On micromechanical damage modeling in geomechanics: influence of numerical integration scheme. (English) Zbl 1429.74083

Levasseur, S.; Collin, F.; Charlier, R.; Kondo, D.

J. Comput. Appl. Math. 246, 215-224 (2013).

Summary: Tunnel excavations in deep rocks provide stress perturbations which initiate diffuse and/or localized damage propagation in the material. This damage phenomenon can lead to significant irreversible deformations and changes in rock properties. In this paper, we propose to model such behavior by considering a micromechanically-based damage approach. The resulting micromechanical model, which also accounts for initial stress, is described and assessed through the numerical analysis of a synthetic tunnel drilling in Opalinus Clay. A particular emphasis is put on the numerical integration of the model. In particular, an appropriate choice of the latter is required to ensure the numerical stability and a confident prediction of excavation damaged zone around tunnels.

MSC:

74R20	Anelastic fracture and damage
74L10	Soil and rock mechanics
74S05	Finite element methods applied to problems in solid mechanics
74M25	Micromechanics of solids

Keywords:

anisotropic damage; initial stress; microcracked geomaterials; tunnel excavation; finite element code LAGAMINE