陕西徐家沟铜矿破碎矿体出矿巷道间距研究

出矿巷道间距问题不同于一般的平行巷道间距问题,目的是在矿石回收率和出矿巷道稳定性间取得平衡。以陕西徐家沟铜矿破碎矿体为工程背景,联合利用放矿实验和FLAC3D数值模拟确定出矿巷道间距。根据椭球体放矿理论进行放矿实验并获得放出体形态参数;在此基础上通过数学回归得到放出体偏心率方程,放矿高度50 m时,放出体b轴长6.53 m,按照放出体高分段排列确定出矿巷道的理论间距为15.1 m。考虑到矿体破碎、采场顶板不稳,按照"本中段矿石尽量在本中段回收"的原则,选择10 m和12.5 m 2种间距进行FLAC3D数值模拟。结果表明:采用12.5 m的间距时,既能最大限度保证出矿巷道的稳定,又能提高矿石回收率。

Study on Spacing of Ore Drawing Roadway in Broken Orebody of Xujiagou Copper Mine in Shaanxi Province

The spacing of ore drawing roadway is different from that of the general parallel roadways.In order to keep a balance between the recovery rate of ore and the stability of ore drawing roadway，and with Xujiagou copper mine in Shaanxi Province as engineering background，the roadway spacing is determined by ore drawing experiment and FLAC3D numerical simulation.According to the ellipsoid drawing theory，the ore drawing experiment is carried out and the parameters of the ore-drawing body are obtained.On this basis，the eccentricity equation of ore-drawing body is obtained by mathematical regression.When the drawing height is 50 m，and the b-axis length is 6.53 m，the theoretical spacing is determined 15.1 m according to ore-drawing body arrangement of high sublevel.Considering the situation that the orebody is broken and the stope roof is instable，and in accordance with the principle of “recovering ore as much as possible in the same middle section”，two spacing intervals of 10 m and 12.5 m are selected to make FLAC3D numerical simulation，and the results show that the 12.5 m spacing can maximize the stability of ore drawing roadway，and improve the recovery rate of ore.