{"id":93475,"date":"2016-07-21T12:02:12","date_gmt":"2016-07-21T10:02:12","guid":{"rendered":"http:\/\/batijournal.com\/?p=93475"},"modified":"2019-07-15T12:23:40","modified_gmt":"2019-07-15T10:23:40","slug":"sols-argileux-surveilles","status":"publish","type":"post","link":"https:\/\/batijournal.com\/index.php\/sols-argileux-surveilles\/93475\/","title":{"rendered":"Les sols argileux surveill\u00e9s"},"content":{"rendered":"<p><strong>6 milliards d&rsquo;euros, c&rsquo;est le co\u00fbt des indemnisations du ph\u00e9nom\u00e8ne retrait-gonflement des argiles entre 1990 et 2013. Ce ph\u00e9nom\u00e8ne est le deuxi\u00e8me dans la prise en charge par le r\u00e9gime des catastrophes naturelles en France, apr\u00e8s les inondations.<\/strong><\/p>\n<p>En contexte humide, un sol argileux se pr\u00e9sente comme souple et mall\u00e9able tandis que ce m\u00eame sol dess\u00e9ch\u00e9 sera dur et cassant, avec une variation de volume qui induit de s\u00e9rieux d\u00e9g\u00e2ts sur l&rsquo;habitat. Pour suivre le ph\u00e9nom\u00e8ne et nourrir ses travaux de simulation num\u00e9rique et de cartographie, le BRGM dispose d&rsquo;un site exp\u00e9rimental. De 2005 \u00e0 2014, il \u00e9tait situ\u00e9 \u00e0 Mormoiron dans le Vaucluse, dans un contexte de climat m\u00e9diterran\u00e9en. Les mesures ont permis de mieux comprendre la dessiccation des sols argileux en p\u00e9riode s\u00e8che et d&rsquo;en \u00e9valuer les cons\u00e9quences sur le b\u00e2ti, notamment dans le cadre du projet Argic (Analyse du retrait-gonflement et de ses incidences sur les constructions) financ\u00e9 par l&rsquo;Agence nationale de la recherche. Ce site a \u00e9t\u00e9 d\u00e9plac\u00e9 dans la commune de Chaingy en r\u00e9gion Centre, \u00e0 12 km \u00e0 l&rsquo;ouest d&rsquo;Orl\u00e9ans. Ce nouvel emplacement, o\u00f9 l&rsquo;al\u00e9a est de niveau fort, est tr\u00e8s similaire d&rsquo;un point de vue climatique et g\u00e9ologique \u00e0 la r\u00e9gion parisienne, particuli\u00e8rement touch\u00e9e par le retrait-gonflement des argiles.<\/p>\n<p>La station, dont les premi\u00e8res mesures sont en cours, est \u00e9quip\u00e9e d&rsquo;un pluviom\u00e8tre, d&rsquo;un capteur d&rsquo;ensoleillement et d&rsquo;un capteur d&rsquo;humidit\u00e9 de l&rsquo;air pour la mesure des param\u00e8tres m\u00e9t\u00e9orologiques. Outillage compl\u00e9t\u00e9 par dix sondes d&rsquo;humidit\u00e9 plong\u00e9es \u00e0 1,20 m de profondeur, au milieu de la couche argileuse \u00e9tudi\u00e9e. Cette couche se situe en effet entre 0,80 m et 1,60 m, sur une couche de craie. Deux extensom\u00e8tres, permettant de mesurer les mouvements verticaux dans ce sol argileux, viendront compl\u00e9ter le dispositif.<\/p>\n<p>Les r\u00e9sultats escompt\u00e9s nourriront les travaux de recherche sur les m\u00e9thodes de cartographie des argiles gonflantes, et sur l&rsquo;\u00e9volution de l&rsquo;al\u00e9a notamment en lien avec le changement climatique. L&rsquo;ann\u00e9e 2003, dont la canicule pourrait devenir la norme d&rsquo;ici 2100, a \u00e9t\u00e9 l&rsquo;ann\u00e9e la plus co\u00fbteuse en termes d&rsquo;indemnisation du risque.<\/p>\n<p>Les zones concern\u00e9es par le ph\u00e9nom\u00e8ne retrait-gonflement des argiles se situent dans les bassins s\u00e9dimentaires, bassin parisien, aquitain ou rhodanien essentiellement.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>6 milliards d&rsquo;euros, c&rsquo;est le co\u00fbt des indemnisations du ph\u00e9nom\u00e8ne retrait-gonflement des argiles entre 1990 et 2013. Ce ph\u00e9nom\u00e8ne est le deuxi\u00e8me dans la prise en charge par le r\u00e9gime des catastrophes naturelles en France, apr\u00e8s les inondations. En contexte humide, un sol argileux se pr\u00e9sente comme souple et mall\u00e9able tandis que ce m\u00eame sol [&hellip;]<\/p>\n","protected":false},"author":17,"featured_media":93476,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[6351],"tags":[11131],"class_list":["post-93475","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-energie-environnement","tag-catastrophe-naturelle"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Les sols argileux surveill\u00e9s<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/batijournal.com\/index.php\/sols-argileux-surveilles\/93475\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Les sols argileux surveill\u00e9s\" \/>\n<meta property=\"og:description\" content=\"6 milliards d&rsquo;euros, c&rsquo;est le co\u00fbt des indemnisations du ph\u00e9nom\u00e8ne retrait-gonflement des argiles entre 1990 et 2013. 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