{"id":110461,"date":"2025-10-29T07:58:23","date_gmt":"2025-10-29T06:58:23","guid":{"rendered":"https:\/\/www.maccaferri.com\/fr\/success-stories\/stabilisation-du-casier-a-sediments-du-polder-de-brest-brest-29\/"},"modified":"2026-02-16T15:39:54","modified_gmt":"2026-02-16T14:39:54","slug":"stabilisation-du-casier-a-sediments-du-polder-de-brest-brest-29","status":"publish","type":"stories","link":"https:\/\/www.maccaferri.com\/fr\/exemples-de-r\u00e9ussites\/stabilisation-du-casier-a-sediments-du-polder-de-brest-brest-29\/","title":{"rendered":"Stabilisation du casier \u00e0 s\u00e9diments du Polder de Brest – Brest, 29"},"content":{"rendered":"
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    \"\"<\/div>\n <\/div>\n <\/div>\n
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    Rouleaux ancr\u00e9s sous la piste p\u00e9riph\u00e9rique, d\u00e9roul\u00e9s vers le centre du casier<\/p>\n \n <\/div>\n <\/div>\n <\/div>\n <\/div>\n

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    Macgrid CE pos\u00e9e en 2 couches crois\u00e9es et lest\u00e9s<\/p>\n \n <\/div>\n <\/div>\n <\/div>\n <\/div>\n

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    Mise en \u0153uvre de la couverture<\/p>\n \n <\/div>\n <\/div>\n <\/div>\n <\/div>\n

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    Rouleaux de MacGrid CE 40S<\/p>\n \n <\/div>\n <\/div>\n <\/div>\n <\/div>\n

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    Vue a\u00e9rienne du chantier<\/p>\n \n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n\n <\/div>\n <\/div>

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    Challenge<\/h3>\n <\/div>\n <\/div>\n <\/div>\n <\/div> \n <\/div>\n
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    Depuis 2007, la R\u00e9gion Bretagne a engag\u00e9 le projet d\u2019un nouveau polder \u00e0 Brest afin d\u2019implanter un terminal d\u00e9di\u00e9 aux \u00e9nergies marines renouvelables. C\u2019est un quai de 380m de long pour l\u2019accueil des bateaux transportant des \u00e9oliennes ainsi qu\u2019un vaste polder qui verra le jour. Le chantier s\u2019\u00e9tend sur 50 hectares dont 15 ha gagn\u00e9s sur la mer dans une zone pr\u00e9sentant une forte couche de vase. La difficult\u00e9 \u00e9tait donc de construire le quai, la plateforme et la digue d’encl\u00f4ture sur un fond marin tr\u00e8s peu portant. Plus d’un million de m3 de s\u00e9diments fins ont \u00e9t\u00e9 dragu\u00e9s et stock\u00e9s dans un casier \u00e0 l\u2019arri\u00e8re de la digue. <\/p>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n

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    Solution<\/h3>\n <\/div>\n <\/div>\n <\/div>\n <\/div> \n <\/div>\n
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    La soci\u00e9t\u00e9 Maccaferri a \u00e9t\u00e9 sollicit\u00e9e par la soci\u00e9t\u00e9 SDI pour une solution de stabilisation par g\u00e9ogrille pour recouvrir le casier \u00e0 s\u00e9diments (Impossibilit\u00e9 de mettre en oeuvre la couverture car les mat\u00e9riaux se m\u00e9langeaient aux s\u00e9diments).<\/p>\n

    La solution g\u00e9osynth\u00e9tique la plus adapt\u00e9e est le g\u00e9ocomposite de traficabilit\u00e9 MacGrid CE 40S compos\u00e9 d\u2019un g\u00e9otextile de filtration et d\u2019une g\u00e9ogrille de stabilisation. Le g\u00e9otextile assure la s\u00e9paration entre les s\u00e9diments et la couche de remblai emp\u00eachant la remont\u00e9e des nombreuses particules fines. La g\u00e9ogrille en polypropyl\u00e8ne extrud\u00e9e pr\u00e9sente une r\u00e9sistance bidirectionnelle et une tr\u00e8s forte raideur \u00e0 faible d\u00e9formation (plus de 1100 kN\/m \u00e0 seulement \u00e0 0,5 % de d\u00e9formation). Ses mailles carr\u00e9es rigides et \u00e9paisses permettent un interblocage des particules de remblai et assurent un confinement lat\u00e9ral de la base du remblai augmentant l’angle de diffusion de la charge et la portance.<\/p>\n

    Plus de 148 000 m\u00b2 de Macgrid CE40S ont \u00e9t\u00e9 install\u00e9es en deux couches crois\u00e9es dans le but d\u2019une continuit\u00e9 de la filtration et de renforcement. La Macgrid CE a \u00e9t\u00e9 plac\u00e9e depuis le bord du casier et d\u00e9roul\u00e9e vers le centre. Une fois l\u2019ensemble d\u2019une zone recouverte, les mat\u00e9riaux de couverture ont \u00e9t\u00e9 pouss\u00e9s depuis le bord vers le centre \u00e0 l\u2019aide d\u2019un bulldozer l\u00e9ger.<\/p>\n

    Le dimensionnement et la portance offerts par la MacGrid CE se sont r\u00e9v\u00e9l\u00e9s une nouvelle fois concluants sur des sols non portants.<\/p>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>

    Used Products<\/h2>
    \"G\u00e9ogrilles<\/div>
    G\u00e9ogrilles biaxiales<\/h6>MacGrid WG-S Des g\u00e9ogrilles enduites tricot\u00e9es en PET \u00e0haute t\u00e9nacit\u00e9 sont \u00e9galement disponibles et utilis\u00e9es dans ces types d’applicat<\/span>Voir\n \n <\/a>
    star<\/span><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div>","protected":false},"excerpt":{"rendered":"

    La soci\u00e9t\u00e9 Maccaferri a \u00e9t\u00e9 sollicit\u00e9e par la soci\u00e9t\u00e9 SDI pour une solution de stabilisation par g\u00e9ogrille pour recouvrir le casier \u00e0 s\u00e9dime<\/p>\n","protected":false},"featured_media":81647,"parent":0,"menu_order":0,"template":"","stories-category":[],"stories-tag":[],"class_list":["post-110461","stories","type-stories","status-publish","has-post-thumbnail","hentry"],"acf":{"products":[113600],"applications":[103517,103517],"solutions":[103622],"sectors":[103445]},"yoast_head":"\nStabilisation du casier \u00e0 s\u00e9diments du Polder de Brest - Brest, 29 - Maccaferri France<\/title>\n<meta name=\"description\" content=\"D\u00e9couvrez nos r\u00e9ussites : Stabilisation du casier \u00e0 s\u00e9diments du Polder de Brest - Brest, 29. 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