Rosendahl, Philipp Laurens ; Weißgraeber, Philipp (2020)
Modeling snow slab avalanches caused by weak-layer failure – Part 1: Slabs on compliant and collapsible weak layers.
In: The Cryosphere, 14 (1)
doi: 10.5194/tc-14-115-2020
Artikel, Bibliographie
Dies ist die neueste Version dieses Eintrags.
Kurzbeschreibung (Abstract)
Dry-snow slab avalanche release is preceded by a fracture process within the snowpack. Recognizing weak layer collapse as an integral part of the fracture process is crucial and explains phenomena such as whumpf sounds and remote triggering of avalanches from low-angle terrain. In this two-part work we propose a novel closed-form analytical model for a snowpack under skier loading and a mixed-mode failure criterion for nucleation of weak layer failure. In the first part of this two-part series we introduce a closed-form analytical model of a snowpack accounting for the deformable layer. Despite the importance of persistent weak layers for slab avalanche release, no simple analytical model accounting for weak layer deformations is available. The proposed model provides deformations of the snow slab, weak layer stresses and energy release rates of cracks within the weak layer. It generally applies to skier-loaded slopes as well as stability tests such as the propagation saw test. A validation with a numerical reference model shows very good agreement of the stress and energy release rates results in several parametric studies including analyses of the bridging effect and slope angle dependence. The proposed model is used to analyze 93 propagation saw tests. Computed weak layer fracture toughness values are physically meaningful and in excellent agreement with finite element analyses. In the second part of the series we make use of the present mechanical model to establish a novel failure criterion crack nucleation in weak layers. The code used for the analyses in both parts is publicly available.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2020 |
| Autor(en): | Rosendahl, Philipp Laurens ; Weißgraeber, Philipp |
| Art des Eintrags: | Bibliographie |
| Titel: | Modeling snow slab avalanches caused by weak-layer failure – Part 1: Slabs on compliant and collapsible weak layers |
| Sprache: | Englisch |
| Publikationsjahr: | Januar 2020 |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | The Cryosphere |
| Jahrgang/Volume einer Zeitschrift: | 14 |
| (Heft-)Nummer: | 1 |
| DOI: | 10.5194/tc-14-115-2020 |
| Zugehörige Links: | |
| Kurzbeschreibung (Abstract): | Dry-snow slab avalanche release is preceded by a fracture process within the snowpack. Recognizing weak layer collapse as an integral part of the fracture process is crucial and explains phenomena such as whumpf sounds and remote triggering of avalanches from low-angle terrain. In this two-part work we propose a novel closed-form analytical model for a snowpack under skier loading and a mixed-mode failure criterion for nucleation of weak layer failure. In the first part of this two-part series we introduce a closed-form analytical model of a snowpack accounting for the deformable layer. Despite the importance of persistent weak layers for slab avalanche release, no simple analytical model accounting for weak layer deformations is available. The proposed model provides deformations of the snow slab, weak layer stresses and energy release rates of cracks within the weak layer. It generally applies to skier-loaded slopes as well as stability tests such as the propagation saw test. A validation with a numerical reference model shows very good agreement of the stress and energy release rates results in several parametric studies including analyses of the bridging effect and slope angle dependence. The proposed model is used to analyze 93 propagation saw tests. Computed weak layer fracture toughness values are physically meaningful and in excellent agreement with finite element analyses. In the second part of the series we make use of the present mechanical model to establish a novel failure criterion crack nucleation in weak layers. The code used for the analyses in both parts is publicly available. |
| Fachbereich(e)/-gebiet(e): | 16 Fachbereich Maschinenbau 16 Fachbereich Maschinenbau > Fachgebiet für Strukturmechanik (FSM) |
| Hinterlegungsdatum: | 13 Sep 2019 10:11 |
| Letzte Änderung: | 03 Jul 2024 02:40 |
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| Suche nach Titel in: | TUfind oder in Google |
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Modeling snow slab avalanches caused by weak-layer failure – Part 1: Slabs on compliant and collapsible weak layers. (deposited 29 Mär 2020 19:57)
- Modeling snow slab avalanches caused by weak-layer failure – Part 1: Slabs on compliant and collapsible weak layers. (deposited 13 Sep 2019 10:11) [Gegenwärtig angezeigt]
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