###### Abstract  
Intact rock-like specimens and specimens that include a single planar joint or triangular sawteeth joint at various angles are prepared for split Hopkinson pressure bar (SHPB) testing at loading rates of 303.1-5233.6 GPa/s. Only results that are associated with an error (\(e_{\varepsilon}\)) of less than 20.0% are utilized in subsequent analyses. The effects of the loading rate and angle of the load applied to various joint patterns on the failure type and dynamic peak stresses/strength of the specimens are investigated. Experimental results demonstrate that failure of each specimen can be classified into the following four types, Type A: integrated with or without tiny flake-off, Type B: slide failure, Type C: fracture failure, and Type D: crushing failure. The results of statistical analysis of variance (ANOVA) indicate that the loading rate, the angles of the base plane (\(\beta\)), and the asperity (\(\alpha\)) of the sawteeth joint of the specimen all affect its dynamic peak stress when fracture failure occurs. The loading rate and \(\beta\) are important when the slide failure occurs, and the loading rate is the sole factor that significantly influences its dynamic peak stress when the specimen is crushed to failure. The dynamic peak stress of the specimen increases with the loading rate, while the rate of increase gradually decreases. The \(\beta\) and \(\alpha\) of a jointed specimen affect the location of stress concentration during loading, further influencing the dynamic peak stress of such a specimen under slide and fracture failure. When the loading rate is high and the specimen is crushed to failure, the influences of \(\beta\) and \(\alpha\) disappear, and the increase of loading rate reduces the efficiency of raising the dynamic peak stress. regular rock joints; failure type; dynamic peak stress; loading rate; angle of load +
Footnote †: journal: Applied  
Rock engineering conventionally considers the strength and deformation of rocks in a static state. Discontinuities in rock are typically weak, resulting in reduced engineering performance, such as reduced strength, increased deformation and permeability, and anisotropy of mechanical and hydraulic properties. A large number of studies have explored the effects of discontinuities on rock engineering using field measurements [11; 12; 13], laboratory tests [14; 15; 16], and numerical simulations [17; 18; 19]. Although several studies of the static influences of discontinuities on rock engineering have been conducted, most current research in the field of rock dynamics concentrate on intact rock, including the influence of loading rate on strength, crack initiation, and propagation [20]. Improvements in measurement equipment and technology have led to a wide range of investigations of the dynamic characteristics of intact rock specimens at different loading rates using power test instruments, such as MTS-810 and Split Hopkinson Pressure Bar (SHPB) [21; 22], but experimental studies and simulations of rock discontinuities are few. [PERSON] et al. [23] theoretically and experimentally investigated the influence of the frequency on the amplitude of an elastic wave when the wave is transmitted through a single joint. [PERSON] and [PERSON] [24] proposed a theoretical solution for the transmission of a P-wave through a joint with non-linear deformation behavior. In recent years, many studies have used a SHPB to investigate the effects of the joint contact area ratio, width, matching coefficient, and filling condition on wave transmission and energy absorption/loss when an incident wave propagates across the joint [25; 26]. Experimental results of [PERSON] et al. [27] indicated that the distribution of absorbed energy that corresponds to a joint angle within range [0, 90\({}^{\circ}\)] is quite similar in shape to a letter \"U\" and that singly jointed rock has dynamically anisotropic characteristics. Additionally, when the incident energy remains constant, less energy is absorbed in a shorter incident time.