落锤冲击破碎下矿石碎屑分布特征实验研究
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摘要
为了研究矿石冲击破碎后的块度分布情况,利用落锤冲击实验装置,对磁铁矿石试件进行不同冲击高度的破碎实验。通过定义碎屑形态特征、引入分形理论,系统地研究了碎屑的尺寸特征、分形维数等变化规律。研究表明,随着输入能的提高,相同宽厚比的碎屑累积数量与累积质量减少,长宽比则反之;相同长厚比的碎屑数量逐渐降低;长板状碎屑逐渐减少,片状碎屑逐渐增加,碎屑以长板状、柱状与板状居多;由"质量-频率法"与"特征尺度法"所求得的分形维数均逐渐增大。经比较得出,在"特征尺度法"中以碎屑的最大宽度作为特征尺度计算分维值最准确。
In order to study the distribution of ore fragment after impact crush,the crush experiments of magnetite specimens with different impact heights were carried out by using the drop hammer impact test device.The variation law of the size characteristics and fractal dimension of fragments were studied systematically by defining the fragment morphological characteristics and introducing fractal theory.The results showed that with the increase of input energy,the cumulative quantity and the cumulative mass of fragment decreased with the same ratio of width to thickness,on the contrary,it increased with the ratio of length to width.The amount of fragment with the same ratio of length to thickness decreased gradually.The lath shape fragment decreased gradually,the flake shape fragment increased gradually,and most of the fragment types were lath,cylinder and tabular shape.The fractal dimension obtained by mass-frequency method and characteristic scale method increased gradually.It was found that taking the maximum width of fragment as the characteristic scale was the most accurate method for calculating the fractal dimension in the characteristic scale method by comparison.
In order to study the distribution of ore fragment after impact crush,the crush experiments of magnetite specimens with different impact heights were carried out by using the drop hammer impact test device.The variation law of the size characteristics and fractal dimension of fragments were studied systematically by defining the fragment morphological characteristics and introducing fractal theory.The results showed that with the increase of input energy,the cumulative quantity and the cumulative mass of fragment decreased with the same ratio of width to thickness,on the contrary,it increased with the ratio of length to width.The amount of fragment with the same ratio of length to thickness decreased gradually.The lath shape fragment decreased gradually,the flake shape fragment increased gradually,and most of the fragment types were lath,cylinder and tabular shape.The fractal dimension obtained by mass-frequency method and characteristic scale method increased gradually.It was found that taking the maximum width of fragment as the characteristic scale was the most accurate method for calculating the fractal dimension in the characteristic scale method by comparison.
引文
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[2]何满潮,杨国兴,苗金丽,等.岩爆实验碎屑分类及其研究方法[J].岩石力学与工程学报,2009,28(8):1521-1529.
[3]申其鸿.国内某排土场岩石块度分布规律研究[J].矿业研究与开发,2016,36(7):63-67.
[4]张艳博,刘志超,田宝柱,等.巷道围岩红外温度场特征粗糙度演化过程研究[J].矿业研究与开发,2017,37(12):93-98.
[5]饶运章,姜福川,陈金龙,等.离子型稀土矿柱浸实验抗剪强度的分形特性研究[J].矿业研究与开发,2018,38(4):35-39.
[6]殷志强,李夕兵,马海峰,等.围压卸荷条件砂岩动静组合加载碎块分维特性[J].振动与冲击,2014,33(9):83-88.
[7]杨阳,杨仁树,王建国,等.低温条件下红砂岩动态力学性能试验研究[J].煤炭学报,2018,43(4):967-975.
[8]林大泽.爆堆块度评价方法研究的进展[J].中国安全科学学报,2003(9):12-16.
[9]题正义,衣东丰.爆堆矿岩块度分布测试方法概述[J].辽宁工程技术大学学报,2003(S1):1-3.
[10]单晓云,李占金.分形理论和岩石破碎的分形研究[J].河北理工学院学报,2003(2):11-17+30.