Experimental And Numerical Study Of Damage Evolution In Rock-like Materials Based On The Energy Dissipation Principle

Due to effects of natural conditions (such as weathering, crustal movement, human activities, etc.), there are a large number of joints and fissures in rock mass, which are uneven distributed and have large difference from each other. The joints and fissures in rock mass would constitute a major threat to the rock engineering strength, deformation and life.In this paper, using a definition based on the theory of energy dissipation to analysis the stress-strain curves of rock-like materials under uniaxial compression, the test results:damage will have a large increase due to the pre-existing crack; damage evolution with different arranged cracks would produce different degrees of difference under uniaxial compression; damage evolution have close relation with the fracture mode.Application of damaged plasticity model based on ABAQUS finite element program to simulate models with pre-existing cracks under uniaxial compression, the results show that: compression damage and tensile damage at crack tip decrease with increasing crack thickness, and increase with increasing crack length; crack initiation angle increases more quickly with increasing crack angle than increasing crack thickness and length.