On micromechanical damage modeling in geomechanics: Influence of numerical integration scheme

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摘要

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.

论文关键词:Anisotropic damage,Initial stresses,Micromechanics,Microcracked geomaterials,Tunnel excavation,Numerical integration

论文评审过程:Received 31 January 2012, Revised 30 April 2012, Available online 31 May 2012.

论文官网地址:https://doi.org/10.1016/j.cam.2012.05.022