基于椭球体放矿理论的后和睦山铁矿脊部残留原因分析

Analysis of Causes for Ridge Hangover in Houhemushan Iron Mine Based on Ore-drawing Ellipsoidal Theory

后和睦山铁矿生产中发现,相邻进路中间的脊部矿石在下一分段难以回收,而冒险在中间增加一条进路以提高回收率的思路又增大了危险性.本文运用椭球体放矿理论,找到了导致该铁矿脊部残留矿量多的原因,并优化了进路间距.基于矿岩散体的整体流动特性,分析多漏斗放矿时的松动椭球体形态,并结合该铁矿无底柱分段崩落法开采的生产数据,最终反推得到相邻漏斗松动椭球体的空间形态关系,为优化进路间距提供依据.结果表明,该铁矿松动椭球体短半轴bs与放出体短半轴b之间的关系为bs=1.82b;bs的范围是5.90～7.96 m,即相邻漏斗松动椭球体不相互影响或相切是导致该铁矿存在脊部残留的主要原因；进路间距以8～10 m为宜.该方法为使用无底柱分段崩落法的矿山分析存在脊部残留的原因提供了一条路径.

During the production of Houhemushan iron mine, ridge hangover of two contiguous routes was difficult to recover in the lower subsection. The thought of adding another route between two primary ones venturesomely to increase recovery magnified dangerousness. Therefore, causes leading to higher quantity of ridge hangover in this iron mine were found and space between two routes was optimized by applying the ore-drawing ellipsoidal theory. Loosening ellipsoidal shapes of multi-funnel drawing were analyzed on the basis of the whole flowing characteristics of ore-rock granules. Production data of this iron mine using non-pillar sublevel caving was combined. The spatial relationship of loosening ellipsoidal shapes, based on contiguous funnels, was finally reverse calculated, providing the basis for optimizing access space. The resuhs show that the relationship between the ranges of short half axis of loosening ellipsoid and drawing ellipsoid is b~=1.82b. The range of b, is 5.90-7.96 m. In other words, the main reason resulting in ridge hangover in this iron mine is that the spatial relationship of two contiguous loosening ellipsoids, based on contiguous funnels, is separated or tangent, and 8-10 m is suitable for the access space. This method provides a new way to analyze the reason why ridge hangover exists in a mine using non-pillar sublevel caving.