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2021-10-09 - Colloque/Présentation - communication orale - Anglais - page(s)

Georgieva Temenuga Dimova , "Geoengineering characterization of Lyulyakata limestone quarry, NE Bulgaria" in EuroEngeo, Athens, Greece, 2021

  • Codes CREF : Sciences de l'ingénieur (DI2000), Résistance et comportement des matériaux (DI2110), Mécanique des roches (DI1418), Essais non destructifs (DI2832), Exploitation des mines et carrières (DI2320), Exploitation a ciel ouvert (DI2326)
  • Unités de recherche UMONS : Génie Minier (F408)
  • Instituts UMONS : Institut de Recherche en Science et Ingénierie des Matériaux (Matériaux), Institut des Sciences et du Management des Risques (Risques)
  • Centres UMONS : Ingénierie des matériaux (CRIM)

Abstract(s) :

(Anglais) With its production of several million tons per year the Lyulyakata open pit limestone quarry, located in NE Bulgaria, is the main raw material supplier for soda ash and cement production in the area. The expansion of the quarry in-depth and its long-term sustainable development require an assessment of the possible slope instabilities that are closely controlled by the geological and geomechanical properties of the deposit. Geomechanically the micrite and bio- to lithoclastic limestones are characterized by unconfined compressive strength (UCS) and tensile strength (UTS) tests. The UCS of the bio- to lithoclastic limestone ranges between 24 MPa and 28 MPa while its UTS is between 3 and 5 MPa. In contrast, the micrite samples demonstrate UCS between 98 MPa and 151 MPa. The UTS predominantly varying from 6 MPa to 9 MPa. The moderate strength of the bio- to lithoclastic limestone is explained by its porosity of over 20 % whereas the micrite limestone (porosity 8 %) exhibits a high strength due to its better cementation. The Rock Mass Rating (RMR89) analysis revealed that the massif is classified as Good quality. Only at the near-surface level, due to the impact of the weathering processes, a Fair quality could be expected. The high strength value of the dominant in the quarry micrite limestone and the geometry of the typical for it structural blocks, controlled by lithology and regional geology stress regime, could be used as favorable features for the sustainable extension of the quarry. Following the orientation of the natural rock mass fragmentation from the pit slope will contributes to its sustainable further development.