DOI: 10.1002/2013GL058526
论文题名: Discrete blasts in granular material yield two-stage process of cavitation and granular fountaining
作者: Andrews R.G. ; White J.D.L. ; Dürig T. ; Zimanowski B.
刊名: Geophysical Research Letters
ISSN: 0094-10450
EISSN: 1944-10181
出版年: 2014
卷: 41, 期: 2 起始页码: 422
结束页码: 428
语种: 英语
英文关键词: analog experiments
; cavitation
; discrete eruptions
; dynamic segregation
; granular fountains
; subterranean explosions
Scopus关键词: Cavitation
; Debris
; Experiments
; Fountains
; Granular materials
; Detonation experiment
; discrete eruptions
; Experimental analysis
; Initial pressure
; Nuclear testing
; Over-pressures
; Power law decay
; Two-stage process
; Explosives
; analog model
; cavitation
; debris avalanche
; diatreme
; experimental study
; granular medium
; nuclear weapons testing
; open space
; overpressure
; subterranean environment
英文摘要: A discrete blast within granular material, such as a single subterranean explosion within a debris-filled diatreme structure, is typically considered to produce a single uprush of material. Our experiments demonstrate that apparent "debris jet deposits" can be formed by a two-stage process of cavitation and subsequent granular fountaining. Bench-scale experiments reported here demonstrate that for a range of overpressures and depths, individual, discrete, buried gas blasts open space and expel particles from the blast site in two largely decoupled stages. Expanding gas initially pierces material nearest the blast source to open a cavity above it; then a fountain of grains rises from the source into the cavity. This staged motion dynamically segregates source grains from host-material grains, and the rates of cavity opening versus fountain rise show a power law decay relationship with initial pressure. Our experimental analysis has implications for maar-diatreme systems, field-scale detonation experiments, and underground nuclear testing. ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84893178352&doi=10.1002%2f2013GL058526&partnerID=40&md5=f18c1d450b64951ba19d48e0b31eb3b5
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7714
Appears in Collections: 气候减缓与适应
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作者单位: Department of Geology, University of Otago, Dunedin, New Zealand
Recommended Citation:
Andrews R.G.,White J.D.L.,Dürig T.,et al. Discrete blasts in granular material yield two-stage process of cavitation and granular fountaining[J]. Geophysical Research Letters,2014-01-01,41(2).