Monitoring Large-Scale Tests for Nuclear Waste Disposal |
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Authors: | Eduardo E Alonso Sarah M Springman Charles W W Ng |
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Institution: | (1) Department of Geotechnical Engineering and Geosciences, Universitat Politècnica de Catalunya, c/ Gran Capitán s/n, Módulo D-2, Barcelona, 08034, Spain;(2) Institute for Geotechnical Engineering, Swiss Federal Institute of Technology (ETHZ), Zurich, Switzerland;(3) Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong |
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Abstract: | Two large-scale “in situ” demonstration experiments and their instrumentation are described. The first test (FEBEX Experiment)
involves the hydration of a compacted bentonite barrier under the combined effect of an inner source of heat and an outer
water flow from the confining saturated granite rock. In the second case, the progressive de-saturation of Opalinus clay induced
by maintained ventilation of an unlined tunnel is analyzed. The paper shows the performance of different sensors (capacitive
cells, psychrometers, TDR’s) and a comparison of fill behaviour with modelling results. The long term performance of some
instruments could also be evaluated specially in the case of FEBEX test. Capacitive sensors provide relative humidity data
during long transient periods characterised by very large variations of suction within the bentonite. |
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Keywords: | Field record Case history Bentonite Suction Relative humidity Capacitive sensor TDR sensor Psychrometer Modelling Reliability |
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