DOI: 10.1002/grl.50384
论文题名: Environmental controls of frost cracking revealed through in situ acoustic emission measurements in steep bedrock
作者: Girard L. ; Gruber S. ; Weber S. ; Beutel J.
刊名: Geophysical Research Letters
ISSN: 0094-9129
EISSN: 1944-8860
出版年: 2013
卷: 40, 期: 9 起始页码: 1748
结束页码: 1753
语种: 英语
英文关键词: acoustic emission
; permafrost
; rock mechanics
; weathering
Scopus关键词: Acoustic emission measurement
; Environmental control
; Freeze-thaw cycling
; Hydrological properties
; In-situ measurement
; Liquid water content
; Mechanical weatherings
; Natural conditions
; Acoustic emission testing
; Acoustic emissions
; Cracks
; Freezing
; Liquids
; Permafrost
; Rock mechanics
; Rocks
; Weathering
; acoustic emission
; alpine environment
; bedrock
; data set
; environmental conditions
; freeze-thaw cycle
; freezing
; frost
; in situ measurement
; moisture content
; permafrost
; rock mechanics
; temperature effect
; weathering
英文摘要: Frost cracking, the breakdown of rock by freezing, is one of the most important mechanical weathering processes acting on Earth's surface. Insights on the mechanisms driving frost cracking stem mainly from laboratory and theoretical studies. Transferring insights from such studies to natural conditions, involving jointed bedrock and heterogeneous thermal and hydrological properties, is a major challenge. We address this problem with simultaneous in situ measurements of acoustic emissions, used as proxy of rock damage, and rock temperature/moisture content. The 1 year data set acquired in an Alpine rock wall shows that (1) liquid water content has an important impact on freezing-induced rock damage, (2) sustained freezing can yield much stronger damage than repeated freeze-thaw cycling, and (3) that frost cracking occurs over the full range of temperatures measured extending from 0 down to -15°C. These new measurements yield a slightly different picture than previous field studies where ice segregation appears to play an important role. Key PointsRock liquid water content has an important impact on the freezing-induced damageSustained freezing can yield stronger damage than repeated freeze-thaw cyclingFrost cracking occurs on a wide range of temperatures extending from 0 to -15C ©2013. American Geophysical Union. All Rights Reserved.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84879119383&doi=10.1002%2fgrl.50384&partnerID=40&md5=efafe4f75370e017a1ae8d1079d5f626
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6393
Appears in Collections: 气候减缓与适应
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作者单位: Glaciology and Geomorphodynamics, Department of Geography, University of Zurich, Switzerland
Recommended Citation:
Girard L.,Gruber S.,Weber S.,et al. Environmental controls of frost cracking revealed through in situ acoustic emission measurements in steep bedrock[J]. Geophysical Research Letters,2013-01-01,40(9).