Numerical verification of failure characteristics of brittle rock specimens containing two-dimensional and three-dimensional prefabricated cracks
To simulate the real failure behavior of primary fractures in rock mass,a discrete element simulation study was carried out based on the uniaxial compression test of rock-like samples containing two-dimensional and three-dimensional prefabricated fractures.The experimental and simulation results showed that the internal secondary faults appeared firstly in the lower part of the built-in two-dimensional fractures and around the three-dimensional fractures,and the secondary tensile cracks and prefabricated fractures were completely parallel and distributed in strips in the strike direction.Increase in cleavage dip had different effects on the destruction of rock sample.With the gradual decrease of the dip angle of the fracture,the secondary tensile cracks became more and more obvious,the curvature of the wing cracks became larger and larger,and the distribution range of tensile crack clusters near the built-in three-dimensional fractures became larger and larger.At the same time,the occurrence of secondary shear cracks also became more and more obvious with the decrease of the crack inclination angle,the connectivity was enhanced,and the sample was more prone to failure,indicating that the strength of the specimen decreased with the decrease of the inclination angle of the prefabricated fracture within a certain range.
built-in 3D cleavageacoustic emissionPFC 3D simulationparticle displacement vector fieldcleavage development mechanism
万方数据
维普
