Abstract: The isolated pillar in underground mine is broken down frequently, and the existing stope is often disturbed by large amount of waste rock. According to the existing problems in underground mine, the processing method is proposed by constructing artificial pillar in loose body by grouting technique. Based on the actual situation of 1010 stope in Songshujiao Mine, the dimension of artificial pillar is calculated based on the gravity retaining wall theory, the structural parameters of artificial pillar is simulated and verified by adopting finite element software, the results show that, the stability of artificial pillar can be guaranteed with the dimension of 30 m×28 m×14 m, and the grouting scheme is designed. The industrial experimental results indicated that the artificial pillar in loose body is constructed successfully, the disturbance of waste rock is eliminated effectively from the adjacent gob, and the stope stability is guaranteed, about 15 693 t resources from the pillars are obtained, therefore, the economic benefits is good.

Key words: Grouting, Artificial pillar, Loose body, Stability