结块矿石诱导跌落冲击崩解因素的正交试验

Orthogonal experiments on impact break of induction caving to caking ore

含硫破碎矿石堆积易产生二次结块,利用诱导崩落实现结块矿石跌落冲击破碎的自然崩解是一种新的处理结块矿石的方法。在分析结块矿石跌落冲击崩解效果的影响因素的基础上,基于ANSYS-LSDYNA数值仿真试验方法,以崩解率为指标,构建结块矿石跌落破碎正交试验设计表L25(56),运用直观分析方法确定各因素的极差,绘制崩解率与因素之间的趋势图获得各因素对崩解率影响的重要性及变化规律,分析矿石诱导跌落冲击破碎的崩解效果。研究结果表明:运用正交试验方法,通过较少的试验次数,可获取诱导跌落冲击崩解的因素响应规律;在诱导跌落冲击破碎崩解中,各因素变化与崩解率之间存在一种非线性关系,跌落角度的影响最显著,其显著度(从强到弱)排序为跌落角度(B)、胶结软弱面的抗拉强度(C)、跌落高度(A)、胶结软弱面的抗压强度(D);提出在工程实践中的诱导跌落崩解的影响因素控制措施,为矿山的诱导破碎结块矿石提供了依据与技术指导。

The sulphur-containing broken ore is easy to cake. In order to process the caking ore, a new method was proposed by using the induced caving to realise natural disintegration of the caking ore. On the basis of analysing the factors of broken rate of the caking ore, the orthogonal experiments table L25（5^6） was designed and built to the impact break of induction caving. The effects of factors were simulated by ANSYS-LSDYNA numerical method according to the orthogonal experiment table, taking the broken rate as the indicator. The relationships and trends between broken rate and each factor range were determined through the direct analysis method. The influence and laws of these affecting factors of the break rate were obtained. The results show that the orthogonal experiment method is useful to study the response laws of impact factors through less test in the complicit problems; and there is a kind of non-linear relationship between the factors and broken rate. And the most significant factor is the drop angle. The order of significance of those factors form strong to weak is drop angle （B）, the cemented weak tensile strength （C）, drop height （A）, the cementing weak compressive strength （D）. The controlled measures of induction caving factors are put forward according to the results in the mining engineering.