DOI: 10.1016/j.epsl.2018.01.027
Scopus记录号: 2-s2.0-85044372018
论文题名: Do scaly clays control seismicity on faulted shale rocks?
作者: Orellana L.F. ; Scuderi M.M. ; Collettini C. ; Violay M.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 488 起始页码: 59
结束页码: 67
语种: 英语
英文关键词: anthropogenic seismicity
; deep geological repositories
; frictional behaviour of shales
; mirror-like surfaces
; scaly clays
Scopus关键词: Earthquakes
; Friction
; Geological repositories
; Radioactive wastes
; Radioactivity
; Shale
; Waste disposal
; anthropogenic seismicity
; Deep geological repository
; Deformation mechanism
; Experimental evidence
; Geological formation
; Mirror-like surface
; Nuclear waste storage
; Radioactive contamination
; Faulting
英文摘要: One of the major challenges regarding the disposal of radioactive waste in geological formations is to ensure isolation of radioactive contamination from the environment and the population. Shales are suitable candidates as geological barriers. However, the presence of tectonic faults within clay formations put the long-term safety of geological repositories into question. In this study, we carry out frictional experiments on intact samples of Opalinus Clay, i.e. the host rock for nuclear waste storage in Switzerland. We report experimental evidence suggesting that scaly clays form at low normal stress (≤20 MPa), at sub-seismic velocities (≤300 μm/s) and is related to pre-existing bedding planes with an ongoing process where frictional sliding is the controlling deformation mechanism. We have found that scaly clays show a velocity-weakening and -strengthening behaviour, low frictional strength, and poor re-strengthening over time, conditions required to allow the potential nucleation and propagation of earthquakes within the scaly clays portion of the formation. The strong similarities between the microstructures of natural and experimental scaly clays suggest important implications for the slip behaviour of shallow faults in shales. If natural and anthropogenic perturbations modify the stress conditions of the fault zone, earthquakes might have the potential to nucleate within zones of scaly clays controlling the seismicity of the clay-rich tectonic system, thus, potentially compromising the long-term safeness of geological repositories situated in shales. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109986
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
There are no files associated with this item.
作者单位: Laboratory of Experimental Rock Mechanics (LEMR), ENAC, EPFL, Station 18, Lausanne, CH-1015, Switzerland; Dipartimento di Scienze della Terra, Università degli Studi La Sapienza, Piazzale Aldo Moro, Rome, 00185, Italy; Istituto Nazionale di Geofisica e Vulcanologia (INGV), Via de Vigna Murate 605, Rome, 00143, Italy
Recommended Citation:
Orellana L.F.,Scuderi M.M.,Collettini C.,et al. Do scaly clays control seismicity on faulted shale rocks?[J]. Earth and Planetary Science Letters,2018-01-01,488