MICROMECHANICAL COUPLING MODEL BETWEEN STRESS-BASED ANISOTROPIC DAMAGE AND PERMEABILITY iN BRITTLE ROCKS
A three dimensional micromechanical constitutive model for coupled stress-based anisotropic damage and permeability variation is proposed. Its considered that the damage in brittle rocks is a result of microcracks opening, sliding and spreading, and the variation of permeability is also a consequence of microcracks opening and growth. In the proposed model the density of anisotropic microcracks is regarded as the variable of damage. The macroscopic free complementary energy based on macroscopic stress is derived, and the damage evolution is related to the microcrack growth in multiple orientations using the concept of energy release rate in fracture mechanics. The permeability of brittle rock, which varies as a result of microcracks opening, spreading, and connectivity increases, is derived from Darcys law and modified hydraulic cubic law, then a homogenization method is used to achieve a overall permeability. The proposed model is applied to the French Lac du Bonnet granite. The numerical simulations and experimental data agree fairly well.
Tao Jiang Weiya Xu J.F.Shao Shengqi Yang
Research Institute of Geotechnical Engineering, Hohai University,Nanjing210098,P.R.China LML, Univer Research Institute of Geotechnical Engineering, Hohai University, Nanjing210098,P.R.China LML, Universite des Sciences et Technologies de LILLE France
国际会议
南京
英文
37-43
2006-05-22（万方平台首次上网日期，不代表论文的发表时间）