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2018-09-11 - Colloque/Article dans les actes avec comité de lecture - Anglais - 4 page(s)

Dupont Nicolas , Martin Thierry , Kaufmann Olivier , "Detection of buried mine shafts by ground conductivity mapping - two examples from the Walloon coalfield (Belgium)" in Near Surface Geoscience, Porto, Portugal, 2018

  • Codes CREF : Sciences de l'ingénieur (DI2000), Prospection minière et pétrolière (DI2321), Géologie (DI1411), Aménagement du territoire (DI1473), Exploitation des mines et carrières (DI2320)
  • Unités de recherche UMONS : Géologie fondamentale et appliquée (F401)
  • Instituts UMONS : Institut des Sciences et du Management des Risques (Risques)

Abstract(s) :

(Anglais) The presence of numerous buried mine shafts in Wallonia (South Belgium) causes significative post-mining hazards and geotechnical risks. Recently, the locations of thousands of buried mine shafts have been estimated with some uncertainties. To eliminate these uncertainties, the most suitable solution is to relocate precisely the buried mine shafts. Geophysical surveys could provide an efficient way to detect such buried mine shafts. However, the applicability depends on the local context and needs to be assessed. In our study, we applied ground conductivity mapping to detect and locate buried mine shafts expected within two distinct sites (Sambreville and La Louvière). The application of this method gave very convincing results, with some nuance according to the site geology and to the mine shaft abandonment (backfilling or not). In addition, a significant number of unknown mine shafts was also discovered. In the future, development projects in these areas could benefit from investigations such as the ones presented here. This is why this work could be seen as a milestone in dimensioning ground conductivity surveys to detect buried mine shafts in the regional context of the Walloon coalfield.