Author(s): Leif Lia; Fjola G. Sigtryggsdottir; Ganesh H. R. Ravindra

Linked Author(s): Leif Lia, Fjola Gudrun Sigtryggsdottir

Keywords: Buckling; Flow–structure interactions; Hydraulic models; Hydraulic structure design & Management; Laboratory studies; Riprap stability

Abstract: A novel approach quantitatively describing two-dimensional displacements of placed riprap stones exposed to overtopping flows is developed and validated, coupling experimental data with Euler’s buckling theory for columns. Past studies investigating the failure mechanisms of placed ripraps with toe support have analysed unidirectional displacements of riprap stones parallel to the slope. 2D description of this process is currently not available in the literature. To address this issue, datasets obtained from a physical modelling investigation conducted on model ripraps constructed with angular stones on a slope of 1:1.5 (vertical : horizontal) were further analysed along with additional experimental data. Investigation results demonstrated that placed ripraps supported at the toe underwent progressive deformations in 2D when exposed to overtopping flows. The deformation behaviour closely resembled buckling of a slender-long column pinned at one end and free at the other and this ultimately led to total riprap failure at the upstream section of the riprap.

DOI: https://doi.org/10.1080/00221686.2020.1744745

Year: 2021