Estimating the impact force generated by granular flow on a rigid obstruction |
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| Authors: | Shuji Moriguchi Ronaldo I Borja Atsushi Yashima Kazuhide Sawada |
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| Institution: | (1) Department of Civil and Environmental Engineering, Stanford University, Stanford, CA 94305, USA;(2) Department of Civil Engineering, Gifu University, Gifu, Japan;(3) River Basin Research Center, Gifu University, Gifu, Japan; |
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| Abstract: | Flowing sediments such as debris and liquefied soils could exert a tremendous amount of force as they impact objects along
their paths. The total impact force generally varies with slope angle, velocity at impact, and thickness of the flowing sediment.
Estimation of the impact force of flowing sediments against protective measures such as earth retaining structures is an important
factor for risk assessment. In this paper, we conduct small-scale laboratory physical modeling of sand flow at different slopes
and measure the impact force exerted by this material on a fixed rigid wall. We also conduct numerical simulations in the
Eulerian framework using computational fluid dynamics algorithms to analyze and reproduce the laboratory test results. The
numerical simulations take into consideration the overtopping of the wall with sand, which influenced the measured impact
force–time history responses. In addition, the numerical simulations are shown to capture accurately the change of the impact
force with slope angle. Finally, the modeling approach conducted in this study is used to estimate the quasi-static force
generated by the sediment as it comes to rest on the wall following impact. |
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