Abstract: There are many intersections due to crisscrossed preparatory workings in the non-pillar sublevel caving in Chengchao Iron Mine, which is taken as the engineering background in the study. They are the most easily deformed and destructed zone in the stope, seriously endangering the underground safety production. FLAC^3D analysis software is used to make 3D numerical simulation analysis of the intersections between link roadways that have poor stress status, in which the wall stress and strain distribution character and law are studied. It can not only make up the deficiency in the theoretical analysis and practical site measurement investigation, but also is of great practical significance in ground pressure control.

Key words: Preparatory workings, Wall rock, Stress status, Numerical simulation