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Abstract

This research item focuses on in situ investigations related to the (thermo-) mechanical behaviour of clay. Three main items are covered: - stress measurements using hydraulic stress monitoring stations; - detection of micro-fractures in the clay host, mainly using geophysical seismic techniques; - long term mechanical behaviour of clay. This report describes the investigations carried out and results recorded by SCK/CEN for the two first items. The stress monitoring stations appear to be more reliable in measuring relative pressure variations with time rather than absolute values of stress, even after studying and improving the characteristics of the surrounding grout. The seismic techniques used appear to be sensitive and accurate enough for detecting induced fracturation in the clay host, even for the low temperature gradients assumed; this is in agreement with laboratory measurements on clay samples intended to quantify the influence of both temperature and consolidation on the velocity.

Additional information

Authors: NEERDAEL B, SCK/CEN, Mol (BE);BEAUFAYS R, SCK/CEN, Mol (BE);BUYENS M, SCK/CEN, Mol (BE);DE BRUYN D, SCK/CEN, Mol (BE);VOET M, SCK/CEN, Mol (BE)
Bibliographic Reference: EUR 14154 EN (1992) 109 pp., FS, ECU 12
Availability: (2)
ISBN: ISBN 92-826-4061-2
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