\ud835\udc0f\ud835\udc2b\u00e9\ud835\udc2c\ud835\udc1e\ud835\udc2b\ud835\udc2f\ud835\udc1e\ud835\udc2b \ud835\udc2e\ud835\udc27 \ud835\udc1b\u00e2\ud835\udc2d\ud835\udc22\ud835\udc26\ud835\udc1e\ud835\udc27\ud835\udc2d \ud835\udc21\ud835\udc22\ud835\udc2c\ud835\udc2d\ud835\udc28\ud835\udc2b\ud835\udc22\ud835\udc2a\ud835\udc2e\ud835\udc1e \ud835\udc2d\ud835\udc28\ud835\udc2e\ud835\udc2d \ud835\udc1e\ud835\udc27 \ud835\udc2d\ud835\udc2b\ud835\udc1a\ud835\udc22\ud835\udc2d\ud835\udc1a\ud835\udc27\ud835\udc2d \ud835\udc1e\ud835\udc1f\ud835\udc1f\ud835\udc22\ud835\udc1c\ud835\udc1a\ud835\udc1c\ud835\udc1e\ud835\udc26\ud835\udc1e\ud835\udc27\ud835\udc2d \ud835\udc1d\ud835\udc1e\ud835\udc2c \ud835\udc1c\ud835\udc28\ud835\udc27\ud835\udc1d\ud835\udc22\ud835\udc2d\ud835\udc22\ud835\udc28\ud835\udc27\ud835\udc2c \ud835\udc1d\ud835\udc1e \ud835\udc2c\ud835\udc28\ud835\udc25 \ud835\udc1c\ud835\udc28\ud835\udc26\ud835\udc29\ud835\udc25\ud835\udc1e\ud835\udc31\ud835\udc1e\ud835\udc2c : \ud835\udc2d\ud835\udc1e\ud835\udc25 \u00e9\ud835\udc2d\ud835\udc1a\ud835\udc22\ud835\udc2d \ud835\udc25\ud835\udc1e \ud835\udc1d\u00e9\ud835\udc1f\ud835\udc22 \ud835\udc2b\ud835\udc1e\ud835\udc25\ud835\udc1e\ud835\udc2f\u00e9 \ud835\udc29\ud835\udc1a\ud835\udc2b \ud835\udc0c\ud835\udc1e\ud835\udc1d\ud835\udc2e\ud835\udc2c\ud835\udc28\ud835\udc22\ud835\udc25 \ud835\udc1a\ud835\udc2e \ud835\udc02\ud835\udc21\u00e2\ud835\udc2d\ud835\udc1e\ud835\udc1a\ud835\udc2e \ud835\udc12\ud835\udc1a\ud835\udc22\ud835\udc27\ud835\udc2d-\ud835\udc01\ud835\udc1a\ud835\udc2b\ud835\udc2d\ud835\udc21\u00e9\ud835\udc25\ud835\udc1e\ud835\udc26\ud835\udc32, \ud835\udc1e\ud835\udc27 \ud835\udc12\ud835\udc2e\ud835\udc22\ud835\udc2c\ud835\udc2c\ud835\udc1e.<\/p>\n
Dans le cadre de la restauration du Ch\u00e2teau Saint-Barth\u00e9lemy, Medusoil a contribu\u00e9 en 2025 \u00e0 une premi\u00e8re phase de travaux d\u2019am\u00e9lioration des sols visant \u00e0 renforcer et \u00e0 stabiliser les terrains situ\u00e9s sous et autour des fondations de cet \u00e9difice historique.<\/p>\n
Les investigations g\u00e9otechniques ont r\u00e9v\u00e9l\u00e9 un sous-sol particuli\u00e8rement h\u00e9t\u00e9rog\u00e8ne, compos\u00e9 de remblais, de limons sableux et d\u2019argiles limoneuses. Certaines de ces couches argileuses pr\u00e9sentent un comportement de retrait\u2013gonflement en r\u00e9ponse aux variations d\u2019humidit\u00e9, susceptible d\u2019engendrer des mouvements diff\u00e9rentiels du terrain et de contribuer \u00e0 la fissuration de la ma\u00e7onnerie historique.<\/p>\n
\ud835\udc14\ud835\udc27\ud835\udc1e \ud835\udc22\ud835\udc27\ud835\udc2d\ud835\udc1e\ud835\udc2b\ud835\udc2f\ud835\udc1e\ud835\udc27\ud835\udc2d\ud835\udc22\ud835\udc28\ud835\udc27 \ud835\udc1c\ud835\udc22\ud835\udc1b\ud835\udc25\u00e9\ud835\udc1e \ud835\udc1e\ud835\udc2d \ud835\udc29\ud835\udc1e\ud835\udc2e \ud835\udc22\ud835\udc27\ud835\udc2d\ud835\udc2b\ud835\udc2e\ud835\udc2c\ud835\udc22\ud835\udc2f\ud835\udc1e<\/p>\n
Pour r\u00e9pondre \u00e0 ces conditions tout en respectant le caract\u00e8re patrimonial du ch\u00e2teau, Medusoil a mis en \u0153uvre par injection sa solution de biocimentation BCEM I (BioSlurry).<\/p>\n
Le traitement a \u00e9t\u00e9 r\u00e9alis\u00e9 le long de la fa\u00e7ade est jusqu\u2019\u00e0 une profondeur de 3 m\u00e8tres. Les injections ont \u00e9t\u00e9 effectu\u00e9es \u00e0 tr\u00e8s faible pression, environ 0,5 bar, ce qui a permis \u00e0 la solution de suivre naturellement les chemins hydrauliques pr\u00e9f\u00e9rentiels sans imposer de contrainte m\u00e9canique significative \u00e0 la structure.<\/p>\n
Cette approche visait \u00e0 r\u00e9duire les h\u00e9t\u00e9rog\u00e9n\u00e9it\u00e9s hydro-m\u00e9caniques du terrain, \u00e0 traiter les chemins d\u2019infiltration pr\u00e9f\u00e9rentiels et \u00e0 am\u00e9liorer la stabilit\u00e9 des sols superficiels supportant les fondations.<\/p>\n
\ud835\udc0b\ud835\udc1e \ud835\udc2c\ud835\udc2e\ud835\udc22\ud835\udc2f\ud835\udc22 \ud835\udc1d\ud835\udc2e \ud835\udc2d\ud835\udc2b\ud835\udc1a\ud835\udc22\ud835\udc2d\ud835\udc1e\ud835\udc26\ud835\udc1e\ud835\udc27\ud835\udc2d \ud835\udc29\ud835\udc1a\ud835\udc2b \ud835\udc26\u00e9\ud835\udc2d\ud835\udc21\ud835\udc28\ud835\udc1d\ud835\udc1e\ud835\udc2c \ud835\udc20\u00e9\ud835\udc28\ud835\udc29\ud835\udc21\ud835\udc32\ud835\udc2c\ud835\udc22\ud835\udc2a\ud835\udc2e\ud835\udc1e\ud835\udc2c<\/p>\n
L\u2019intervention a \u00e9galement comport\u00e9 un programme de suivi non destructif combinant g\u00e9oradar (GPR) et tomographie de r\u00e9sistivit\u00e9 \u00e9lectrique (ERT).<\/p>\n
Les mesures g\u00e9oradar r\u00e9alis\u00e9es avant et apr\u00e8s injection ont montr\u00e9 des variations localis\u00e9es du signal au sein des zones trait\u00e9es, avec des r\u00e9flecteurs plus lisses et une r\u00e9duction des anomalies de petite \u00e9chelle, indiquant une homog\u00e9n\u00e9isation progressive de la structure du sol. \u00c0 environ un m\u00e8tre des axes d\u2019injection, peu ou pas de changement significatif n\u2019a \u00e9t\u00e9 observ\u00e9, confirmant que le traitement est rest\u00e9 localis\u00e9.<\/p>\n
Les mesures ERT compl\u00e9mentaires ont apport\u00e9 un \u00e9clairage suppl\u00e9mentaire sur l\u2019h\u00e9t\u00e9rog\u00e9n\u00e9it\u00e9 du sous-sol et ont permis d\u2019identifier les chemins hydrauliques pr\u00e9f\u00e9rentiels. Ces r\u00e9sultats constituent \u00e9galement une r\u00e9f\u00e9rence pr\u00e9cieuse pour affiner le ciblage et le suivi des futures phases du projet.<\/p>\n
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Ce projet d\u00e9montre comment les technologies de biocimentation peuvent \u00eatre int\u00e9gr\u00e9es \u00e0 des interventions g\u00e9otechniques sur des ouvrages sensibles et historiques.<\/p>\n
En combinant injection \u00e0 basse pression, traitement cibl\u00e9 du terrain et suivi g\u00e9ophysique non destructif, Medusoil contribue au d\u00e9veloppement de nouvelles approches du renforcement des sols, tout en r\u00e9pondant aux contraintes sp\u00e9cifiques des b\u00e2timents patrimoniaux.<\/p>\n
Le projet a \u00e9t\u00e9 r\u00e9alis\u00e9 avec la Fondation St. Barth\u00e9lemy, en collaboration avec K\u00e4lin & Associ\u00e9s et Marti.<\/p>\n