论文标题
Ski触发的雪板雪崩的3D弹性模拟
3D elastoplastic simulation of ski-triggered snow slab avalanches
论文作者
论文摘要
干雪雪崩的稳定性在很大程度上取决于弱层上方的雪板之间的相互作用，如这项工作所示，是滑雪者诱导的负载。该诱导的负载导致平板上的额外应力场，最终触发了雪崩。我在弹性塑料结构域中介绍了3D有限元模拟的结果。弱层的塑性变形遵循Mohr-Coulomb-Cap模型，该模型提供了更现实的模型作为纯弹性方法。我研究了弱层顶部的应力场如何变化，如果一个人滑雪或平行于斜坡。分层的雪板改变了弱层顶部的应力并研究了这些变化，我模拟了两个不同的层状板。一个仅包含软层，以研究弱层如何受到滑雪诱导的应力的影响，而另一个坚硬的层层来检查由硬层引起的桥梁效应。雪板中的坚硬层形成了一种桥梁，该桥在较大的横向距离上散布了诱导的应力，同时降低了桥下层的应力。此外，我显示了塑性变形与临界裂纹长度之间的可能连接。
The stability of dry-snow avalanches is strongly dependent on the interaction between the snow slab above a weak-layer and, as presented in this work, the skier induced load. This induced load causes an additional stress field on the slab which eventually triggers an avalanche. I present the results of 3D finite element simulations in an elastoplastic domain. The plastic deformation of the weak-layer follows the Mohr-Coulomb-Cap model which provides a more realistic model as a pure elastic approach. I investigate how the stress field on top of the weak-layer changes if one is skiing down-slope or parallel to the slope. A layered snow slab changes the stress on top of the weak-layer and to investigate these changes I simulated two different representative layered slabs. One containing only soft layers to investigate how the weak layer is affected by the ski induced stress and the other hard-soft-hard layer to examine bridge effects caused by the hard layers. A hard layer in the snow slab forms a sort of bridge which spreads the induced stress over a larger lateral distance, at the same time decreasing the stress to the layers below the bridge. Furthermore, I show a possible connection between the plastic deformation and the critical crack length.
