###### Abstract
(2018) established simulation models of layered composite rocks using the BRM and SJM models for joint surface treatment. The SJM model more effectively reflects the anisotropic characteristics of the uniaxial compressive strength and elastic modulus of the sample and can independently calculate tensile and shear cracks. The macroscopic fracture surface of rock sample with the BRM model is more pronounced, and is also closer to the fracture surface of the physical sample than those with the SJM model. The variation characteristics of rock mechanics and fracture properties under the influence of bedding angle have been studied. [PERSON] (1999) proposed the single plane hypothesis of shear failure in anisotropic rocks, which states that the shear strength of layered rocks varies with layer orientation. Changes in the angle of bedding can lead to differences in the influence of factors, such as rock water absorption and confining pressure, on the compressive strength of rock [PERSON] (1999). Some research results show that, under uniaxial compression, the cracking stress [PERSON] et al. (2018), and peak strength of rock specimens exhibit a trend of first decreasing and then increasing with the increase in bedding dip angle [PERSON] et al. (2018); [PERSON] et al. (2018); [PERSON] et al. (2018), with a minimum occurring at a bedding dip angle of \(60^{\circ}\)[PERSON] et al. (2018); [PERSON] et al. [PERSON] et al. (2018). [PERSON] et al. [PERSON] et al. (2018) found that the tensile strength, compressive and shear wave velocities of shale all exhibit strong anisotropy. The tensile strength along the bedding plane is about 300-360 times that of the perpendicular to the bedding plane, and the compressive wave velocity perpendicular to the bedding plane is the smallest, while the shear wave velocity parallel to the bedding plane is the smallest. [PERSON] et al. [PERSON] et al. (2018) evaluated the effectiveness of lateral isotropy in the Long maxi shale formation and found that, under low confining pressure, even if both surfaces are perpendicular to the beddings, there are more fractures on the surface perpendicular to the maximum principal stress than on the surface perpendicular to the intermediate principal stress. [PERSON] et al. [PERSON] et al. (2018) performed uniaxial compression experiments at different strain rates using shale samples with various bedding orientations and found that the bedding orientation and strain rate significantly affect the failure mode of the specimens. Moreover, by adjusting the strain rate, the failure mode of the rock can be altered under different bedding conditions [PERSON] et al. (2018). [PERSON] et al. [PERSON] et al. (2018) investigated the stress-strain relationship and the mechanical properties' anisotropy of hard sandstone under the influence of bedding angle and summarized the variation of failure modes with the bedding angle. The inclination of the internal layered structure in the rock also has an impact on the microtopography of the crack surface. Under the combined action of compression and shear, the fracture morphology of the wing cracks changes from complex to simple as the angle of pre-existing fracture increases, while the fracture morphology of the anti-wing cracks and secondary cracks becomes relatively rougher, with a higher number of transgranular and intergranular cracks [29]. [PERSON] et al. [30] found that, when both defective pores and prefabricated cracks with different angles are present, the prefabricated crack angle outweighs the effect of pore location on the mechanical properties of the rock. The greater the angle, the shorter the initial crack length, and the more cracks at final failure. The perspective of bedding also affects the dynamic properties of rocks [31]. Under the action of impact load, samples with high-angle and low-angle beddings primarily fail in tension, while those with intermediate-angle beddings are more prone to shear and mixed failures.