ROAD Slope Instabilities in Schist Massifs: Case of the National Road Linking Marrakech to Ouarzazate (Morocco)
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The national road RN9 connecting Marrakech and Ouarzazate is located in a mountainous area with steep slopes. Several instabilities are recorded along this road including the Tishka massif which rises to 2300 m. These instabilities often hinder the road operation especially during periods of poor weather conditions. A geological and geotechnical study made it possible to better understand the origin of the instabilities in the Tishka massif. The monitoring of these instabilities by a series of inclinometers showed significant displacements (18 mm/month) to 5 and 15 m of depth. This study showed that the instabilities are the result of benches slips according to fractures plans and schistosity or sometimes linked to a regional fault mapped for the first time in this study. A geotechnical model was developed and integrated in the Plaxis software to discuss and validate the different slopes strengthening solutions.
KeywordsRoad slopes Instability Schist massif Strengthening Tishka Morocco
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