| DOI: | 10.1002/2014GL060848
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| 论文题名: | Precursors to the shear failure of rock discontinuities |
| 作者: | Hedayat A.; Pyrak-Nolte L.J.; Bobet A.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9898
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| EISSN: | 1944-9629
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| 出版年: | 2014
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| 卷: | 41, 期:15 | | 起始页码: | 5467
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| 结束页码: | 5475
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| 语种: | 英语
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| 英文关键词: | direct shear experiments
; rock discontinuity
; shear specific stiffness
; ultrasonic precursors
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| Scopus关键词: | Friction
; Geophysics
; Shear waves
; Shearing
; Stiffness
; Shearing machines
; Direct shear
; Direct shear apparatus
; Geophysical monitoring
; Peak shear strength
; Potential failures
; Rock discontinuity
; Specific stiffness
; Ultrasonic monitoring
; Shearing process
; Shearing rates
; Shearing machines
; Shear flow
; compression
; discontinuity
; failure analysis
; geophysical survey
; shear strength
; stiffness
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| 英文摘要: | Active geophysical monitoring of potential failure along mechanical discontinuities in rock requires identification of precursory signatures to failure in geophysical signals. Active ultrasonic monitoring of shear failure along frictional discontinuities was performed to determine the signatures of potential failure. An instrumented direct shear apparatus was used to apply a constant shearing rate to a discontinuity that was held under a constant normal stress. Transmitted and reflected compressional and shear waves were recorded during the shearing process. Ultrasonic precursors were identified as distinct maxima in the amplitude of transmitted shear waves as well as minima in the amplitude of reflected shear waves that occurred well before the peak shear strength of a frictional discontinuity. The precursors are linked to changes in the local shear specific stiffness along the discontinuity, while the discontinuity's macroscopic shear strength continues to increase prior to failure. Key Points Precursors in shear wave amplitudes occur prior to slip along a discontinuity Precursors are linked to changes in the stiffness of a discontinuity © 2014. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84905621752&doi=10.1002%2f2014GL060848&partnerID=40&md5=bf29f80a0b13cef27affc79fc337a750
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/7162
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Department of Engineering, Indiana University, Purdue University, Fort Wayne, IN, United States
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| Recommended Citation: | |
Hedayat A.,Pyrak-Nolte L.J.,Bobet A.. Precursors to the shear failure of rock discontinuities[J]. Geophysical Research Letters,2014-01-01,41(15).
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