The Loading Rate Dependency of Sand Cushion Focused on Stress Wave Velocity Using Dem

Naito, Naoto; Konno, Hisashi; Ushiwatari, Yuji; Suzuki, Koichi; Kawase, Ryoji

doi:10.2208/jscejam.71.i_557

Cited by 1 publication

(2 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 8 shows the simulation results. The solid lines represent the relationship between the loading force and the penetration depth at a constant loading velocity [13]. The loading force rapidly increased immediately after collision and then remained almost constant.…”

Section: Results Of Dem Simulationmentioning

confidence: 99%

“…[3,4,19,20]. Our research group has previously examined the impact force propagation in a granular layer [10,13]. We have shown that the discrete element method (DEM) [5] can reproduce not only the impact force but also the change in the density of a cushioning material after impact, which is observed in a large-scale falling-weight impact experiment [14].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Loading rate dependence of granular cushion under rockfall impact and proposal of an analytical model for impact force estimation

et al. 2022

Self Cite

View full text Add to dashboard Cite

The cushioning behaviour of granular materials, such as sand and gravel, has been studied for the rational design and performance evaluation of a rock shed intended for rockfall protection. The shape of the collision surface of a falling mass strongly affects the impact force waveform of the falling mass. However, the control factors for generating impact force waveform have not been fully clarified. Previous studies have shown that the maximum transmitted impact force acting on the top plate of a rock shed through a cushioning material depends not only on the maximum impact force acting on the falling mass but also on its duration. To accurately predict the maximum transmitted impact force acting on a structure, understanding the generation mechanism of the impact force waveform acting on the falling mass is necessary. These control factors were investigated through the two-dimensional (2D) discrete element method (DEM) analysis. It was shown that the mean principal stress of particles around a falling mass increased with the loading velocity of the falling mass. Based on this result, an analytical model for estimation the impact force waveform of the falling mass was proposed. The validity of the proposed method and the control factors estimated via simulations was confirmed by comparing the results obtained by the proposed method with 2D DEM simulation results and experimental results. This study contributes to the elucidation of the deformation mechanism of soil under high-speed loading and development of rational countermeasures considering the deformation behaviour of a sand cushion.

show abstract

Section: Results Of Dem Simulationmentioning

confidence: 99%