Stability of wide-graded rubble mounds

The Delft University of Technology provided the laboratory facilities to carry out physical model tests on a wide graded rubble mound structure representative of the core of a breakwater. The parameter D85/D15, describing the stone-size gradation of the construction material, was varied between the values 2.71 and 17.7, and two different seaward slopes of the model structure were also tested. The reshaped cross-shore profiles measured during the tests showed how if the grading increases the stability of the structure is reduced. In conclusion, this research points out how the formulas provided by the technical literature are not reliable in representing the effects of a very wide stone-size gradation in the stability of a rubble mound structure. Physical model tests proved to be a suited way to investigate these effects, as the nature of the phenomena who play a role in the stability does not allow a simple analytical representation. The tests carried out within the present study lead to the implementation of a numerical model of practical use for engineers and contractors: further investigations through laboratory tests are recommended to validate and extend the findings of this study. Another proposed direction for further research is the comparison between the results of physical model tests and the output of numerical models.代尔夫特理工大学（Delft University of Technology）提供了实验室设施，用于开展针对具有防波堤核心特征的宽级配抛石堤结构的物理模型试验。表征建筑材料粒径级配的参数D85/D15，其取值范围设置为2.71至17.7，同时本试验还针对模型结构的两种不同海侧坡度开展了相关测试。试验中测得的重塑岸向剖面结果表明，粒径级配程度越高，结构的稳定性越低。综上，本研究指出，现有技术文献中给出的相关公式，在表征极宽粒径级配对抛石堤结构稳定性的影响时，并不具备可靠性。物理模型试验被证实是探究此类影响的适宜手段，因为影响结构稳定性的各类物理现象的本质，难以通过简单的解析方法进行表征。本研究开展的试验推动了一款可供工程师与承包商使用的实用数值模型的落地，建议后续通过室内试验进一步验证并拓展本研究的结论。另一项后续研究方向建议，是将物理模型试验的结果与数值模型的输出结果进行对比分析。

搜集汇总

背景与挑战

背景概述

该数据集聚焦于宽级配抛石堤的稳定性研究，通过物理模型测试探讨石料级配和坡度对结构稳定性的影响。研究发现级配增加会降低稳定性，并指出现有工程公式在描述宽级配效应时存在局限性，为工程师和承包商提供了实用数值模型基础。数据集包含实验数据，支持土木工程和水利工程领域的进一步研究。