Study on Deformation and Fracture of Rock-like Specimens with Parallel Fissure Groups Under Uniaxial Compression:Combining Sand 3D Printing and DIC Technology
ZHANG Kai1, ZHANG Ke2, BAO Rui3,4,*, YANG Yi5
1 Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming 650500, China 2 Faculty of Electric Power Engineering, Kunming University of Science and Technology, Kunming 650500, China 3 Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China 4 Kunming Prospecting Design Institute of China Nonferrous Metals Industry Co., Ltd., Kunming 650051, China 5 Faculty of Public Safety and Emergency Management, Kunming University of Science and Technology, Kunming 650093, China
Abstract: Parallel fissure groups, as a common defect distribution pattern in rock masses, are critical to the safety and stability assessment of rock engineering. In this study, rock-like specimens containing parallel fissure groups at different inclination angles were prepared by sand 3D printing technology, and the crack coalescence, propagation and failure modes of the specimens under uniaxial compression were analyzed by using di-gital image correlation (DIC) technology. The results show that as the inclination angle of the fissure group gradually increases, the average peak strength and average elastic modulus of the sand 3D printed specimens show a trend of decreasing and then increasing. The coalescence patterns between pre-fabricated fissures of the specimen can be categorized into nine, with fewer coalescence patterns existing between the fissures as the inclination angle of the fissure group increases. The failure modes of sand 3D printed specimens with parallel fissure groups can be categorized into four types with the change of angle, which are “X” type failure starting from the center fissure, step symmetric failure along the pre-fabricated fissure surface, shear failure along the pre-fabricated fissure surface, and side splitting failure. The findings provide a reference for understanding the deformation and fracture mechanism of fissured rock masses, and expand the application of sand 3D printing technology in the reconstruction of complex fissured rock masses.
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2026, Vol. 40 
