Measurement techniques for in situ stresses around underground constructions in a deep clay formation

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Abstract

Disposal in deep underground geological formations is internationally recognized as the most viable option for the long-term management of high-level radioactive waste. In Belgium, the Boom clay formation is extensively studied in this context, in particular at the 225 m deep HADES Underground Research Facility in Mol. An accurate assessment of the in situ stresses is essential from both a scientific (safety studies) and a technical (engineering) perspective. Different measurement techniques are available to provide data on the stress evolution and other mechanical properties of the geological formation. The measurement can be direct (measurement of total pressure), or it can be an indirect technique, deriving the stress from related quantities such as strain (changes) in structural members. Most total stress measurements are performed through permanently installed sensors; also once-only measurements are performed through specific methods (e.g. pressuremeter). Direct measurement of the stress state is challenging due to the complex mechanical behaviour of the clay, and the fact that the sensor installation inevitably disturbs the original stress field. This paper describes ways to deal with these problems and presents the results obtained using different techniques at HADES

Details

Original languageEnglish
Title of host publicationProceedings 14th International Conference on Experimental Mechanics (ICEM 14)
Place of PublicationPoitiers, France
Pages1-8
Publication statusPublished - Jul 2010
EventICEM 14 - EuraSEM, Poitiers, FRANCE, July 4-9, France
Duration: 4 Jul 20109 Jul 2010

Conference

ConferenceICEM 14
CountryFrance
CityPoitiers, FRANCE, July 4-9
Period2010-07-042010-07-09

Keywords

  • Total stress, Instrumentation, Boom clay, HADES, Monitoring

ID: 273052