A viscoplastic model for soft rock

Abstract

The aim of the model is to represent the main features of soft or brittle rock strata, using a small number of physically‐meaningful material parameters. The yield surface is based on either the Mohr—Coulomb or Hoek—Brown criterion, and a simple small‐dilation flow rule allows the implicit algorithm of elasto‐viscoplasticity to be used. Elastic—brittle plastic behaviour is modelled, resulting in stress discontinuities across the interface between intact and failed rock. The effects of lamination and jointing are taken into account. Results are presented for a tunnelling problem with axial symmetry.

Citation

Reed, M.B. (1988), "A viscoplastic model for soft rock", Engineering Computations, Vol. 5 No. 1, pp. 65-70. https://doi.org/10.1108/eb023722