###### Abstract
Some scholars have also studied the crack propagation behavior of layered rock mass, e.g., [PERSON] et al., (2014) analyzed the influence of the bedding direction on the expansion behavior of hydraulic cracks [12]. The fracture propagation behavior of layered rock mass has also been studied by scholars; for example, using layered phyllite, [PERSON] et al., (2015) investigated the deformation and failure of layered rock mass under dynamic splitting tensile strain and discovered that there are three different failure mechanisms, depending on the bedding angle [13]. Based on the three-point bending test and Brazilian disc splitting test, [PERSON] et al., (2015) studied the evolution mechanism of crack propagation in shale samples with well-bedding. Under the condition of three-point bending, when the bedding intersects horizontally or diagonally, the crack path will be offset along the bedding plane,  
Figure 1: (**a**) Layered red sandstone with vertical, horizontal, and inclined fractures through bedding contacts (Badami, India). (**b**) The folded layers in a valley in Namibia with potential sites for vertical, horizontal, and inclined interface cracks [11]. and the smaller the bedding angle, the stronger the crack propagation ability will be. When the bedding is vertical, the crack will propagate along the bedding plane until the failure is complete and the fracture plane is smooth and flat. The crack propagation under the Brazilian splitting condition also has a similar phenomenon to that mentioned above [14]. [PERSON] (2017) studied fracture propagation behavior in sand-mudstone interbedded rock mass based on the finite element method and found that the difference between bedding strength and principal stress has a significant influence on the fracture propagation and fracturing pressure [15]. [PERSON] et al., (2020) conducted experimental and numerical three-point bending tests on semicircular sandstone specimens with open-mode cracks to investigate the influence of bedding parameters on their mechanical fracture behavior. The experimental study focused on the effects of the loading direction and laminar dip angle on the fracture loading, fracture morphology, and damage process [16]. However, while the angle of layers, layer thickness, and layer spacing are key criteria impacting the construction, the strength qualities of the layered surface (e.g., degree of cementation) are equally important [17; 18]. As a result, the author used RFPA2D-Basic software to create a numerical model of semicircular (SCB) layered sandstone specimens, and then conducted a numerical simulation study of semicircular bending with seven different laminar dips for laminated sandstone specimens containing four different strength layers of cells (without preset fractures), combined with the stress-strain curve, peak stress, acoustic emission (AE) location map ([PERSON] et al., 2014; [PERSON] et al., 2019; [PERSON] et al., 2021; [PERSON] et al., 2021) [19; 20; 21; 22], AE energy (or the number of events), and damage cloud map of the model. The mechanical properties and damage patterns of the laminated sandstone specimens under semicircular bending loading conditions were investigated, and the failure damage mechanism was analyzed by studying the entire process of crack initiation, extension evolution, and penetration of the sandstone specimens. This provides a theoretical reference for the safety and stability of artificial storage lanes in geothermal reservoirs in China.