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Geomechanical measurements have been performed in boreholes drilled from a gallery, 750 m below the surface in the Asse salt mine. The drilling depth varied between 300 m and 500 m and the diameter of the holes was 600 mm. Measurements were taken of the free convergence borehole wall and the mechanical response of the wall to pressure load. It appears that the in situ elastic modulus is significantly higher than the value previously used by ECN. Based on this revised modulus of elasticity, a new set of parameters for the description of the time dependent behaviour of Asse rock salt has been derived. An evaluation has been made of recent free convergence measurements in a newly developed 500 m deep borehole. Preliminary results suggest that the creep law as presented in this report may require revision when more data become available.

Additional information

Authors: HEIJDRA J J, ECN, Petten (NL);PRIJ J, ECN, Petten (NL)
Bibliographic Reference: EUR 16485 EN (1995) 29 pp., FS, ECU 7
Availability: (2)
ISBN: ISBN 92-827-4345-4
Record Number: 199510836 / Last updated on: 1995-08-03
Original language: en
Available languages: en
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