Dynamic Strength and Dynamic Fracture Criteria of Rock and Rock Mass

Abstract:

The paper presents a theoretical study of the temporal features of deformation and fracture of rock and rock mass and an investigation of the strain rate dependence of strength and its mechanism.The paper also presents the Mohr-Coulomb constitutive relations with a consideration of strain rate dependence and the relationship between the size of blocks of fractured rock mass and the strain rate.Several temporal fracture criteria are discussed,and their intrinsic relationship is revealed.Finally,the application of dynamic strength theories is discussed.

Key words:rock and rock mass,deformation and fracture,temporal factor,dynamic strength,criteria of fracture