用冰柱模型模拟扩展锯试验中弱雪层断裂

IF 1.6 4区 地球科学 Q4 ENVIRONMENTAL SCIENCES
Agraj Upadhyay, Rajneesh Sharma, P. Mahajan
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引用次数: 0

摘要

断层在弱雪层中的萌生和扩展是板状雪崩形成过程的两个主要过程。本研究提出了一个弱雪层的模型,并研究了裂缝的扩展过程。弱雪层被概念化为夹在两层强雪之间的冰柱。强层被建模为线弹性,而冰则被表征为破坏性的弹塑性材料。模型软弱层的有效力学性能通过有限元分析进行了检验,与文献中报道的雪的性能接近。该模型被用于数值传播锯试验(PSTs),以研究弱雪层中的裂缝传播过程。PST模拟中的临界裂纹长度(CCL)和裂纹扩展速度(FPS)是通过跟踪裂纹尖端获得的,与之前报道的结果非常一致。通过PST模拟中的能量变化分析,深入了解了弱雪层中裂缝的传播过程,并表明动态裂缝传播过程中的FPS随顶板的弹性模量、弱雪层的断裂能量和上覆板的惯性而变化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Modeling weak snow layer fracture in propagation saw test using an ice column model
ABSTRACT Fracture initiation and propagation in a weak snow layer are two primary processes of the slab avalanche formation process. This study proposes a model for the weak snow layer and investigates the fracture propagation process. The weak snow layer is conceptualized as columns of ice sandwiched between two strong layers of snow. The strong layers are modeled as linear elastic, whereas the ice is characterized as a damaging elastoplastic material. The effective mechanical properties of the model weak layer are examined using finite element analysis and are close to the snow properties reported in the literature. This model is used in numerical propagation saw tests (PSTs) to investigate the fracture propagation process in the weak snow layer. Critical crack length (CCL) and fracture propagation speed (FPS) in PST simulations are obtained by tracking the crack tip and are in good agreement with the previously reported results. An insight into the fracture propagation process in the weak snow layer is presented through energy variation analysis in PST simulations and shown that the FPS during dynamic fracture propagation varies with the top slab’s elastic modulus, the weak layer’s fracture energy, and inertia of the overlying slab.
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来源期刊
CiteScore
3.00
自引率
5.00%
发文量
37
审稿时长
7 months
期刊介绍: The mission of Arctic, Antarctic, and Alpine Research (AAAR) is to advance understanding of cold region environments by publishing original scientific research from past, present and future high-latitude and mountain regions. Rapid environmental change occurring in cold regions today highlights the global importance of this research. AAAR publishes peer-reviewed interdisciplinary papers including original research papers, short communications and review articles. Many of these papers synthesize a variety of disciplines including ecology, climatology, geomorphology, glaciology, hydrology, paleoceanography, biogeochemistry, and social science. Papers may be uni- or multidisciplinary but should have interdisciplinary appeal. Special thematic issues and proceedings are encouraged. The journal receives contributions from a diverse group of international authors from academia, government agencies, and land managers. In addition the journal publishes opinion pieces, book reviews and in memoria. AAAR is associated with the Institute of Arctic and Alpine Research (INSTAAR) the oldest active research institute at the University of Colorado Boulder.
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