A MICROMECHANICAL APPROACH OF ANISOTROPIC DAMAGE:FORMULATION AND COMPUTATIONAL ASPECTS
The present study is devoted to the formulation of a new micromechanical damage model for quasi brittle geomaterials and its numerical implementation and application for the determination of an EDZ (Excavation Disturbed Zone). We first present the basic principles of Eshelby-based homogenization methods and their applications to microcracked materials. The homogenization framework is then used to develop a micromechanics-based anisotropic damage model. Furthermore, an extended version of the model is developed by coupling the anisotropic damage with friction which occurs on closed cracks. Identification of the micromechanical model requires only 6 parameters with clear physical meaning. These parameters can be determined from laboratory standard tests and are calibrated in the present study for a granite. Comparisons of the model predictions with experimental data are performed on multiaxial loading paths. Furthermore, the micromechanical model is easily implemented in the Finite Element software ABAQUS. Application to an underground excavation problem shows a good agreement between numerical results and in situ data concerning radial displacement and the EDZ.
Qizhi Zhu Djimedo Kondo Jianfu Shao Vincent Pensee
Laboratoire de Mécanique de Lille, UMR8107 CNRS, USTL, Lille, France Laboratoire de Mécanique -LaM, Université de Mame-la-Vallée, France
国际会议
南京
英文
44-51
2006-05-22（万方平台首次上网日期，不代表论文的发表时间）