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| Titel |
Methodology to evaluate rock slope stability under seismic conditions at Solà de Santa Coloma, Andorra |
| VerfasserIn |
O. Mavrouli, J. Corominas, J. Wartman |
| 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 ; 9, no. 6 ; Nr. 9, no. 6 (2009-11-05), S.1763-1773 |
| Datensatznummer |
250007047
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| Publikation (Nr.) |
 copernicus.org/nhess-9-1763-2009.pdf |
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| Zusammenfassung |
| An analytical methodology is presented to evaluate rock slope stability under
seismic conditions by considering the geomechanical and topographic
properties of a slope. The objective is to locate potential rockfall source
areas and evaluate their susceptibility in terms of probability of failure.
For this purpose, the slope face of a study area is discretized into cells
having homogenous aspect, slope angle, rock properties and joint set
orientations. A pseudostatic limit equilibrium analysis is performed for each
cell, whereby the destabilizing effect of an earthquake is represented by a
horizontal force. The value of this force is calculated by linear
interpolation between the peak horizontal ground acceleration PGA at the base
and the top of the slope. The ground acceleration at the top of the slope is
increased by 50% to account for topographic amplification. The uncertainty
associated with the joint dip is taken into account using the Monte Carlo
method. The proposed methodology was applied to a study site with moderate
seismicity in Solà de Santa Coloma, located in the Principality of
Andorra. The results of the analysis are consistent with the spatial
distribution of historical rockfalls that have occurred since 1997. Moreover,
the results indicate that for the studied area, 1) the most important factor
controlling the rockfall susceptibility of the slope is water pressure in
joints and 2) earthquake shaking with PGA of ≤0.16 g will cause a
significant increase in rockfall activity only if water levels in joints are
greater than 50% of the joint height. |
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