径向不耦合装药对粉矿控制的影响研究

Study on Influence of Radial Decoupling Charge on Fine Ore Control

粉矿率是矿山经济技术指标评定的重要因素之一,粉矿数量多会增大铲装、运输的难度,也会扩大矿石损失进而影响矿山开采经济效益。为了在爆破开采过程中有效降低粉矿的数量,减少矿山的损失,提高经济效益,通过ANSYS/LS-DYNA数值模拟的方法,分析模型单元失效比例和运用块度处理系统加工处理模型裂纹进一步分析块度,研究径向不耦合装药对粉矿控制的影响。研究结果得出:当炮孔直径为110 m时,随着药包直径从60 mm增大到110 mm,整体失效体积比例由27.83%增大到46.73%,岩体破碎粉矿程度逐渐增高,与此同时,大块率比例由初始的17.60%先下降至0再升高至20.01%。药包直径在80 mm时,粉矿率低,大块率符合要求。现场实证表明:优化后的装药药包直径爆破过程中,所产生粉矿有明显的降低,且块度适中。

Fine ore is one of the important factors in the evaluation of economic and technical indicators of mines.The increase of fine ore will not only complicate the difficulty of shovel loading and transportation,but also will increase the economic loss of ore which would further affect the economic benefits of a mine.In order to effectively reduce the quantity of fine ore during the blasting process,and improve the economic benefit,this paper analyzed the failure ratio of the model through ANSYS/LS-DYNA numerical simulation method.And the model crack was also studied by the block processing system to analyze fragmentation and study the effect of radial decoupling charge on the control of fine ore.The results show that when the diameter of the blast hole is 110 mm,as the diameter of the charge increases from 60 mm to 110 mm,the proportion of the total failure volume rises from 27.83%to 46.73%,and the degree of fine ore gradually increases.When the diameter of the charge is 80 mm,the fine ore ratio is low,and the large block rate meets the requirements.The field experiments showed that under the optimized charge diameter,the produced fine ore is obviously reduced,and the fragmentation is moderate.