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Le site du Port Tanger Mediterranee, situe sur les flyschs de Tisirene de l’unite de Tanger faisant partie du domaine externe rifain, a fait l’objet de plusieurs campagnes de reconnaissance geotechnique qui ont permis d’etablir une synthese geologique et geotechnique et de reperer des couches de sables satures susceptibles de liquefier sous l’effet des seismes. L’analyse du risque de liquefaction est conduite sur la base des essais in situ (CPTU) et selon les deux seismes consideres dans le projet. Elle montre que la zone a risque est reduite et se situe entre les essais CPT22 et 25 et que le seisme lointain est plus nefaste pour le terrain que le seisme de source proche. La charge appliquee par l’ouvrage reduit ou attenue selon les cas le potentiel de liquefaction, il subsiste cependant dans la partie superficielle du sol  sur environ 3m de hauteur. Tangier Mediterranean Port: geological & geotechnical study & assessing the risk of earthquake-related liquefaction using the Cone Penetration Test (CPTU) The geological basement of the Tangier Mediterranean port (southeastern Gibraltar coast) is here studied to locate sand-saturated levels, in order to assess the risk of earthquake-induced liquefaction. Geological and geotechnical field analyses based on cone penetration tests (CPTU) lead to the four following results: (i) the high-risk area is reduced and is situated between CPT22 and 25, (ii) clayey silty sands prone to earthquake-related liquefaction directly occur beneath the protecting structures, (iii) the distant earthquake source is more fatal for the ground beneath the studied port, than the earthquake from a close source, and (iv) the load applied by the building can reduce the potential of liquefaction, but remains efficient only for the first 3m depth. Keywords: Tangier Mediterranean Port; Geology; Geotechnical; Cone penetration test; Earthquakes intensity of project; Risk of liquefaction.

Port Tanger Méditerranée : étude géologique et géotechnique, et analyse du risque de liquéfaction à partir des essais in situ