The hydromechanical behaviour of the Boom Clay observed during excavation of the connecting gallery at Mol site

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Abstract

Boom Clay formation has been selected as a potential host rock for the geological disposal of radioactive wastes in Belgium. An Underground Research Facility (URF) in Boom Clay formation at a depth of about 223m at Mol site was built to investigate and demonstrate the feasibility of the disposal concepts and to provide reliable data on the performance of Boom Clay as a host rock. The URF was extended by sinking a second shaft and excavating a connecting gallery that provided a unique and original opportunity to monitor the hydromechanical responses of the Boom Clay ahead of the excavation front thanks to the instrumentation installed in-situ (CLIPEX program). The most important observation is the very extended excavation dis-turbed zone that cannot be replicated by a classical elasto-plastic constitutive law, which gave however reli-able predictions of instantaneous convergence in the near field. Further investigation is necessary to explain this extended disturbed zone, especially variation of pore water pressure in the far field.

Details

Original languageEnglish
Title of host publicationEUROCK 2006, Multiphysics coupling and long term behaviour in rock mechanics;
Place of PublicationLondon, British Indian Ocean Territory
Pages467-472
Volume1
Publication statusPublished - 12 May 2006
EventEUROCK 2006, Multiphysics coupling and long term behaviour in rock mechanics; - Belgian Rock mechanics society, Liège, Belgium
Duration: 9 May 200612 May 2006

Publication series

NameProceedings and Monographs in Engineering, Water and Earthe Sciences

Conference

ConferenceEUROCK 2006, Multiphysics coupling and long term behaviour in rock mechanics;
CountryBelgium
CityLiège
Period2006-05-092006-05-12

Keywords

  • Boom clay, geological disposal, excavation disturbed zone, near field, far field, constitutive law

ID: 325674