Numerical modeling and mechanical parameters determination of jointed rock mass

A ubiquitous jointed rock mass(UJRM) model constructed by combining the FLAC3D software and discrete fracture network(DFN) technique,which takes the features of rock and joints into account,has a clear concept,high efficiency of modeling and calculation,and so on. Firstly,the in-situ survey results of joints were statistically analyzed to obtain their probability distribution parameters,on the basis of which the joints were considered in two scales and their DFN models were determined. Secondly,based on the determined DFN models,the jointed rock mass was modeled and the strength characteristics were researched to get the uniaxial compressive strength(UCS) of engineering rock mass,then the mechanical parameters of jointed rock mass were fitted and determined by the Hoek-Brown and Mohr-Coulomb criteria while considering the max confining stress. Finally,the determined parameters were applied to slope stability analysis,the safety factors of the two kinds of criterions solved by the limit equilibrium method(LEM) and the strength reduction method(SRM) are basically the same,indicating that using the proposed approach to determine the mechanical parameters of jointed rock mass is practicable.