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

被引:5
作者
Scheidl, Christian [1 ]
Friedl, Caroline [1 ]
Reider, Lukas [1 ]
Wernhart, Susanna [1 ]
Fuchs, Anna-Lisa [1 ]
Dankwerth, Anna Lisa [1 ]
Nagl, Georg [1 ]
Kaitna, Roland [1 ]
Proske, Dirk [1 ,2 ]
机构
[1] Univ Nat Resources & Life Sci, Inst Mt Risk Engn IAN, Peter Jordan Str 82, A-1190 Vienna, Austria
[2] Berner Fachhsch, Sch Architecture Wood & Civil Engn, Fachbereich Bauingenieurwesen, Pestalozzistr 20, CH-3401 Bern, Switzerland
基金
奥地利科学基金会;
关键词
Bulk density at impact; Debris-flow impact; Physical modelling; Run-up height; Stress anisotropy; PRESSURE; MECHANISMS; LANDSLIDE; BEHAVIOR; TORRENT; DESIGN; RUNOUT; RUNUP; MASS;
D O I
10.1007/s11440-023-02116-8
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
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.
引用
收藏
页码:3979 / 3997
页数:19
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