The Diezma landslide (A-92 motorway, Southern Spain): history and potential for future reactivation

A complete failure analysis of a complex landslide located in Southern Spain (the Diezma landslide) has been undertaken using geotechnical, geophysical and geological data. The triggering factors were a high groundwater level and the reduction in the shear strength parameters of the high-plasticity...

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Bibliographic Details
Published in:Bulletin of engineering geology and the environment 2011-11, Vol.70 (4), p.681-689
Main Authors: Rodríguez-Peces, Martín Jesús, Azañón, José Miguel, García-Mayordomo, Julián, Yesares, Jesús, Troncoso, Emilia, Tsige, Meaza
Format: Article
Language:English
Subjects:
Earth and Environmental Science
Earth Sciences
Foundations
Geoecology/Natural Processes
Geoengineering
Geotechnical Engineering & Applied Earth Sciences
Hydraulics
Nature Conservation
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Summary:A complete failure analysis of a complex landslide located in Southern Spain (the Diezma landslide) has been undertaken using geotechnical, geophysical and geological data. The triggering factors were a high groundwater level and the reduction in the shear strength parameters of the high-plasticity clay. The 2010 reactivation of the landslide was related to the poor performance of the first line of deep drainage wells, although the second and third line of wells and the anchored pile barrier were effective in preventing the landslide reaching the A-92 motorway. Analysis indicates that further reactivation of the Diezma landslide could take place following a period of heavy rain if the drainage wells are not properly maintained, or if an earthquake of M w 4.0–5.0 occurs within 25 km of the site.
ISSN:1435-9529
1435-9537
DOI:10.1007/s10064-011-0371-x