{"id":138,"date":"2013-05-20T21:30:56","date_gmt":"2013-05-20T20:30:56","guid":{"rendered":"http:\/\/www.speleologie.ch\/mdemierre\/?p=138"},"modified":"2026-05-14T16:10:09","modified_gmt":"2026-05-14T15:10:09","slug":"co-et-explosifs","status":"publish","type":"post","link":"https:\/\/www.techt.ch\/mdemierre\/?p=138","title":{"rendered":"CO et explosifs"},"content":{"rendered":"<p>Lors de travaux aux explosifs en milieu confin\u00e9, par exemple en sp\u00e9l\u00e9ologie, il faut absolument tenir compte des d\u00e9gagements de gaz toxiques provoqu\u00e9s par l&rsquo;explosif et le d\u00e9tonateur. Ceci est particuli\u00e8rement vrais dans des zones confin\u00e9es avec peu de renouvellement de l&rsquo;air. Parmi les gaz produits, il faut \u00eatre particuli\u00e8rement vigilant avec le monoxyde de carbone CO: un gaz invisible, inodor et mortel&#8230;<\/p>\n<blockquote><p>Pour en savoir plus, vous pouvez t\u00e9l\u00e9charger la publication<\/p>\n<p><span style=\"color: #33cccc; text-decoration: underline;\"><strong><a href=\"http:\/\/www.speleologie.ch\/mdemierre\/wp-content\/uploads\/co.pdf\" target=\"_blank\"><span style=\"color: #33cccc; text-decoration: underline;\">Monoxyde de carbone et minage en sp\u00e9l\u00e9ologie<\/span><\/a><\/strong><\/span><\/p>\n<p>qui pr\u00e9sente une analyse d\u00e9taill\u00e9e des risques li\u00e9s au gaz lors de l&rsquo;utilisation d&rsquo;explosifs en sp\u00e9l\u00e9ologie (2006). <\/p><\/blockquote>\n<p>Dans le tableau ci-dessous, la production de CO de diff\u00e9rentes substances explosives. Ceci permet d&rsquo;\u00e9valer rapidement la concentration de CO cons\u00e9qutive au tir. \u00a0C&rsquo;est tr\u00e8s efficace pour \u00e9valuer la faisabilit\u00e9 d&rsquo;un minage en milieu confin\u00e9, en comparant cette concentration aux normes d&rsquo;exposition. Elle ne dispense \u00e9videmment pas de la mesure en continu de la concentration de CO.<\/p>\nngg_shortcode_0_placeholder\n<p>&nbsp;<\/p>\n<p>Exemple de calcul du d\u00e9gagement de CO, pour une charge de 20 cm de cordeau 24 g\/m dans un volume de 18 m3 :<\/p>\n<ul>\n<li>D\u00e9gagement sp\u00e9cifique de CO du cordeau 24 g\/m : Gco = 320 ppm\/g*m3<\/li>\n<li>Masse de cordeau : Mco = 0.2 m * 24 g\/m = 1530 ppm*m3<\/li>\n<li>D\u00e9gagement de CO du cordeau : Gco * Mco 120 ppm*m3<\/li>\n<li>D\u00e9gagement de CO d&rsquo;une amorce : 120 ppm*m3<\/li>\n<li>D\u00e9gagemet total de la charge : 1530+120 = 1650 ppm*m3<\/li>\n<li>Pour un volume de dissolution de 18m3, cela donne une concentration de CO juste apr\u00e8s l&rsquo;explosion de: 1650\/18 = <strong><span style=\"text-decoration: underline;\">90ppm<\/span><\/strong><\/li>\n<\/ul>\n<p>Mise en ouvre d&rsquo;un Appareil Respiratoire Isolant (ARI) pour p\u00e9n\u00e9trer en atmosph\u00e8re contamin\u00e9e lors d&rsquo;un stage :<\/p>\n<div class=\"ast-oembed-container \" style=\"height: 100%;\"><iframe loading=\"lazy\" title=\"Appareil Respiratoire Isolant en souterrain\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/jYSVHAwKNbs?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n<p>Des informations compl\u00e9mentaires et plus r\u00e9centes que ceux de la publications ci-dessus sont pr\u00e9sent\u00e9s dans notre cours de minage en milieu confin\u00e9.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Lors de travaux aux explosifs en milieu confin\u00e9, par exemple en sp\u00e9l\u00e9ologie, il faut absolument tenir compte des d\u00e9gagements de [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":141,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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