某铁矿矿岩中含水量对放出体形态影响的试验研究

合理的采场结构参数和放矿管理可以取得较好的矿石贫损指标，矿岩放出体形态对采场结构参数优化调整及放矿管理尤为重要。为研究某铁矿矿岩中含水量与放出体形态的关系，在不同含水量条件下（含水量ω分别为0、4%和6%），对取自该铁矿井下采场的矿岩材料进行了单体放矿物理相似模拟试验。结果表明：①沿进路方向，矿岩中含水量对放出体形态的影响较小，但随着含水量的增加，顶部矿石在放出矿石量中占比越来越大；②在垂直进路方向，当矿岩中不含水时，放出体形态接近椭圆，矿石放出效果好；ω=4%时，放出体下部偏“瘦”，表明侧面矿石放出困难；ω=6%时，放矿过程中多次出现矿石成拱堵塞现象，导致放出体形态异常；③降低矿岩散体中的含水量有利于无底柱分段崩落法爆堆中矿岩散体连续、顺利放出。

Experimental Study on the Effect of Water Content in Ore-rock on the Shape of Drawn-out Orebody in an Iron Ore

Reasonable stope structure parameters and oredraw management can acquire better index of ore loss and dilution indicators，and the shape of drawn-out ore and rock is particularly important for optimizing stope structure parameters and oredraw management.In order to study the relationship between water content (water content ω is 0，4% and 6%) in the shape of draun-out orebody in an iron mine in Xinjiang，physical similarity simulation experiment of single ore drawing is carried out with ore-rock materials taken from underground stope of the mine.The experimental results show that:①the water content in ore-rock has little influence on the shape of drawn-out orebody along the drift，but with the increase of water content，the proportion of top ore on the amount of ore drawing is increasing；②in the vertical direction of drift，when there is no water in ore-rock，the shape of drawn-out orebody is close to an ellipse，which indicates that the effect of ore drawing is good；when ω is 4%，compared with other conditions，the underpart of the drawn-out orebody is narrow，which indicates that it is difficult to draw side ore at this time；when ω is 6%，arch blockage of ore occurs many times in the process of ore drawing，which leads to abnormal shape of drawn-out orebody；③reducing the water content in ore-rock bulk is beneficial to the continuous and smooth drawing of ore-rock granular of muckpile in non-pillar sublevel caving.