To reveal the influences of bedding angle and chemical corrosion under acidic environment on the mechanical behavior of carbonaceous slate, triaxial compression tests under chemical acidic environment corrosion were performed on bedding carbonaceous slate specimens collected from the side walls of large-deformation roadways. A continuous-discontinuous coupled numerical model based on the combined discrete element method (DEM) was developed, and numerical analysis under extended working conditions was conducted using the improved flexible membrane radial loading method, with results validated against physical test data. The results are concluded as follows. Under triaxial compression, the rock specimens develop inclined and penetrating fractures, accompanied by shear slip failure along the direction of the bedding angle. The corrosion of the chemical solution accelerates interlayer slip, leading to the gradual emergence and concentration of fractures. The peak strength of carbonaceous slate firstly decreases and then increases with the increase of bedding angle, reaching the minimum value especially when the bedding angle ranges from 15° to 45°. This phenomenon is mainly attributed to the wing crack propagation caused by shear slip and local stress concentration at this angle range. The chemical acidic environment significantly accelerates the structural deterioration of the slate. After 90 days of corrosion, the peak strength of the samples decreases by 36％ to 44％, and there is a negative correlation between the peak strength and the duration of acidic chemical corrosion. The research results provide a theoretical basis for the stability evaluation and support design of deep roadways.

Carbonaceous slate  /  Triaxial compression  /  Bedding angle  /  Chemical corrosion  /  Discrete element method