DDARF (discontinuous deformation analysis for rock failure) has successfully realized the simulation on crack initiation

propagation

penetration and crushing of rock mass; but this algorithm only considers the linear elastic constitutive model and doesn’t analyze the nonlinear stress-strain relationship of rock mass. For more accordding to the real rock engineering

and expanding the application scope of DDARF’s nonlinear constitutive model

Mohr-Coulomb strength criterion and the maximum tensile stress strength criterion are respectively used to judge shear and tensile damage for rock mass; the algorithm of ideal elastic brittle constitutive model is analyzed

and is programmed based on VC + + platform. Custom DDARF elastic brittle constitutive model for rock mass is comparatively analyzed with the laboratory uniaxial compression test; DDARF elastic brittle constitutive model is applied to large underground cavern excavation

and compared with the linear elastic constitutive model. Results show that

custom elastic brittle constitutive model for rock mass of DDARF is feasible; this elastic brittle constitutive model can reflect the nonlinear deformation characteristics of rock mass

and coincides with the laboratory experiment well. DDARF elastic brittle constitutive model is applied to large underground engineering

the stability of the surrounding rock mass can be more safely and truly analyzed

and the protective measures of underground caverns can be well guided.