Brazilian tensile strength test and numerical simulation study of carbonaceous slate with different soft interbedded dips postprint

Abstract: To investigate the influence of weak interlayers on the tensile properties of carbonaceous slate, Brazilian tensile strength tests were conducted on carbonaceous slate containing weak interlayers with different inclination angles. The effects of weak interlayers and their inclination angles on the tensile strength, load-displacement curve, and failure morphology of carbonaceous slate were studied. A cohesion model was established using ABAQUS finite element software for numerical simulation analysis. The research results indicate that the tensile strength of carbonaceous slate with different dip angles of weak interlayers exhibits significant anisotropy. As the dip angle of weak interlayers increases, the tensile strength first decreases and then increases, roughly showing a “U-shaped” distribution. During the splitting process of carbonaceous slate with different dip angles of weak interlayers, the evolution process of axial load with displacement presents three stages: compaction, quasi elasticity, and failure. The failure modes of carbonaceous slate with different dip angles of weak interlayers can be divided into three types: tensile failure, shear failure, and tensile shear failure. The cohesive force model was used to numerically simulate the Brazilian tensile strength test of carbon slate with different weak interlayer angles. The failure morphology and mechanical properties of the model were in good agreement with the test, and were sensitive to the cohesive force unit parameters.