An overview of long-term HM measurements around HADES URF

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Abstract

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.

Details

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
Pages15-26
Volume1
Publication statusPublished - 9 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

  • long-term measurements, geomechanics, Boom Clay, HADES, coupling

ID: 110860