Granular column collapse: Analysis of grain-size effects

Is the Grain Size Distribution a Key Parameter for Explaining the Long Runout of Granular Avalanches?

“…The granular column collapse is a well established benchmark case for studying the mobility of granular flows (Lajeunesse et al, 2004;Lube et al, 2004;Mangeney-Castelnau et al, 2005;Staron & Hinch, 2005). On this configuration, the column aspect ratio is defined as a H R  0 0 / , where 0 E H is the initial column height (Cabrera & Estrada, 2019). In a previous publication we prove that grain size effects are found to have an influence on the collapse mobility, providing an explanation for notable differences between equivalent experimental and numerical setups (Cabrera & Estrada, 2019).…”

Wave Generation Across a Continuum of Landslide Conditions From the Collapse of Partially Submerged to Fully Submerged Granular Columns

“…Given the complex coupled motion between particles and fluid, previous studies have relied on physical experiments as tools to investigate landslide‐generated waves by extrapolating observations to analytical and numerical models for hazard assessment (Grilli et al., 2019; Mulligan et al., 2020). The benchmark case of the granular column collapse is often used for the study of landslide mobility and can provide insight into the speed and distal reach of the mass failure as a function of the ratio between the initial column height and the initial width (Cabrera & Estrada, 2019; Lajeunesse et al., 2004; Lube et al., 2004; Roche et al., 2008). The granular column setup provides a controlled release of a granular wedge, simplifying the intrinsic complexities leading to the triggering of a landslide (e.g., nonlinear soil behavior, complex sliding plane, and slide geometry).…”

Immersed granular collapse: from viscous to free-fall unsteady granular flows

“…Complexity has been increasingly added to the dry granular collapse to incorporate observable features in natural configurations, such as polydispersity or complex grain shape (Phillips et al 2006;Degaetano, Lacaze & Phillips 2013;Cabrera & Estrada 2019), erodible bottom (Crosta, Imposimato & Roddeman 2009;Mangeney et al 2010) or the influence of the surrounding fluid (Roche et al 2011;Rondon, Pouliquen & Aussillous 2011;Topin et al 2012;Bougouin & Lacaze 2018;Jing et al 2018Jing et al , 2019. In the latter situation, it has been highlighted that, as well as a, the initial volume fraction φ i (Rondon et al 2011) and Stokes number St (Bougouin & Lacaze 2018) can also play a significant role in the dynamics of collapse.…”

“…Complexity has been increasingly added to the dry granular collapse to incorporate observable features in natural configurations, such as polydispersity or complex grain shape (Phillips et al. 2006; Degaetano, Lacaze & Phillips 2013; Cabrera & Estrada 2019), erodible bottom (Crosta, Imposimato & Roddeman 2009; Mangeney et al. 2010) or the influence of the surrounding fluid (Roche et al.…”