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2019-06-20 - Travail avec promoteur/Projet d'étudiant - Anglais - page(s)

Georgieva Temenuga Dimova , "Rock mechanics project: Mechanical characterization of phosphatic chalk in the framework of the stability assessment of Malogne underground quarry", 2019-06-20

  • Codes CREF : Mécanique des roches (DI1418)
  • 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)

Abstract(s) :

(Anglais) This work has been carried out at the Mining Engineering Department at Polytech Faculty, the University of Mons under the supervision of Prof. Jean-Pierre TSHIBANGU, Prof. Sara VANDYCKE, Ir. Ph.D. Fanny DESCAMPS and Ir. Nicolas GONZE. The work provides a geomechanical characterization of a shallow underground quarry, named “Malogne”, located in the area of Mons (Cuesmes), Belgium. It is conducted in the framework of INTERREG project “RISSC” and a doctoral formation program at UMONS, which is a partner in the “RISSC” project. The Malogne underground quarry is situated in the central part of the Mons sedimentary Basin, in the area of the Cuesmes village, Mons district. The deposit is with Late Cretaceous age and has been exploited due to the content of phosphate in the chalk of the geological formation known as “Craie Phosphatée de Ciply”. It has been extracted by rooms and pillars mining method at a shallow depth. The main objective of the study presented herein is to investigate the rock mass properties of the Ciply phosphatic chalk formation, extracted in the Malogne underground quarry, in a dry and saturated state that will allow to evaluate the influence of the water on the chalk properties and later on its influence on the overall stability of the pillars in the quarry. Thus, a prediction of the behavior of the underground cavities can be made. A complex of in-situ and lab analysis that was carried out includes structural survey, RQD measurement, thin section petrography, uniaxial compression tests, Brazilian tests, shear tests, punching test, cutting test, and polyaxial tests of the representative for the quarry lithotypes that form its rooms and pillar walls and hangingwall - phosphatic chalk and hardground. In order to understand deeper the behavior of the rock mass in an abandoned underground quarry and to assess the stability of the underground openings, geomechanical characterization of the rock mass has been carried out. The results of the study will be used for performing a numerical modeling of the quarry. This will help for understanding the stability of the quarry as well as to examine how behavior changes as the water involved.