Experimental and numerical modeling of deformation-cracking mechanics of 3D-printed rock samples with single fracture

The analysis of mechanical response and deformation-cracking behavior contributes to the high-efficiency extraction geo-energy long-term safety underground engineering structures. Compared natural cores, properties 3D-printed samples made from quartz sand as raw material are relatively homogeneous, can be used for quantitative studies on influence defects rocks. In this work, with single fractures different crack angles, lengths widths were fabricated uniaxial compression tests. Adopting digital image correlation method, stress-strain distribution during tests visualized, prefabricated fracture characteristics (dip angle, length, width) deformation-failure process studied. An extended finite element method subroutine ABAQUS® software was modeled simulation, which validated by experiments. Then, parameters (Young’s modulus, Poisson’s ratio, cohesion, internal friction angle) mechanics simulated results indicate that, compared intact sample, reduce sample strength. With extension length width, or decline both peak strain strength decrease. splitting tensile failure, shear determined angles. For same axial strain, new increases linearly rising Young’s modulus decreases increasing ratio. initial cracks while little variations found in displacement load, stress growing angle cohesion. Cited as: Song, R., Tian, J., Wu, M., Liu, J. Experimental numerical modeling rock fracture. Advances Geo-Energy Research, 2023, 8(2): 126-135. https://doi.org/10.46690/ager.2023.05.06