Study of the different behaviour of deep clays
The aim of the work presented in this report is to study the time-dependent behaviour of deep clays in laboratory or in situ by means of tests of similar geometry, in order to get easy comparisons and to study scale effect. The cylindrical geometry has been chosen as it resembles in situ works (tunnels, galleries) more closely. The first part of the study concerns a new test on the hollow-cylinder, to obtain experimentally the short- and long-term convergence curves for the Boom clay. In the second part of the report devoted to in situ creep or relaxation dilatometer tests, by using new techniques or loading paths, it was shown that time-dependent convergence of boreholes can reach significant values, and is dependent on the direction of the borehole; therefore, the anisotropy of the initial state of stress was considered. The proposed constitutive model (part III) appears to be very suitable to explain the behaviour of the Boom clay, in view of the experimental results. In particular, scale effect is low for Boom clay.
Bibliographic Reference: EUR 14438 FR (1993) 146 pp., FS, ECU 15
ISBN: ISBN 92-826-5205-X
Record Number: 199310412 / Last updated on: 1994-11-29
Original language: fr
Available languages: fr