无底柱分段崩落法崩落体形态新认识

New Understanding of Caved Ore Body Form by Non-pillar Sublevel Caving Method

针对无底柱分段崩落法矿石损失贫化大的特点,将落矿分为挤压和沉实两个阶段进行分析。研究落矿挤压中爆破冲击及地压综合作用对崩落矿石散体端面形态具有影响,端面矿岩边界可表示为线性或非线性关系,并分析沉实过程对崩落体塌陷区形成的重要作用,说明废石过早进入回采近路致使矿石损失贫化的原因。最后应用随机介质放矿理论分析沉实过程,推断未正式放矿前的崩落体形态。

Non-pillar sublevel caving can give rise to large ore loss and dilution rate and in view of this attribute,ore-drawing is analyzed at two stages：extrusion and settling.The study shows that comprehensive effect of blasting shock and ground pressure has some effect on surface form of caved ores and face rocks boundary can be linear or non-linear.And the important role that settling plays in the formation of subsidence area of collapsed body is also analyzed and the results show that the premature entry of waste rocks into stope short-cut leads to ores loss and dilution.In the end, the settling stage is analyzed in the stochastic medium theory of ore drawing and ores body form before caving in is inferred.