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Mechanics of gravitational spreading of steep-sided ridges («sackung»)

Savage, William Z. / Varnes, David J.

Abstract Large-scale gravitational spreading of steep-sided ridges characterized by linear fissures, trenches, and uphill-facing scarps high on the sides and tops of ridges are known worldwide. Such spreading, termed sackung, is commonly attributed to pervasive plastic deformation of a rock mass, and is here analyzed as such. Beginning with a previously developed exact elastic solution for gravity-induced stresses in a symmetric ridge, stresses calculated from the exact solution are used in the Coulomb failure criterion to determine the extent of ridge failure under self-weight. Finally, when the regions of failure are established, a plastic flow solution is applied to predict the location of and sense of movement on upward-facing scarps near ridge crests and other features common in sackung.

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Mechanics of gravitational spreading of steep-sided ridges («sackung»)

Savage, William Z. / Varnes, David J.

Abstract Large-scale gravitational spreading of steep-sided ridges characterized by linear fissures, trenches, and uphill-facing scarps high on the sides and tops of ridges are known worldwide. Such spreading, termed sackung, is commonly attributed to pervasive plastic deformation of a rock mass, and is here analyzed as such. Beginning with a previously developed exact elastic solution for gravity-induced stresses in a symmetric ridge, stresses calculated from the exact solution are used in the Coulomb failure criterion to determine the extent of ridge failure under self-weight. Finally, when the regions of failure are established, a plastic flow solution is applied to predict the location of and sense of movement on upward-facing scarps near ridge crests and other features common in sackung.

Mechanics of gravitational spreading of steep-sided ridges («sackung»)

Savage, William Z. / Varnes, David J.

Abstract Large-scale gravitational spreading of steep-sided ridges characterized by linear fissures, trenches, and uphill-facing scarps high on the sides and tops of ridges are known worldwide. Such spreading, termed sackung, is commonly attributed to pervasive plastic deformation of a rock mass, and is here analyzed as such. Beginning with a previously developed exact elastic solution for gravity-induced stresses in a symmetric ridge, stresses calculated from the exact solution are used in the Coulomb failure criterion to determine the extent of ridge failure under self-weight. Finally, when the regions of failure are established, a plastic flow solution is applied to predict the location of and sense of movement on upward-facing scarps near ridge crests and other features common in sackung.

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Title:

Mechanics of gravitational spreading of steep-sided ridges («sackung»)

Contributors:

Savage, William Z. (author) / Varnes, David J. (author)

Published in:

Bulletin of the International Association of Engineering Geology - Bulletin de l'Association Internationale de Géologie de l'Ingénieur ; 35

Publication date:

1987

ISSN:

DOI:

https://doi.org/10.1007/BF02590474

Type of media:

Article (Journal)

Type of material:

Print

Language:

English

Keywords:

Coulomb Failure Criterion , Rupture Surface , Ridge Crest , Pore Pressure , Stream Erosion

Classification:

BKL: 38.58 Geomechanik / 56.20 Ingenieurgeologie, Bodenmechanik
Local classification TIB: 050/6545

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