{"id":114997,"date":"2025-12-11T16:59:42","date_gmt":"2025-12-11T15:59:42","guid":{"rendered":"https:\/\/www.maccaferri.com\/fr\/success-stories\/cavites-sur-la-ligne-de-tramway-valtram-13\/"},"modified":"2026-02-16T15:37:15","modified_gmt":"2026-02-16T14:37:15","slug":"cavites-sur-la-ligne-de-tramway-valtram-13","status":"publish","type":"stories","link":"https:\/\/www.maccaferri.com\/fr\/exemples-de-r\u00e9ussites\/cavites-sur-la-ligne-de-tramway-valtram-13\/","title":{"rendered":"Cavit\u00e9s sur la ligne de Tramway ValTRam, 13"},"content":{"rendered":"
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    \"\"<\/div>\n <\/div>\n <\/div>\n
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    Zone de la cavit\u00e9<\/p>\n \n <\/div>\n <\/div>\n <\/div>\n <\/div>\n

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    G\u00e9ogrille de renforcement ParaLink 700<\/p>\n \n <\/div>\n <\/div>\n <\/div>\n <\/div>\n

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    G\u00e9ogrille monoaxiale mise en place<\/p>\n \n <\/div>\n <\/div>\n <\/div>\n <\/div>\n

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    \"\"<\/div>\n <\/div>\n <\/div>\n
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    Coupe type du chantier avec cavit\u00e9s<\/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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    Le projet Val\u2019Tram consiste \u00e0 prolonger la ligne de tramway en exploitation sur Aubagne, dans la vall\u00e9e de l\u2019Huveaune, jusqu\u2019\u00e0 La Bouilladisse. Il emprunte la plateforme de l\u2019ancienne voie ferr\u00e9e, dite de Valdonne, sur 13,2 km. Lors des terrassements de la voie \u00e0 l’entr\u00e9e d’un tunnel existant, une cavit\u00e9 dans le sous sol s’est ouverte, stoppant la progression des travaux. La soci\u00e9t\u00e9 NGE en charge des travaux a demand\u00e9 \u00e0 Maccaferri de dimensionner une g\u00e9ogrille de renforcement en mesure de prot\u00e9ger la voie de tramway contre un tassement diff\u00e9rentiel entre la zone de la cavit\u00e9 (remblay\u00e9e pr\u00e9alablement) et le terrain naturel.<\/p>\n

    A mesure de l\u2019avancement des terrassements, 2 autres cavit\u00e9s ont \u00e9t\u00e9 d\u00e9couvertes \u00e0 quelques m\u00e8tres de la 1\u00e8re cavit\u00e9, sans que celles-ci ne semblent communiquer entre elles. En surface, entre les cavit\u00e9s, un substratum calcaire a \u00e9t\u00e9 observ\u00e9.<\/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 g\u00e9ogrille de renforcement a \u00e9t\u00e9 dimensionn\u00e9e par le bureau technique de Maccaferri selon la norme XPG38-065 qui permet de d\u00e9terminer la r\u00e9sistance et la d\u00e9formation du g\u00e9osynth\u00e9tique en fonction de la d\u00e9formation admissible en surface et du diam\u00e8tre de la cavit\u00e9. Dans le cas d’une voie ferr\u00e9e, le tassement diff\u00e9rentiel admissible en surface est de 0%, ce qui sollicite la g\u00e9ogrille \u00e0 un niveau de d\u00e9formation tr\u00e8s faible et \u00e0 une raideur \u00e9lev\u00e9e. Fondasol en charge de la mission G4 a demand\u00e9 de consid\u00e9rer une cavit\u00e9 de diam\u00e8tre 2m et la g\u00e9ogrille a \u00e9t\u00e9 positionn\u00e9e \u00e0 1m50 sous le niveau fini de la voie. Une d\u00e9formation de 0,73% a \u00e9t\u00e9 consid\u00e9r\u00e9 \u00e0 long terme dans le renforcement, ce qui a n\u00e9cessit\u00e9 l’usage de 2 rangs de Paralink\u00ae 700, ayant une r\u00e9sistance nominale \u00e0 la traction de 700kN\/m. La mise en oeuvre a \u00e9t\u00e9 r\u00e9alis\u00e9e en recouvrant l’ensemble des cavit\u00e9s et en r\u00e9alisant une tranch\u00e9e d’ancrage en extr\u00e9mit\u00e9 de la zone \u00e0 prot\u00e9ger de 50x50cm, situ\u00e9e \u00e0 3m50 du bord des cavit\u00e9s.<\/p>\n

    Les g\u00e9ogrilles Paralink\u00ae sont des structures planes monodirectionnelles constitu\u00e9es de bandes r\u00e9alis\u00e9es avec un noyau de filaments en polyester haute t\u00e9nacit\u00e9, parfaitement align\u00e9s et gain\u00e9s dans une protection en poly\u00e9thyl\u00e8ne. Elles sont certifi\u00e9es BBA, organisme britannique ind\u00e9pendant, \u00e9valuant les caract\u00e9ristiques techniques du produit en fonction de l’environnement dans lequel il est mis en place et de sa dur\u00e9e de vie. <\/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 g\u00e9ogrille de renforcement a \u00e9t\u00e9 dimensionn\u00e9e par le bureau technique de Maccaferri selon la norme XPG38-065 qui permet de d\u00e9terminer la r\u00e9sis<\/p>\n","protected":false},"featured_media":114970,"parent":0,"menu_order":0,"template":"","stories-category":[],"stories-tag":[],"class_list":["post-114997","stories","type-stories","status-publish","has-post-thumbnail","hentry"],"acf":{"products":[113582],"applications":[103478,103478],"solutions":[103541],"sectors":[103460]},"yoast_head":"\nCavit\u00e9s sur la ligne de Tramway ValTRam, 13 - Maccaferri France<\/title>\n<meta name=\"description\" content=\"D\u00e9couvrez nos r\u00e9ussites : Cavit\u00e9s sur la ligne de Tramway ValTRam, 13. 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