In order to explore the influence mechanism of joint position on rockburst of straight wall arched roadway under dynamic and static loads, the limestone of Huize Lead-Zinc Mine in Yunnan Province was selected and processed into cube specimens with straight wall arched holes. The joints were prefabricated, and the spacing between the joints and the straight wall was 5 mm, 10 mm, 15 mm, and 20 mm, and the jointless specimens were set as the control. Based on the true triaxial rockburst test system, the rockburst simulation tests of roadways with different joint positions were carried out. Combined with video, acoustic emission monitoring, and fractal theory, the influence of joint position on rockbursts was analyzed from the aspects of rockburst failure process, rockburst pit morphology, acoustic emission signal, and debris characteristics. The results show that: (1) The rockburst failure stage of all specimens were same, and the depth of the rockburst pit decreases with the increase of the distance between the joint and the straight wall. (2) The absolute energy of acoustic emission and the fractal dimension of debris reflect the rockburst intensity. Both of them and the rockburst intensity decrease with the increase of the distance between the joint and the tunnel wall. (3) The farther the joint is from the tunnel wall, the lower the energy consumption of rockburst, and the more obvious the flake characteristics of debris.

Rock bursts have become a significant geohazard in the construction of underground engineering that cannot be ignored. This study conducts true triaxial five-sided loading tests on red sandstone containing different pre-existing fractures, with one side free, and utilizes a high-speed camera system and acoustic emission (AE) monitoring system to compare and analyze the mechanical characteristics of stress-strain, the development process of rock bursts, the morphological damage characteristics of the parent rock, and the evolution characteristics of AE for samples with different fractures. The results indicate that: (1) The elastic modulus, peak stress, and peak strain of rock with different fracture dip angles exhibit a trend of initially decreasing, then increasing, and finally weakening as the fracture dip angle increases. Conversely, the damage coefficient shows an opposite variation pattern; (2) The dynamic process of ejection for different fractured samples mostly goes through three stages: the rock particle ejection stage, the rock fracture stage, and the overall rock failure stage; (3) The failure mode of different parent rocks is characterized by tensile failure due to tensile action near the free surface and its surrounding area, while the failure feature away from the free surface is mainly shear failure due to shear action. Moreover, the interaction between fractures increases with the increase of fracture dip angle; (4) During the continuous loading of external stress, there will be a period of extreme value jump in absolute energy and the number of AE hits, which corresponds to the rock burst damage stage of the rock. This research provides a theoretical basis for the occurrence law of rock burst disasters in goaf areas with complex fracture network systems and is of great significance to engineering construction.