). To improve the understanding of the physical processes involved in the wave-structure-foundation interaction and to develop prediction formulae for both hydraulic performance and wave loading more than 75 large-scale model tests using both regular and irregular waves were performed. Three ELASTOCOAST revetment alternatives with the same slope (1:3) and the same revetment thickness (0.20 m) but with different thicknesses of the underlying filter layer (0.00 m, 0.10 m and 0.20 m for Model Alternatives A, B and C, respectively) were tested. More than 85 measuring devices synchronously connected to two video cameras were used. Prediction formulae are developed for wave reflection, wave run-up and run-down as a function of the surf similarity parameter which illustrate the advantage of ELASTOCOAST revetments as compared to conventional revetments. For instance, more than 25% less wave runup may result on comparison to smooth impermeable revetments. Using a surf similarity-based wave load classification as well as a systematic parametrization in both time and space, prediction formulae are also developed for both impact loads on and just beneath the revetment. These include the peak pressure pmax, its location in relation to still water level zpmax, the spatial pressure distribution and the time related parameters (rise time and total load duration). Prediction formulae for the wave-induced pore pressure in the sand core beneath the revetment are also provided, including the maximum pressure at the upper boundary of the sand layer and its development in deeper layers. Formulae are also proposed for the flexural displacement a of the ELASTOCOAST revetment, showing that for impact load much smaller displacements would result than for non-impact load and that a linearly increases with peak pressure pmax for a given revetment thickness. Finally, a stability analysis of Model Alternative A is performed on basis of the results of the measurements and the simultaneously recorded videos. The results illustrate why Model Alternative failed due to local transient soil liquefaction while Model Alternative B tested synchronously under the same wave conditions did not fail.