Research on damage constitutive model of rock under dynamical load based on statistical theory

Firstly, based on the statistical character of strength, rock micro-unit was abstracted into the parallel connection of elastic damage body and viscous body, and then a new statistical damage constitutive model of rock under dynamical load is deduced according to the working character of rock under dynamical load. Compared to the normal methods, the new model has relative had less parameters and is simple and easy to application, and can consider the influence of surrounding pressure to deformation characteristic of rock, even can depict the curve after crest point of rock failure proceeding perfectly. Combined with laboratory tri-axial test, the calculated results and measured data are in an good agreement.