{"id":115557,"date":"2026-01-20T18:00:31","date_gmt":"2026-01-20T17:00:31","guid":{"rendered":"https:\/\/www.maccaferri.com\/fr\/success-stories\/securisation-de-cavite-sur-la-rd809-a-banassa-48\/"},"modified":"2026-02-16T15:44:12","modified_gmt":"2026-02-16T14:44:12","slug":"securisation-de-cavite-sur-la-rd809-a-banassa-48","status":"publish","type":"stories","link":"https:\/\/www.maccaferri.com\/fr\/exemples-de-r\u00e9ussites\/securisation-de-cavite-sur-la-rd809-a-banassa-48\/","title":{"rendered":"S\u00e9curisation de cavit\u00e9 sur la RD809 \u00e0 Banassa, 48"},"content":{"rendered":"
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    \"\"<\/div>\n <\/div>\n <\/div>\n
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    Ancrage de la g\u00e9ogrille en tranch\u00e9e \u00a9Sage ing\u00e9nierie<\/p>\n \n <\/div>\n <\/div>\n <\/div>\n <\/div>\n

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    Vue du chantier en cours de r\u00e9alisation \u00a9Sage ing\u00e9nierie<\/p>\n \n <\/div>\n <\/div>\n <\/div>\n <\/div>\n

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    Coupe type du chantier<\/p>\n \n <\/div>\n <\/div>\n <\/div>\n <\/div>\n

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    Vue d'ensemble du chantier \u00a9Sage ing\u00e9nierie<\/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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    Dans le cadre du projet de confortement de la RD809 au PR71+340, la soci\u00e9t\u00e9 SAGE \u00e9tait en charge d’une mission de suivi d’ex\u00e9cution de type G4. Une visite de site a r\u00e9v\u00e9l\u00e9 que la chauss\u00e9e s’\u00e9tait affaiss\u00e9e du fait d’une remont\u00e9e de fontis. Cet al\u00e9a n’ayant pas \u00e9t\u00e9 pr\u00e9vu, la cavit\u00e9 a \u00e9t\u00e9 combl\u00e9e par du remblai dans un premier temps, mais une solution de s\u00e9curisation durable en cas de r\u00e9ouverture de la cavit\u00e9 et de d\u00e9compression des mat\u00e9riaux de comblement devait \u00eatre mis en place. La mise en \u0153uvre d’une dalle b\u00e9ton ferraill\u00e9e de 70cm paraissant trop ch\u00e8re et lourde \u00e0 mettre en \u0153uvre, le bureau d’\u00e9tudes en mission G4 s’est tourn\u00e9 vers un renforcement par g\u00e9ogrille. En effet, celle-ci permettrait d’\u00e9viter un effondrement brutal en maintenant les mat\u00e9riaux au dessus de la cavit\u00e9 tout en limitant la d\u00e9formation en surface. Maccaferri a accompagn\u00e9 le bureau d’\u00e9tudes dans le dimensionnement d’une g\u00e9ogrille adapt\u00e9e et respectant les attentes du CD48. S’agissant d’une route emprunt\u00e9e et pouvant supporter aussi bien des deux roues que des poids lourds, en cas d’ouverture de cavit\u00e9, le tassement diff\u00e9rentiel en surface devrait \u00eatre inf\u00e9rieur \u00e0 4% afin de limiter l’impact sur la circulation.<\/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 zone d’excavation au droit de l’al\u00e9a g\u00e9otechnique \u00e9tait de 12x12m sur 2m de profondeur, avec la cavit\u00e9 de 4m de diam\u00e8tre se situant en son centre. La g\u00e9ogrille est dispos\u00e9e dans l’axe de la route. Les ancrages sont faits de part et d’autre de la cavit\u00e9, d’un c\u00f4t\u00e9 en tranch\u00e9e, et de l’autre \u00e0 plat car la g\u00e9ogrille repose sur une dalle calcaire en cet endroit, rendant le creusement d’une tranch\u00e9e impossible. La zone a ensuite \u00e9t\u00e9 remblay\u00e9e sur 2m et recouverte en surface de l’enrob\u00e9 de la chauss\u00e9e. La g\u00e9ogrille permettant de reprendre les efforts g\u00e9n\u00e9r\u00e9s par une ouverture de cavit\u00e9 tout en limitant la d\u00e9flexion en surface dans ces conditions de projet est une ParaLink 1600. Cette g\u00e9ogrille pr\u00e9sente une r\u00e9sistance \u00e0 la traction \u00e0 court terme de 1600kN\/m et a \u00e9t\u00e9 dimensionn\u00e9e en tenant compte de sa r\u00e9sistance \u00e0 long terme, pour permettre \u00e0 la chauss\u00e9e d’\u00eatre utilis\u00e9e durablement m\u00eame en cas d’ouverture de cavit\u00e9, sans avoir \u00e0 intervenir pour de nouveaux travaux. Il s’agit d’une g\u00e9ogrille form\u00e9e par des bandes r\u00e9alis\u00e9es avec un noyau de filaments en polyester haute t\u00e9nacit\u00e9 align\u00e9s et gain\u00e9s dans un rev\u00eatement poly\u00e9thyl\u00e8ne prot\u00e9geant des impacts ext\u00e9rieurs dus \u00e0 la mise en \u0153uvre ou \u00e0 la d\u00e9gradation chimique au cours de la dur\u00e9e de service. La ParaLink 1600 b\u00e9n\u00e9ficie d’une certification BBA permettant de caract\u00e9riser et de pr\u00e9dire au mieux le comportement de la g\u00e9ogrille \u00e0 long terme. <\/p>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>

    Used Products<\/h2>
    \"G\u00e9ogrilles<\/div>
    G\u00e9ogrilles monoaxiales<\/h6>Paragrid\u00ae WLa g\u00e9ogrille haute performance ParaGrid\u00ae W est caract\u00e9ris\u00e9e par un module tr\u00e8s \u00e9lev\u00e9 et des facteurs de r\u00e9duction plus bas. Cette g\u00e9ogr<\/span>Voir\n \n <\/a>
    star<\/span><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div>","protected":false},"excerpt":{"rendered":"

    La zone d'excavation au droit de l'al\u00e9a g\u00e9otechnique \u00e9tait de 12x12m sur 2m de profondeur, avec la cavit\u00e9 de 4m de diam\u00e8tre se situant en<\/p>\n","protected":false},"featured_media":115530,"parent":0,"menu_order":0,"template":"","stories-category":[],"stories-tag":[],"class_list":["post-115557","stories","type-stories","status-publish","has-post-thumbnail","hentry"],"acf":{"products":[113582],"applications":[103478,103478],"solutions":[103541],"sectors":[103460]},"yoast_head":"\nS\u00e9curisation de cavit\u00e9 sur la RD809 \u00e0 Banassa, 48 - Maccaferri France<\/title>\n<meta name=\"description\" content=\"D\u00e9couvrez nos r\u00e9ussites : S\u00e9curisation de cavit\u00e9 sur la RD809 \u00e0 Banassa, 48. 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