{"id":5672,"date":"2026-07-10T10:10:51","date_gmt":"2026-07-10T10:10:51","guid":{"rendered":"https:\/\/eurohinca.com\/?p=5672"},"modified":"2026-07-10T10:10:54","modified_gmt":"2026-07-10T10:10:54","slug":"comment-detecter-les-noeuds-les-blocs-et-les-obstacles-enfouis-avant-de-proceder-a-un-microtunnelage","status":"publish","type":"post","link":"https:\/\/eurohinca.com\/fr\/como-se-detectan-bolos-bloques-y-obstaculos-enterrados-antes-de-ejecutar-una-microtunelacion\/","title":{"rendered":"Comment d\u00e9tecter les cavit\u00e9s, les blocs et les obstacles enfouis avant de r\u00e9aliser un microtunnelage ?"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Les <strong>rochers, blocs et obstacles enfouis<\/strong> Ils sont d\u00e9tect\u00e9s avant le creusement d'un microtunnel gr\u00e2ce \u00e0 une combinaison d'\u00e9tudes g\u00e9otechniques, de reconnaissance du terrain, d'essais in situ, d'analyse documentaire et, le cas \u00e9ch\u00e9ant, de m\u00e9thodes g\u00e9ophysiques ou de sondages localis\u00e9s. L'objectif est d'identifier les \u00e9l\u00e9ments durs, les h\u00e9t\u00e9rog\u00e9n\u00e9it\u00e9s ou les interf\u00e9rences susceptibles d'affecter l'avancement de la tunneli\u00e8re, l'usure des outils, la stabilit\u00e9 du front de taille ou le risque de blocage.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Dans les projets de <a href=\"https:\/\/eurohinca.com\/fr\/eperonnage-de-tuyaux-2\/\">le fon\u00e7age de tuyaux<\/a>, <a href=\"https:\/\/eurohinca.com\/fr\/applications-terrestres-souterraines\/\">le microtunnelage dans les applications terrestres et souterraines<\/a> y <a href=\"https:\/\/eurohinca.com\/fr\/traversees-dinfrastructures\/\">Travers\u00e9es d'infrastructures<\/a>, cette d\u00e9tection pr\u00e9alable est essentielle car un obstacle impr\u00e9vu peut entra\u00eener des arr\u00eats, des d\u00e9tours, des surco\u00fbts, des changements d'outillage, voire la n\u00e9cessit\u00e9 de modifier la m\u00e9thode de construction.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Ce que l'on cherche \u00e0 d\u00e9tecter<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Avant de lancer les travaux, il convient de d\u00e9terminer :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Bolos et blocs naturels<\/strong>, fr\u00e9quentes dans les d\u00e9p\u00f4ts alluviaux, glaciaires, colluviaux ou les sols h\u00e9t\u00e9rog\u00e8nes.<\/li>\n\n\n\n<li><strong>Roche saine ou fractur\u00e9e<\/strong>, surtout s'il appara\u00eet de mani\u00e8re discontinue dans des sols plus meubles.<\/li>\n\n\n\n<li><strong>D\u00e9charges anthropiques<\/strong>, avec des vestiges de b\u00e9ton, de ma\u00e7onnerie, de brise-lames, d'anciennes fondations ou de gravats.<\/li>\n\n\n\n<li><strong>Services souterrains non r\u00e9pertori\u00e9s<\/strong>, telles que les anciennes canalisations, les galeries, les syst\u00e8mes de drainage, les c\u00e2bles ou les collecteurs hors plan.<\/li>\n\n\n\n<li><strong>\u00c9l\u00e9ments structurels \u00e0 proximit\u00e9<\/strong>, tels que les pieux, les parois moul\u00e9es, les fondations, les dalles, les murs ou les ancrages.<\/li>\n\n\n\n<li><strong>Cavit\u00e9s ou trous<\/strong>, qui peuvent alt\u00e9rer la stabilit\u00e9 du front et le comportement du terrain.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">M\u00e9thodes courantes de d\u00e9tection<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Campagne de sondages :<\/strong><br>Les forages permettent d'\u00e9tudier le terrain le long du trac\u00e9 et dans les zones de puits. Ils fournissent des carottes, une description stratigraphique, la profondeur des couches, ainsi que des informations sur la pr\u00e9sence de roche, de blocs, de remblais ou de changements brusques de mat\u00e9riau. Leur densit\u00e9 et leur profondeur doivent \u00eatre adapt\u00e9es au niveau de risque du projet.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Essais sur site et en laboratoire :<\/strong><br>Les essais SPT, CPT, les p\u00e9n\u00e9trom\u00e8tres, les essais de r\u00e9sistance, la granulom\u00e9trie, l'abrasivit\u00e9 ou la compression simple permettent d'\u00e9valuer la facilit\u00e9 d'excavation du sol et la pr\u00e9sence \u00e9ventuelle de mat\u00e9riaux durs ou h\u00e9t\u00e9rog\u00e8nes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>R\u00e9trospective historique et documentaire :<\/strong><br>Les anciens plans, la cartographie g\u00e9ologique, les informations relatives aux travaux ant\u00e9rieurs, les r\u00e9seaux existants, les orthophotos, les projets d'urbanisation ou la documentation relative aux infrastructures voisines peuvent r\u00e9v\u00e9ler la pr\u00e9sence de remblais, de fondations, d'anciens lits de cours d'eau, de galeries ou de r\u00e9seaux non visibles.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>G\u00e9ophysique appliqu\u00e9e :<\/strong><br>Dans certains cas, on peut recourir au g\u00e9oradar, \u00e0 la sismique, \u00e0 la tomographie \u00e9lectrique, \u00e0 la magn\u00e9tom\u00e9trie ou \u00e0 d'autres m\u00e9thodes indirectes pour localiser des anomalies. Leur efficacit\u00e9 d\u00e9pend du terrain, de la profondeur, de l'humidit\u00e9, des interf\u00e9rences urbaines et de la taille de l'obstacle.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Forages ou sondages localis\u00e9s :<\/strong><br>Lorsqu'on soup\u00e7onne la pr\u00e9sence de r\u00e9seaux, de remblais, de fondations ou d'obstacles \u00e0 faible profondeur, les sondages permettent de v\u00e9rifier physiquement ces informations avant de commencer le battage.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Inspection des services concern\u00e9s :<\/strong><br>La localisation des r\u00e9seaux existants doit combiner les plans fournis par les entreprises, la d\u00e9tection sur le terrain, l'inspection des regards, les sondages et la coordination avec les gestionnaires de r\u00e9seaux.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Comment la d\u00e9tection influence-t-elle le choix d'une machine \u00e0 creuser des tunnels ?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">La pr\u00e9sence de rochers, de blocs ou de terrains mixtes conditionne la <a href=\"https:\/\/eurohinca.com\/fr\/choix-du-tunnelier\/\">choix du tunnelier<\/a>, la conception de la t\u00eate de coupe, les outils, le syst\u00e8me d'extraction, les param\u00e8tres d'avance et la strat\u00e9gie de maintenance.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Si le terrain est stable et peut \u00eatre excav\u00e9, on peut envisager un <a href=\"https:\/\/eurohinca.com\/fr\/bouclier-ouvert\/\">bouclier ouvert<\/a>. Si un contr\u00f4le de la pression des terres s'av\u00e8re n\u00e9cessaire, on peut envisager une <a href=\"https:\/\/eurohinca.com\/fr\/bouclier-ferme-epb\/\">EPB TBM<\/a>. S'il y a en outre de l'eau, une perm\u00e9abilit\u00e9 ou une pression hydraulique importante, il peut \u00eatre n\u00e9cessaire de pr\u00e9voir un <a href=\"https:\/\/eurohinca.com\/fr\/bouclier-ferme-hydro-shield\/\">hydro-shield pour les terrains gorg\u00e9s d'eau<\/a>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Risques li\u00e9s \u00e0 une d\u00e9tection tardive<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Le fait de ne pas rep\u00e9rer les bosses, les blocs ou les obstacles enfouis peut entra\u00eener :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Blocage ou freinage de la t\u00eate de coupe.<\/li>\n\n\n\n<li>Usure acc\u00e9l\u00e9r\u00e9e des outils.<\/li>\n\n\n\n<li>Augmentation des efforts de pouss\u00e9e et du couple de cisaillement.<\/li>\n\n\n\n<li>\u00c9carts d'alignement ou de cote.<\/li>\n\n\n\n<li>Sur-excavation ou perte de terrain.<\/li>\n\n\n\n<li>Arr\u00eats prolong\u00e9s pour intervention.<\/li>\n\n\n\n<li>Dommages aux canalisations, aux raccords ou aux \u00e9quipements.<\/li>\n\n\n\n<li>Allongement des d\u00e9lais et augmentation des co\u00fbts.<\/li>\n\n\n\n<li>N\u00e9cessit\u00e9 de traitements d'appoint ou de changement de m\u00e9thode.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Que faire si le risque est \u00e9lev\u00e9 ?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Lorsque le risque de rencontrer des obstacles est \u00e9lev\u00e9, il est possible de renforcer les \u00e9tudes g\u00e9otechniques, d'augmenter la densit\u00e9 des sondages, de r\u00e9aliser des forages d'essai dans les zones critiques, de combiner des m\u00e9thodes g\u00e9ophysiques, de revoir le trac\u00e9, de modifier la profondeur, de choisir une t\u00eate de coupe plus adapt\u00e9e ou de d\u00e9finir des proc\u00e9dures d'urgence.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Dans certains projets, il peut \u00e9galement \u00eatre n\u00e9cessaire d'ajuster l'emplacement des <a href=\"https:\/\/eurohinca.com\/fr\/arbres-verticaux\/\">puits d'entra\u00eenement vertical et microtunnelier<\/a> afin de faciliter l'acc\u00e8s, les interventions, les changements d'outils ou la r\u00e9cup\u00e9ration du mat\u00e9riel.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Liste de contr\u00f4le minimale pour d\u00e9tecter les obstacles enfouis :<\/strong> sondages, carottages, profil g\u00e9ologique, SPT\/CPT, granulom\u00e9trie, abrasivit\u00e9, niveau phr\u00e9atique, cartographie historique, plans des r\u00e9seaux, g\u00e9oradar ou \u00e9tudes g\u00e9ophysiques le cas \u00e9ch\u00e9ant, sondages localis\u00e9s, inspection des regards, v\u00e9rification des fondations voisines et analyse des travaux ant\u00e9rieurs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Demander un <a href=\"https:\/\/eurohinca.com\/fr\/demande-doffre\/\">analyse technique des risques li\u00e9s aux rochers, blocs et obstacles enfouis<\/a> avant de fermer le trac\u00e9 ou de choisir le tunnelier.<\/p>","protected":false},"excerpt":{"rendered":"<p>Los bolos, bloques y obst\u00e1culos enterrados se detectan antes de una microtunelaci\u00f3n combinando investigaci\u00f3n geot\u00e9cnica, reconocimiento del terreno, ensayos in situ, revisi\u00f3n documental y, cuando aplica, m\u00e9todos geof\u00edsicos o catas localizadas. El objetivo es identificar elementos duros, heterogeneidades o interferencias que puedan afectar al avance de la tuneladora, al desgaste de herramientas, a la estabilidad [&hellip;]<\/p>\n","protected":false},"author":80,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[146],"tags":[],"class_list":["post-5672","post","type-post","status-publish","format-standard","hentry","category-preguntas-frecuentes"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Bolos y obst\u00e1culos en microtunelaci\u00f3n<\/title>\n<meta name=\"description\" content=\"C\u00f3mo detectar bolos, bloques y obst\u00e1culos enterrados antes de una microtunelaci\u00f3n mediante sondeos, geof\u00edsica, catas y revisi\u00f3n documental.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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