浅孔留矿法与同步充填留矿法放矿过程力链演化特征比较

相较于浅孔留矿法，由于同步充填留矿法在大量放矿前预先铺设柔性隔离层，造成放矿规律出现重大改变。基于两种采矿方法的共性，借助离散单元软件，开展了浅孔留矿法与同步充填留矿法放矿过程矿 石散体力链演化特征的对比研究。结果表明：两种采矿方法放矿过程中，强接触占比与力链接触占比随着放矿次数增加，呈现出的变化规律也不尽相同；力链数量随着放矿次数增加也呈现出不同的变化规律，但力链 长度的概率分布规律却高度一致，均呈指数形式减少；相较于浅孔留矿法，虽然同步充填留矿法放矿过程中矿石散体内部力链强度波动幅度较小，但在不同放矿节点条件下矿石散体内部力链强度的概率分布均先呈指 数形式上升再呈指数形式下降，呈现出相同的变化规律；放矿过程中，矿石散体内部力链方向分布均呈现出明显的阶段性变化，且各阶段内力链方向变化规律、力链方向分布各向异性程度表征参数变化规律各不相同 。研究成果对同步充填留矿法放矿过程矿石流动规律的研究具有一定的借鉴意义。

Comparison of Force Chain Evolution Characteristics During Ore Drawing Process Between Short-hole Shrinkage Method and Synchronous Filling Shrinkage Method

Compared with short-hole shrinkage method， synchronous filling shrinkage method has a significant effect on ore drawing law owing to flexible isolation layer laid before a large number of ore drawing. Based on common features of two mining methods， with the help of the discrete element software， the comparative study on the evolution characteristics of the force chain in the ore drawing process between the short-hole shrinkage method and the synchronous filling shrinkage method is carried out. The results show that in the drawing process of the two mining methods， both the proportion of strong contact and force chain contact increase with the drawing times， the law of change is also different. The number of force chains varies with the increase of drawing times， but the probability distribution law of force chain length is highly consistent， which decreases exponentially. Compared with the short-hole shrinkage method， although the fluctuation range of the force chain strength in the system is small during the drawing process of synchronous filling shrinkage method， but the probability distribution of the force chain strength of the two methods first increases in exponential form and then decreases in exponential form under different drawing nodes， showing the same variation law. In the process of ore drawing， the direction distribution of force chain in the granular materials systems shows obvious change in different stages， the variation law of force chain direction and anisotropy degree characterization parameter have significant difference in each stage. The research results have certain significance for the further study on the ore flow law in the drawing process of synchronous filling shrinkage method.