The paper describes a numerical modelling procedure which has been recently implemented in the Finite Difference code FLAC, with the main purpose to simulate the squeezing behaviour in tunnels. A stress-strain law is applied which considers three different stages of behaviour the elastic stage, up to the onset of time dependent deformations; the hardening stage, which is intended to represent the terminal locus of long-term creep deformations; the softening stage. The results of a validation exercise of typical stress-strain laws obtained in triaxial compression tests and for the stress-strain distribution around a deep circular tunnel are briefly discussed.
The paper descri …
AUTORI: Barla G., Borgna S. RIG ANNO: 1999 NUMERO: 1 Numero di pagina: 46