Repository tunnel construction in deep clay formations
One of the objectives of the Hades project at Mol, Belgium, has been to evaluate the feasibility of constructing a deep repository in the Boom clay formation at a depth of approximately 225 metres. The main objective of the present project was to analyse and interpret the detailed geotechnical measurements made around the Hades trial shaft and tunnel excavations. Plasticity calculations and finite element analyses were used and gave results consistent with the in-situ measurements. It was shown that effective stress analysis could successfully predict the observed field behaviour. Correct modelling of the small-strain stiffness of the Boom clay was essential for making reasonable predictions of the pore pressure response due to construction. The calculations undertaken indicate that, even in the long term, the pressures on the test drift tunnel lining are likely to be significantly lower than the overburden pressure. Larger long-term tunnel lining pressures are predicted for impermeable linings.
Bibliographic Reference: EUR 13964 EN (1992) 120 pp., FS, ECU 11.25
ISBN: ISBN 92-826-3738-7
Record Number: 199210305 / Last updated on: 1994-12-02
Original language: en
Available languages: en