Study of the deformation of a salt massif close to underground cavities
The present report describes the in situ tests carried out in the Varangéville mine (France). This work is part of a larger research programme on the mechanical behaviour of a salt massif, carried out by BRGM and Ecole des Mines de Paris.. The aim of the in situ tests was to collect data for the validation of the behaviour law, based on the laboratory tests. Those tests consisted on the one hand of the short term mechanical characteristics measurement and on the other hand of the long term creep measurement of borehole walls. The second part required the construction of a prototype designed to measure the creep of borehole walls while applying a constant internal pressure set to a chosen value. The tests were carried out in a pillar of the mine. At first examination, the results seem to be inconsistent with the results of the modelling carried out by EMP with the VIPLEF code. It must be concluded that the mechanical characteristics of the massif near the borehole are modified as a result of the drilling; this appears probable from the fissure relaxation observed in the cores. The global modelling, taking into account both the laboratory tests and the in situ tests results should allow a better understanding of the behaviour of this rock salt.
Bibliographic Reference: EUR 14377 FR (1992) 88 pp., FS, ECU 10.50
ISBN: ISBN 92-826-3696-8
Record Number: 199211180 / Last updated on: 1994-11-29
Original language: fr
Available languages: fr