On the toe stability of rubble mound structures

Etemad-Shahidi Amir; Bali Meysam; van Gent Marcel R. A.

摘要

Toe design is an important task for coastal engineers as it ensures the stability of the main armor layer and prevents scour in front of the armor slope. Several laboratory experiments have been conducted to investigate the toe stability using different testing approaches, i.e. damage due to a single test condition and cumulative damage due to a number of conditions. In addition, the methods of measuring and reporting damage to the toe are not the same as some researchers have counted only stones that were washed away from the toe; while others counted all the stones that have been displaced. Several formulas with different levels of success have been developed based on these studies. However, the scatter in the results is large and effects of some parameters are disregarded. The aims of this study are (a) to briefly review the abovementioned differences and exiting formulas, and (b) to develop a and physically sound formula for common design conditions, which considers the effect of all governing parameters. To achieve this, first a comprehensive data base from existing reliable studies was collected. Then nondimensional parameters which capture effects of governing parameters such as wave height, wave period, water depth, toe depth, toe width and foreshore slopes were deployed to develop a stability formula using physical reasoning and regression analysis. The new formula outperforms existing formulae for toe stability. The coefficient of variation of the formula was also determined to be used for probabilistic design applications. Finally, some design hints are provided for practitioners.

机译：脚趾设计是沿海工程师的重要任务，因为它确保了主盔甲层的稳定性，并防止了铠装斜面前的冲刷。已经进行了几个实验室实验以研究使用不同的测试方法的脚趾稳定性，即由于许多条件而导致的单一测试条件和累积损坏引起的损坏。此外，测量和报告脚趾损坏的方法与某些研究人员仅计算了从脚趾冲走的石头;虽然其他人依靠所有已经流离失所的石头。已经基于这些研究开发了几种具有不同成功水平的公式。然而，结果的散射很大，并且忽略了一些参数的效果。本研究的目的是（a）简要审查上述差异和退出公式，（b）为共同设计条件开发和物理声音公式，这考虑了所有管理参数的效果。为实现这一目标，首先收集来自现有可靠研究的全面数据库。然后，部署了一种捕获控制参数，例如波高，波浪周期，水深，脚趾深度，脚趾宽度和预留斜坡效果的效果，以使用物理学推理和回归分析来开发稳定性公式。新配方优于现有的脚趾稳定性公式。还确定公式的变异系数以用于概率设计应用。最后，为从业者提供了一些设计提示。

On the toe stability of rubble mound structures

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