Quantitative assessment of the residual risk in a rockfall protected area |
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Authors: | Jordi Corominas Ramon Copons José Moya Joan M Vilaplana Joan Altimir Jordi Amigó |
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Institution: | (1) Department of Geotechnical Engineering and Geosciences, Technical University of Catalonia—UPC, Campus Nord UPC, Jordi Girona 1-3, D-2 Building, 08034 Barcelona, Spain;(2) Euroconsult, Na Maria Plana 33, Andorra la Vella, Principality of Andorra, Barcelona, Spain;(3) RISKNAT Group, Departament de Geodinàmica i Geofísica, Facultat de Geologia, Universitat de Barcelona, Martí Franques s/n 08028, Barcelona, Spain;(4) Eurogeotecnica, Avda. De les Corts Catalanes 5-7, 08190, Sant Cugat del Vallès, Barcelona, Spain |
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Abstract: | Quantitative Risk Assessment (QRA) has become an indispensable tool for the management of landslide hazard and for planning
risk mitigation measures. In this paper we present the evaluation of the rockfall risk at the Solà d’Andorra slope (Andorra
Principality) before and after the implementation of risk mitigation works, in particular, the construction of protective
fences. To calculate the risk level we have (i) identified the potential rockfall release areas, (ii) obtained the volume
distribution of the falling rocks, (iii) determined the frequency of the rockfall events, and (iv) performed trajectographic
analysis with a 3D numerical model (Eurobloc) that has provided both the expected travel distances and the kinetic energy
of the blocks. The risk level at the developed area located at the foot of the rock cliff has been calculated taking into
account the nature of the exposed elements and their vulnerability. In the Forat Negre basin, the most dangerous basin of
the Solà d’Andorra, the construction of two lines of rockfall protection fences has reduced the annual probability of loss
of life for the most exposed person inside the buildings, from 3.8×10−4 to 9.1×10−7 and the societal risk from 1.5×10−2 of annual probability of loss of life to 1.2×10−5. |
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Keywords: | Rockfall Quantitative risk assessment Residual risk Pyrenees Principality of Andorra |
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