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| Titel |
Prediction of slope instabilities due to deep-seated gravitational creep |
| VerfasserIn |
E. Brückl, M. Parotidis |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 5, no. 2 ; Nr. 5, no. 2 (2005-01-31), S.155-172 |
| Datensatznummer |
250002328
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| Publikation (Nr.) |
 copernicus.org/nhess-5-155-2005.pdf |
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| Zusammenfassung |
| Deep-seated gravitational creep in rock slopes, rock-flow or sackung is a
special category of mass-movement, in which long-lasting small-scale
movements prevail. The prime causes of these mass movements in the Alpine
area seem to have been glacial retreat at ~15000 a B.P. Many
sackung stabilize and some undergo the transition to rapid sliding. This
paper concentrates on four mass-movements in crystalline complexes of the
Austrian Alps which have been investigated for aspects of deep-seated
gravitational creep and prediction of the transition to rapid sliding. The
present-day extent of the creeping or sliding of the rock mass has been
modelled by a process of progressive, stress induced damage. Subcritical
crack growth has been assumed to control this process and also the velocity
of the mass movement. A sliding surface and decreasing Coulomb stress at
this surface as a function of slip is a precondition for instability. The
development of the four examples has been modelled successfully by a
rotational slider block model and the conception of subcritical crack growth
and progressive smoothing of the sliding surface. The interrelations between
velocity, pore water pressure, seismic activity and the state of the sliding
surface have been derived. Finally we discuss how the hypothesis inherent in
the models presented could be validated and used for prediction. |
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