DOI: 10.1002/2017JF004423
Scopus记录号: 2-s2.0-85040227380
论文题名: Damage-Based Time-Dependent Modeling of Paraglacial to Postglacial Progressive Failure of Large Rock Slopes
作者: Riva F. ; Agliardi F. ; Amitrano D. ; Crosta G.B.
刊名: Journal of Geophysical Research: Earth Surface
ISSN: 21699003
出版年: 2018
卷: 123, 期: 1 起始页码: 124
结束页码: 141
语种: 英语
英文关键词: creep
; damage
; deglaciation
; modeling
; rock slope
Scopus关键词: creep
; damage mechanics
; deglaciation
; Last Glacial Maximum
; permeability
; rock avalanche
; slope stability
; time dependent behavior
英文摘要: Large alpine rock slopes undergo long-term evolution in paraglacial to postglacial environments. Rock mass weakening and increased permeability associated with the progressive failure of deglaciated slopes promote the development of potentially catastrophic rockslides. We captured the entire life cycle of alpine slopes in one damage-based, time-dependent 2-D model of brittle creep, including deglaciation, damage-dependent fluid occurrence, and rock mass property upscaling. We applied the model to the Spriana rock slope (Central Alps), affected by long-term instability after Last Glacial Maximum and representing an active threat. We simulated the evolution of the slope from glaciated conditions to present day and calibrated the model using site investigation data and available temporal constraints. The model tracks the entire progressive failure path of the slope from deglaciation to rockslide development, without a priori assumptions on shear zone geometry and hydraulic conditions. Complete rockslide differentiation occurs through the transition from dilatant damage to a compacting basal shear zone, accounting for observed hydraulic barrier effects and perched aquifer formation. Our model investigates the mechanical role of deglaciation and damage-controlled fluid distribution in the development of alpine rockslides. The absolute simulated timing of rock slope instability development supports a very long “paraglacial” period of subcritical rock mass damage. After initial damage localization during the Lateglacial, rockslide nucleation initiates soon after the onset of Holocene, whereas full mechanical and hydraulic rockslide differentiation occurs during Mid-Holocene, supporting a key role of long-term damage in the reported occurrence of widespread rockslide clusters of these ages. ©2017. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114805
Appears in Collections: 气候减缓与适应
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作者单位: Department of Earth and Environmental Sciences, Università degli Studi di Milano–Bicocca, Milan, Italy; ISTerre, Université Grenoble Alpes, Grenoble, France
Recommended Citation:
Riva F.,Agliardi F.,Amitrano D.,et al. Damage-Based Time-Dependent Modeling of Paraglacial to Postglacial Progressive Failure of Large Rock Slopes[J]. Journal of Geophysical Research: Earth Surface,2018-01-01,123(1)