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ABSTRACT In engineering construction, the presence of internal fissures in rock masses and the accumulation of internal energy are the main factors affecting rock failure. To study the effects of fissures and borehole pressure relief on rock masses separately, this paper has prepared various drilling samples with different fissures in the laboratory. On the basis of maintaining the original number of fissures, new fissures and holes are added to explore their effects on the rock mass. Combined with discrete element numerical simulation, the microscopic characteristics of multi‐fissure samples and borehole samples are analyzed. The research results indicate that as the fissure dip angle increases, failure occurs gradually along the existing fissures, while the crack development in the borehole samples is mainly concentrated around the holes, and the boreholes have a greater impact than fissures. The study of the change rule and damage characteristics of the fissures before and after drilling of multi‐fissure specimens can provide a reference for controlling the deformation of the rock mass in engineering applications.
Chen et al. (Tue,) studied this question.