A Damage Constitutive Model for The Intermittent Cracked Rock Mass Under the Planar Complicated Stress Condition

The calculation of rock mass damage induced by the intermittent crack is the premise for establishment of the rock mass damage constitutive model (DCM). However, there are two shortcomings in the previous calculation methods of the rock mass damage: (a) it only considers the crack geometry or strength parameters, and does not consider its deformation parameter such as normal and shear stiffness; and (b) the influence of loading condition of the rock mass is not considered. This study focuses on intermittent cracked rock mass under the planar complicated stress condition and calculates its damage tensor. The proposed calculation method of rock mass damage considers the crack parameter such as length, dip angle, internal friction angle, normal and shear stiffness (internal factor) as well as the loading condition (external factor). The corresponding DCM for the intermittent cracked rock mass is then set up. The calculation examples validate that the proposed model can reflect the influence of crack parameter and loading condition on the rock mass mechanical behaviour.