沿脉进路无底分段崩落法的进路参数研究

Studies on the Drift Parameters of Strike Subdrifting and Caving without Sill Pillar

分析了无底柱分段崩落法回采工作面放矿口尺寸对矿岩散体移动规律的影响,并根据椭球体放矿理论和随机介质放矿理论,得出了增大出矿口尺寸和全断面均匀放矿可改善矿石散体的移动条件进而增大矿石放出量的结论。将此结论应用到厚度中等及以下、倾角较大、下盘围岩不稳固矿体的无底柱分段崩落法开采实践中,其放矿效果明显改善,极大地提高了矿石回收率。

This paper analyzes the influences of the size of the drawing hole on the movement law of loose ore and rock in the stope byuse of subdrifting and caving without sill pillar, and according to ellipsoid ore drawing theory and random medium ore drawing theory, draws a conclusion that the movement conditions of loose ore can be improved by enlarging draw hole and implementing full face even ore drawing, so as to increase the amount of ore drawing. This conclusion had been applied to the mining practices of the orebody that its thickness was medium or under medium, incline angle is greater and floor rock is unstable by subdrifting and caving without sill pillar, resulting in the great improvement of ore drawing results and the great increase of ore recovery.