摘要
为分析浸水作用下磁铁矿的动态损伤特性以及能量运移规律,对磁铁矿进行不同时间的浸水处理,利用霍普金森压杆试验系统(SHPB)对浸水磁铁矿开展了不同冲击载荷值的动态压缩试验。结果表明:浸水作用下磁铁矿动态破坏变形过程分为弹性变形,屈服损伤变形以及失稳破坏3个阶段;磁铁矿动态抗压强度随浸水时间增加而减小,两者呈指数递减关系,而磁铁矿的动态抗压强度减少值先增大后减小,当浸水时间为14 d时,动态抗压强度减小值最大;随浸水时间增加,磁铁矿破碎程度增大,但浸水时间为14 d的整体破碎均匀度最佳;浸水磁铁矿能量演化过程分为弹性储能,能量转换,能量耗散3个阶段;增加动态载荷值可提高浸水时间14 d的磁铁矿能量利用率,在此浸水时间下磁铁矿能耗密度最大,表明开展磁铁矿浸水处理可以有效改善矿石破碎的不均匀度,减少二次破碎工作量,一定程度上降低爆破能耗。研究结果为富水矿体安全高效开采提供一定理论指导。
In order to analyze the dynamic damage characteristics and energy transport law of magnetite under water im-mersion effect,the magnetite was immersed in water for different times,and the dynamic compression tests with different impact load values were carried out by using the Hopkinson pressure bar test system(SHPB).The results show that the dynamic fail-ure deformation process of magnetite under water immersion is divided into three stages:elastic deformation,yield damage de-formation and instability failure.The dynamic compressive strength of magnetite decreases with the increase of immersion time,and the relationship between them is exponentially decreasing.The decreasing value of the dynamic compressive strength of magnetite first increases and then decreases,and the decreasing value of the dynamic compressive strength is the largest when the immersion time is 14 d.With the increase of immersion time,the fragmentation degree of magnetite increases,but the over-all fragmentation uniformity is the best when the immersion time is 14 d.The energy evolution process of immersed magnetite is divided into three stages:elastic storage stage,energy conversion stage and energy dissipation stage.Increasing the dynamic load value can improve the energy utilization rate of magnetite with immersion time of 14 d,and the energy consumption density of magnetite is the largest under this water immersion time,which indicates that the magnetite with water immersion treatment can effectively improve the uneven degree of ore fragmentation,reduce the workload of secondary fragmentation,and decrease the blasting energy consumption to a certain extent.The research results provide certain theoretical guidance for the safe and ef-ficient mining of water-rich orebodies.
作者
路燕泽
甘德清
王社光
刘志义
王庆刚
王立杰
LU Yanze;GAN Deqing;WANG Sheguang;LIU Zhiyi;WANG Qinggang;WANG Lijie(Shahe Zhongguan Iron Mine Co.,Ltd.,Hebei Iron and Steel Group,Xingtai 054100,China;Hebei Complex Iron Ore Low Carbon Intelligent and Efficient Mining Technology Innovation Center,Xingtai 054100,China;School of Mining Engineering,North China University of Science and Technology,Tangshan 063210,China;Collaborative Innovation Center of Green Development and Ecological Restoration of Mineral Resources,North China University of Science and Technology,Tangshan 063210,China;Hebei Mining Development and Safety Technolegy Laboratory,Tangshan 063210,China)
出处
《金属矿山》
CAS
北大核心
2024年第4期95-101,共7页
Metal Mine
基金
河北省重点研发计划项目(编号:20374103D)。
关键词
浸水作用
磁铁矿
动态损伤
能量演化
water immersion effect
magnetite ore
dynamic damage
energy evolution
