A method for determining cohesion and internal friction angle of dual-pore-fracture medium and the relative FEM analyses
For dual-pore-fracture rock mass,by considering the effect of facture weakening,a method for determining the cohesion cN and internal friction angle (O)N of arbitrary plane in a representative element was suggested.It was proven to be reasonable for the coordination of the anisotropy variation curves of rock mass strength obtained by this and Attewell's methods.Introducing the method for the solving of cN and (O)N into the elastic-plastic FEM code developed by the authors,aimed at a rectangular underground cave,three cases with different fracture states were computed.The results show that with the increasing of fracture set number,the cohesion and internal friction angle of rock mass and the plasticity zone decreased and sharply,nonlinearly grew respectively,and the magnitude and distribution of stress and displacement in the surrounding rock mass changed obviously.
NETL
NSTL
万方数据
维普
