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In these studies the aim was to assess the extent of zones affected by changing stress conditions around tunnels or boreholes in granite formations, and to determine the nature and degree of rock fissuring caused by such works. The studies were based on a programme of samplings and on a selection of methods to characterise fissuring in the samples. Two complementary methods were developed to study granite microfissuring: the high-pressure impregnation of rock samples with dyed resin, and mercury porosimetry. These showed that progressive change in the granite causes growth of the porous network, although the depth does not significantly affect the dimensional measurements obtained. This work was followed by a study and application of special techniques: the in situ impregnation of dyed resins injected immediately after drilling, followed by large-diameter core sampling; and a technique of sampling in trial boreholes, which enabled very large core samples to be taken and produced high-quality holes with clean-cut walls.

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Authors: BOISSON J Y, CEA, CEN Fontenay-aux-Roses (FR);DERLICH H S, CEA, CEN Fontenay-aux-Roses (FR)
Bibliographic Reference: EUR 15185 FR (1994) 236 pp., FS, ECU 28
Availability: (2)
ISBN: ISBN 92-826-8666-3
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