Abstract: Biaxial compression tests based on particle flow discrete element method were conducted on sandstone with prefabricated cracks after corrosion to analyze the crack initiation,extension and penetration damage laws of fractured rocks after different chemical corrosion,and the experimental phenomena were analyzed using particle flow PFC2D simulations to explain. The results show that:the change characteristics of the stress-strain curve of the fractured sandstone after solution corrosion under biaxial loading with different loaded side pressures with the higher side pressure loading,the higher the peak strength. The angle of wing-shaped cracks sprouting under different chemical solution corrosion changes to different degrees, and the number and angle of wing-shaped cracks and shear cracks sprouting will produce obvious changes,among which hydrochloric acid solution causes the greatest degree of damage to the rock. Considering chemical corrosion and mechanical properties together,a numerical model of the fractured rock can be established to further analyze its behavior under different environments. This is important for understanding the stability of rocks and for applications in geoengineering.

Key words: particle flow,prefabricated cracks,chemical corrosion,biaxial compression,crack propagation