Impact dynamics of granular debris flows based on a small-scale physical model

Scheidl, Christian; Friedl, Caroline; Reider, Lukas; Wernhart, Susanna; Fuchs, Anna-Lisa; Dankwerth, Anna Lisa; Nagl, Georg; Kaitna, Roland; Proske, Dirk (2023). Impact dynamics of granular debris flows based on a small-scale physical model Acta Geotechnica, 19(6), pp. 3979-3997. Springer 10.1007/s11440-023-02116-8

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The peak pressure of a granular debris flow at low Froude conditions can be calculated with knowledge of the stress anisotropy and the bulk density as well as the run-up height at impact. Based on a small-scale physical model, measurements of stress anisotropy and flow density values at impact are presented and applied to existing run-up prediction models, and further compared with back-calculated run-up coefficients from measured maximum impact pressures. For this purpose, we conducted 17 experiments with impact measurements and six experiments without impact measurements at Froude numbers, ranging from 0.84 to 2.41. Our results indicate that run-up heights are best reproduced by predictive models, either based on energy or mass and moment conservation, when anisotropic stress conditions, found in this study to range from 1.2 to 5.0, and bulk density variations due to impact, ranging in this study from 0.8 to 2.3, are considered. The influence of stress anisotropy and density variation on the run-up prediction differs, depending on the modelling approach. For the calculation of run-up heights based on the energy conservation concept, the influence of stress anisotropy becomes more significant with increasing Froude number, whereas for models based on mass and momentum conservation, bulk density variations have a greater influence on the estimation of the potential run-up.

Item Type:

Journal Article (Original Article)

Division/Institute:

School of Architecture, Wood and Civil Engineering
School of Architecture, Wood and Civil Engineering > AHB Teaching
School of Architecture, Wood and Civil Engineering > Institute for Urban Development and Infrastructure > Geotechnics and Natural Phenomena
School of Architecture, Wood and Civil Engineering > Institute for Urban Development and Infrastructure > Transport Infrastructure
School of Architecture, Wood and Civil Engineering > Institute for Infrastructure and Environment IIU > Geotechnics and Special Civil Engineering group FGGS
School of Architecture, Wood and Civil Engineering > Institut for Building Materials and Biobased Products IBBM > Mobility and Transport Infrastructure group FGMV

Name:

Scheidl, Christian;
Friedl, Caroline;
Reider, Lukas;
Wernhart, Susanna;
Fuchs, Anna-Lisa;
Dankwerth, Anna Lisa;
Nagl, Georg;
Kaitna, Roland and
Proske, Dirk

Subjects:

T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TC Hydraulic engineering. Ocean engineering

ISSN:

1861-1125

Publisher:

Springer

Language:

English

Submitter:

Dirk Proske

Date Deposited:

01 Dec 2023 12:13

Last Modified:

23 Jun 2024 01:38

Publisher DOI:

10.1007/s11440-023-02116-8

ARBOR DOI:

10.24451/arbor.20476

URI:

https://arbor.bfh.ch/id/eprint/20476

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