Damage constitutive model of jointed rock mass and engineering application

According to the structural characteristics of fractured rock mass and the geometric damage theory, a damage matrix was cited to describe the deterioration of rock mass due to cracks. The deterioration of rock mass constitutive model based on Mohr-Coulomb criterion was deduced. Taking FLAC(3D) as the development platform, the constitutive model was compiled on the VC++ environment and secondary development of FLAC(3D) was realized. In the end, the surrounding rock stability of the underground cavern group of Shuangjiangkou hydropower station was simulated by using the development program. And the results were compared with the ones obtained from the computation with elastic-plastic model. According to the comparative results, the model was basically reasonable. Meanwhile, the research achievement was put forward for the stability and security of underground cavern group.