Experimental study on biaxial dynamical compressive test and PFC2D numerical simulation of artificial rock sample with single joint

• Published in: Archives of civil engineering 2023-01, Vol.69 (1), p.213-229
• Main Authors: Liangxiao, Xiong, Chen, Haijun, Gao, Xinghong, Xu, Zhongyuan, Hu, Deye
• Format: Article
• Language: English
• Subjects: artificial rock specimen; Axial stress; biaxial dynamic compression; Cement; Civil engineering; Compression tests; Compressive strength; crack evolution aw; Crack initiation; Evolution; Experiments; Laboratories; Lateral stress; Load distribution; Loading rate; Mechanical properties; Mortars (material); Rocks; Simulation; Vertical loads
• ISSN: 1230-2945; 2300-3103
• DOI: 10.24425/ace.2023.144169

Dynamic biaxial compression tests and Particle Flow Code numerical simulations of the cement mortar specimens with a single joint were carried out to study the mechanical properties and crack evolution of artificial rock samples with a single joint. The effects of lateral stress ??2, loading rate V , the dip angle β (between the vertical loading direction and the joint) on the biaxial compressive strength ?? b, and the evolution lawof crackwere investigated. Test results showed that; (1) when both the dip angle β and the loading rate V remained unchanged, the biaxial compressive strength ?? b increased with the increase in the lateral stress ??2, while ??2 had no obvious effect on the crack evolution law; (2) when both the dip angle β and the lateral stress ??2 were kept unchanged, the loading rate V had an insignificant effect on the biaxial compressive strength ?? b and the crack evolution law; (3) when both the lateral stress ??2 and the loading rate V were constant, the biaxial compressive strength ?? b decreased first and then increased with the increase in the dip angle β ; however, the dip angle β did not significantly affect the crack evolution law. The conclusions obtained in this paper are presented for the first time.