Hydraulic performance, wave loading and response of PBA revetments and their foundations

Abstract

Polyurethane bonded aggregate (PBA) revetments are highly porous structures made of crushed stones durably and elastically bonded by polyurethane (PU). Despite their advantages compared with conventional revetments and the experience available from more than 25 pilot projects, design formulae to predict their hydraulic performance, wave loading and response are still lacking. Therefore, the paper addresses the analysis of large-scale tests performed in the Large Wave Flume (GWK) of Hanover/Germany. The study aims at improving the understanding of the processes involved in the interaction between wave, revetment and foundation and at developing the missing design formulae for a broad range of wave conditions. The analysis of an observed failure due to transient soil liquefaction under regular waves is also described.Les revêtements PBA (polyurethane bonded aggregate) sont des structures très poreuses composées d'agrégats liés durablement et élastiquement par du Polyurethane (PU). Malgré les avantages de ce type de revêtement et l'expérience de plus de 25 projets pilotes, il n'existe toujours pas des formules de dimensionnement pour le calcul de leur performance hydraulique, des efforts de houle ainsi que de leur réponse à ces efforts. C'est pourquoi cette étude est consacrée à l'analyse des essais à grande échelle dans le Grand Canal à Houle (GWK) de Hanovre/Allemagne. Ces essais visent à améliorer les connaissances relatives aux processus liés à l'interaction entre la houle, le revêtement et sa fondation et à développer les formules de dimensionnement pour une large gamme de conditions de houle. L'analyse d'un cas de rupture cause en houles régulières par une liquéfaction transiente est aussi inclue.

Wave Run-Up Observations on Revetments With Different Porosities

“…[ ] 2% 0 1.5 1.65 with a maximum of 4.0 A similar plot like Figure 13 and the same results were already presented in Oumeraci et al (2010Oumeraci et al ( & 2012, however in a slightly different way. Therefore, the results have been shown and discussed again in order to be consistent with the present approach and for direct comparison with the corresponding results based on the new automated analysis of the video data by timestack image processing, which are discussed in the following.…”

External and Internal Wave Set-Up at Porous Pba Revetments on a Sand Foundation

“…The results on the hydraulic performance, the wave loading and the response of the soil foundation have already been reported in many reports and papers. While most of the results are described in a detailed internal report (Oumeraci et al 2010b) and are summarised in Oumeraci et al 2012; part of the findings are published in Oumeraci et al (2010a) (reflection performance, wave run-up and run-down and failure of model alternative A) and Ludwigs et al (2010) (loads on and beneath the revetment) as well as Ludwigs & Oumeraci (2011) (load -displacement -pore pressure relations).…”

Editorial

“…The paper, by Oumeraci, Staal, Pförtner, and Ludwigs (2012), related to the third theme is dedicated to large-scale innovative experimentations in the Large Wave Flume (GWK) of Hanover/Germany. Tests are run on polyurethane bonded aggregate (PBA) coatings, which are highly porous and sustainable structures made with crushed stones and elastically bonded by polyurethane (PU).…”