{"id":31200,"date":"2026-09-28T09:08:27","date_gmt":"2026-09-28T09:08:27","guid":{"rendered":"https:\/\/infos-media-nantes.fr\/?p=31200"},"modified":"2026-09-28T09:08:27","modified_gmt":"2026-09-28T09:08:27","slug":"mauves-sur-loire-brgm-etude-front-rocheux-eboulements-2026","status":"publish","type":"post","link":"https:\/\/infos-media-nantes.fr\/mauves-sur-loire-brgm-etude-front-rocheux-eboulements-2026\/","title":{"rendered":"Mauves-sur-Loire : le BRGM ausculte le front rocheux apr\u00e8s plusieurs \u00e9boulements"},"content":{"rendered":"<article>\n<p>\u00c0 Mauves-sur-Loire, les falaises et escarpements qui dominent certains secteurs de la commune font l\u2019objet d\u2019une nouvelle expertise. \u00c0 partir de ce <strong>28 septembre et jusqu\u2019au 2 octobre 2026<\/strong>, le Bureau de recherches g\u00e9ologiques et mini\u00e8res (BRGM) m\u00e8ne une premi\u00e8re campagne de terrain sur le <strong>front rocheux<\/strong>.<\/p>\n<p>Cette \u00e9tude intervient apr\u00e8s plusieurs \u00e9pisodes d\u2019\u00e9boulements. La commune avait sollicit\u00e9 la Pr\u00e9fecture afin de disposer d\u2019un diagnostic plus global des risques et de d\u00e9terminer les mesures de pr\u00e9vention \u00e0 envisager.<\/p>\n<h2>Le BRGM doit \u00e9tablir un diagnostic structurel du front rocheux<\/h2>\n<p>La Direction d\u00e9partementale des territoires et de la mer (DDTM) a accept\u00e9 d\u2019accompagner la commune et a confi\u00e9 l\u2019\u00e9tude au BRGM, organisme public sp\u00e9cialis\u00e9 notamment dans les risques li\u00e9s au sous-sol et aux mouvements de terrain.<\/p>\n<p>Le travail doit permettre d\u2019examiner la structure de la roche, de rep\u00e9rer les secteurs potentiellement instables et d\u2019\u00e9valuer les risques pour les personnes et les biens. \u00c0 partir de ce diagnostic, des mesures de pr\u00e9vention pourront \u00eatre d\u00e9finies.<\/p>\n<h2>Pourquoi un rocher peut-il se d\u00e9tacher ?<\/h2>\n<p>Un front rocheux n\u2019est jamais parfaitement homog\u00e8ne. Il peut \u00eatre parcouru de fractures naturelles dans lesquelles l\u2019eau s\u2019infiltre. Avec le temps, l\u2019\u00e9rosion, les alternances de s\u00e9cheresse et de pluie, la v\u00e9g\u00e9tation ou encore les variations de temp\u00e9rature peuvent contribuer \u00e0 fragiliser certains blocs.<\/p>\n<p>Un \u00e9boulement ne signifie donc pas n\u00e9cessairement que toute une falaise est instable. L\u2019int\u00e9r\u00eat de l\u2019expertise est pr\u00e9cis\u00e9ment de distinguer les zones solides des secteurs qui n\u00e9cessitent une surveillance ou des travaux.<\/p>\n<h2>Des experts doivent acc\u00e9der \u00e0 plusieurs propri\u00e9t\u00e9s<\/h2>\n<p>Pour examiner le front rocheux au plus pr\u00e8s, le BRGM doit acc\u00e9der \u00e0 des terrains publics mais aussi \u00e0 certaines propri\u00e9t\u00e9s priv\u00e9es riveraines. Un arr\u00eat\u00e9 pr\u00e9fectoral autorise cette intervention.<\/p>\n<p>Les habitants concern\u00e9s peuvent r\u00e9server un cr\u00e9neau de visite afin de faciliter l\u2019acc\u00e8s des \u00e9quipes \u00e0 leur parcelle. La commune met \u00e9galement \u00e0 disposition un num\u00e9ro de contact pour les personnes qui ne peuvent pas utiliser la proc\u00e9dure en ligne.<\/p>\n<h2>Un drone pourra compl\u00e9ter les observations<\/h2>\n<p>Selon la configuration du terrain, un drone pourra \u00eatre utilis\u00e9 pour observer des portions difficiles d\u2019acc\u00e8s depuis le sol. Ces images compl\u00e8teront les relev\u00e9s r\u00e9alis\u00e9s directement sur place.<\/p>\n<p>Cette premi\u00e8re campagne ne constitue que le d\u00e9but de l\u2019\u00e9tude. Les conclusions devront ensuite permettre de pr\u00e9ciser la nature des risques et les \u00e9ventuelles interventions \u00e0 programmer.<\/p>\n<p><a href=\"https:\/\/www.mauvessurloire.fr\/actualites\/etude-du-front-rocheux-a-mauves\/\" style=\"color:#5532F0;font-weight:bold;text-decoration:underline\">Consulter les informations et modalit\u00e9s pour les riverains sur le site de Mauves-sur-Loire<\/a><\/p>\n<p><small>Cr\u00e9dit photo : Decathlon Outdoor \u2013 vue depuis les hauteurs de Mauves-sur-Loire.<\/small><br \/>\n<\/article>\n","protected":false},"excerpt":{"rendered":"<p>Le BRGM m\u00e8ne du 28 septembre au 2 octobre une premi\u00e8re expertise du front rocheux de Mauves-sur-Loire apr\u00e8s plusieurs \u00e9pisodes d\u2019\u00e9boulements.<\/p>\n","protected":false},"author":3,"featured_media":31201,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","footnotes":"","event_start_date":"","event_end_date":"","event_location":"","imn_event_city":"","imn_event_start_time":"","imn_event_end_time":"","imn_event_all_day":"","imn_event_address":"","imn_event_ticket_url":"","imn_event_price":"","imn_event_status":"","imn_event_organizer":"","imn_event_accessibility":""},"categories":[22],"tags":[1966,8395,8787,8786,7,1909,4451],"class_list":["post-31200","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites-nantes","tag-brgm","tag-ddtm","tag-eboulements","tag-front-rocheux","tag-loire-atlantique","tag-mauves-sur-loire","tag-risques-naturels"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - 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