Abstract: To ensure the safe passage of the collapse column in the fully-mechanized top-coal caving mining face, the numerical simulation of the interrelation between the mine-induced stress and stress of collapse column was conducted. The results show that the interaction effect between the mine-induced stress and stress of collapse column can be divided into three stages: weak sub-stage, medium sub-stage and fierce sub-stage, the range of whose distance between the working face and the collapse column are 150-100 m, 100-50 m and less than 50 m respectively. Focal points differ in these three stages: in the weak sub-stage, the collapse column should be pre-reinforced, when the mine-induced stress begins to exert an effect on the stress of the collapse column; in the medium sub-stage, the stress of the collapse column starts to impact the mine-induced stress; and in the fierce sub-stage when the interrelation becomes fierce, the roof management should be strengthened. According the above research, the supporting range of roof in the K8403 working face, and the time and strength of the collapse column pre-reinforcement were identified. Meanwhile, the field practice showed that pre-reinforcement of the collapse column had a positive effect and ensured the safe passage of the collapse column.

Key words: fully-mechanized working face, collapse column, mine-induced stress, numerical simulation