Hydraulic conductivity of Boom Clay in north-east Belgium

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Abstract

Hydraulic conductivities of Boom Clay measured on samples of a few centimeters through various testing techniques in the laboratory exhibit similar K values in the order of 10-12 m/s. In situ measurements obtained at various scales at the HADES underground research facility yield K values that are very similar. Analysis of K values across the Boom Clay at the Mol site reveals a typical profile with a very homogenous 61-m thick central part (the Putte and Terhagen Members), which is also the least permeable part of the Boom Clay. The geometric mean of the vertical (Kv) and horizontal (Kh) hydraulic conductivities for these members at the Mol site are 1.7×10-12 and 4.4×10-12 m/s, respectively, with a vertical anisotropy Kh/Kv of about 2.5. Higher K values, but still low (10-12 to 10-10 m/s), are observed in the more silty zones above and below. A regional analysis of vertical K variability of the Boom Clay in the northeast of Belgium confirms this typical K profile of the Boom Clay based on test results from other four regional boreholes. Furthermore, an increase in overall Boom Clay vertical hydraulic conductivity from the east towards the west in north-east Belgium was observed.

Details

Original languageEnglish
Title of host publicationPropriétés de transfert des géomatériaux TRANSFERT 2012. Actes du colloque
Place of PublicationLille, France
Pages408-417
StatePublished - Mar 2012
EventTransfert 2012 - Lille, France

Conference

ConferenceTransfert 2012
CountryFrance
CityLille
Period2012-03-202012-03-22

Keywords

  • North-east Belgium, geological disposal of radioactive waste, low permeable clay, measurement of hydraulic conductivity, grain-size

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