气候变化领域集成服务门户(CCPortal): Modeling snow slab avalanches caused by weak-layer failure - Part 1: Slabs on compliant and collapsible weak layers

CCPortal

DOI	10.5194/tc-14-115-2020
	Modeling snow slab avalanches caused by weak-layer failure - Part 1: Slabs on compliant and collapsible weak layers
	Rosendahl P.L.; Weißgraeber P.
发表日期	2020
ISSN	19940416
EISSN	14
起始页码	115
结束页码	130
卷号	14 期号:1
英文摘要	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 the 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 considering 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 rate 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 (Rosendahl and Weißgraeber, 2020) 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 under https://github.com/2phi/weac (last access: 6 January 2020) (2phi, 2020). © 2020 Author(s).
学科领域	analytical method; avalanche; collapse; fracture toughness; nucleation; slab; slope angle; snowpack
语种	英语
scopus关键词	analytical method; avalanche; collapse; fracture toughness; nucleation; slab; slope angle; snowpack
来源期刊	The Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/118780
作者单位	2phi GbR, Tübingen, Germany; Department of Mechanical Engineering, Technische Universität Darmstadt, Darmstadt, Germany; Robert Bosch GmbH, Corporate Research and Advance Engineering, Renningen, Germany; ARENA2036 research campus, Universität Stuttgart, Stuttgart, Germany
推荐引用方式 GB/T 7714	Rosendahl P.L.,Weißgraeber P.. Modeling snow slab avalanches caused by weak-layer failure - Part 1: Slabs on compliant and collapsible weak layers[J],2020,14(1).
APA	Rosendahl P.L.,&Weißgraeber P..(2020).Modeling snow slab avalanches caused by weak-layer failure - Part 1: Slabs on compliant and collapsible weak layers.The Cryosphere,14(1).
MLA	Rosendahl P.L.,et al."Modeling snow slab avalanches caused by weak-layer failure - Part 1: Slabs on compliant and collapsible weak layers".The Cryosphere 14.1(2020).