DOI: 10.1002/2015GL067544
论文题名: The effective stress law at a brittle-plastic transition with a halite gouge layer
作者: Noda H. ; Takahashi M.
刊名: Geophysical Research Letters
ISSN: 0094-9297
EISSN: 1944-9028
出版年: 2016
卷: 43, 期: 5 起始页码: 1966
结束页码: 1972
语种: 英语
英文关键词: analog experiment
; brittle-plastic transition
; earthquake
; effective stress law
; friction experiment
; pore pressure
Scopus关键词: Chloride minerals
; Earthquakes
; Friction
; Pore pressure
; Shear flow
; Brittle-plastic transition
; Effective normal stress
; Effective stress
; Friction experiments
; Functional dependency
; Mylonitic shear zone
; Smooth transitions
; Steady state strength
; Sodium chloride
英文摘要: We investigated the effect of pore pressure Pf near the brittle-plastic transition (BPT) for a halite (NaCl) shear zone. Our series of precut friction experiments with a gas-medium apparatus with temperature T ≤ 200°C, confining gas pressure Pc ≤ 150 MPa and Pf ≤ 140 MPa, revealed that a tanh connection between the brittle and plastic regimes works well even at elevated Pf, with a coefficient for Pf in an effective stress law α being unity. Plastic deformation around the real contacts independent of the mean stress results in α = 1 regardless of the ratio of the real contact area Ar/A. The functional dependency of the shear strength on the effective normal stress may deviate from a linear dependency with increasing Ar/A. The present findings support a smooth transition in a hypothetical steady state strength profile around a BPT, providing new insights in geologically obtained paleostress data in exhumed mylonitic shear zones. © 2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84960517420&doi=10.1002%2f2015GL067544&partnerID=40&md5=258804c9f8704b2a1254f5725e2125a5
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10260
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Mathematical Science and Advanced Technology, Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan
Recommended Citation:
Noda H.,Takahashi M.. The effective stress law at a brittle-plastic transition with a halite gouge layer[J]. Geophysical Research Letters,2016-01-01,43(5).