An overview of long-term HM measurements around HADES URF

Wim Bastiaens, Frédéric Bernier, Xiang Ling Li, Jan Verstricht

    Research outputpeer-review


    The underground research facility HADES was constructed to study the feasibility of HLW disposal. Since its operational start 25 years ago numerous instruments were placed in the lining and the surrounding host rock. Some set-ups are operational for over 20 years measuring pore pressure, total pressure or displacements. Displacement measurements enable to assess the displacement during and after excavation works; construction and lining techniques have an influence on the amount of displacement. The short-term response of the host rock put into evidence a strong HM coupling. An anisotropic response and evolution of pore water pressure was observed; this phenomenon was attributed to anisotropy of stress and hydraulic conductivity. The ground pressure on the gallery lining was recorded during several years; it increases fast during the first months after construction and a more gradual increase occurs afterwards. Hydraulic conductivity (k) was measured using several methods at different locations, times and scales. The results of in-situ and laboratory tests are consistent; k is of the order of 10-12 m/s. A hydraulic conductivity increase is observed up to some 6m into the host rock and is attributed to lower effective stress-levels experienced in this zone due to stress-redistribution following the excavation.
    Original languageEnglish
    Title of host publicationProceedings of The Internation Symposium of the International Society for rock Mechanics on Multiphysics Coupling and long Term Behaviour in Rock Mechanics
    Place of PublicationLondon, United Kingdom
    StatePublished - 9 May 2006
    EventEUROCK 2006, Multiphysics coupling and long term behaviour in rock mechanics - Belgian Rock Mechanics Society, Liège
    Duration: 9 May 200612 May 2006

    Publication series

    NameProceedings and Monographs in Engineering, Water and Earthe Sciences


    ConferenceEUROCK 2006, Multiphysics coupling and long term behaviour in rock mechanics

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