Mining sequence research of backfill mining in double middle sections of Jinchuan No.2 mining area
ZHAO Yang1， LI Xiangdong2， ZHU Yuanle2， WANG Tao1
(1.State Key Laboratory of Water Resources and Hydropower Engineering Science， Wuhan University， Wuhan 430072， China；2.Changsha Institute of Mining Research Company， Changsha 410012， China)
Abstract：Mining of the double middle sections in Jinchuan No.2 Mining area belongs to mining under high in-situ stress and faces many risks such as instability of horizontal pillars and large volume backfill. In order to ensure the production safety of Jinchuan Mining area， aiming at the mining stability of double middle sections of Jinchuan No.2 mining area， the concurrent mining of 1 000 m and 850 m sections of Jinchuan No.2 mining area as the research object is taken， and the three-dimensional model of ore-body is established. The mining sequence was optimized by numerical simulation method， and three schemes were set up， respectively： mining from left to right， from both sides to the middle and from middle to both sides in turn. The stress and settlement changes of horizontal pillar， backfill and surrounding rock under different mining schemes are analyzed and compared. The research results show that the mining from left to right is more conducive to the stability of the mining， and the more dangerous areas appear in the long span area of the 1 000 m horizontal pillar and the edge of the backfilling body.
2022, Vol. 56 
