冲击荷载下石墨矿石破碎能耗特征  

Crushing Energy Dissipation Characteristics of Graphite Ore Rock under Impact Loads

作　　者：叶海旺[1,2] 严立德 雷涛[1,2] 王其洲[1,2] 余梦豪[1] 李兴旺 温颖 高玉文 周建敏 DAHE M G YE Hai-wang;YAN Li-de;LEI Tao;WANG Qi-zhou;YU Meng-hao;LI Xing-wang;WEN Ying;GAO Yu-wen;ZHOU Jian-min;DAHE M G(School of Resources and Environment Engineering,Wuhan University of Technology,Wuhan 430070,China;Hubei Key Laboratory of Mineral Resources Processing and Environment,Wuhan University of Technology,Wuhan 430070,China;Minmetals Exploration and Development Co.,Ltd.,Beijing 100044,China;Poly Xinlian Blasting Engineering Limited Company,Guiyang 550002,China)

机构地区：[1]武汉理工大学资源与环境工程学院,武汉430070 [2]武汉理工大学矿物资源加工与环境湖北省重点实验室,武汉430070 [3]五矿勘查开发有限公司,北京100044 [4]保利新联爆破工程集团有限公司,贵阳550002

出　　处：《爆破》2023年第1期30-36,共7页Blasting

基　　金：国家重点研发计划(2020YFC1909602);国家重点研发计划(编号:2021YFC2902901);湖北省重点研发计划(2021BCA152);中央高校基本科研业务费专项(2021-ZH-B1-05)。

摘　　要：为了研究晶质石墨矿石试样在冲击荷载作用下的破碎能耗特征,采用∅50 mm的分离式霍普金森压杆(SHPB)试验装置,设置气压间隔为0.1 MPa,0.2~0.6 MPa共5组冲击气压,进行不同加载速率条件下石墨矿石试样冲击压缩试验,并分析石墨矿石试样破碎能耗规律。试验结果表明:在冲击荷载作用下,石墨矿石试样的动态抗压强度与平均应变率具有较强的三阶多项式关系,且石墨矿石在冲击荷载作用下具有动态硬化作用,其动态抗压强度随着应变率的增大呈非线性增大,呈现明显的应变率效应;石墨矿石试样破碎耗能与入射能具有显著的对数关系,随着入射能增大,试样破碎耗能也随之增大,但其试样破碎耗能所占比例随应变率增大逐渐由0.38下降至0.11;随着平均应变率增大,石墨矿石试样破碎耗能密度呈非线性增长,具有较强的应变率效应;石墨矿石试样的破碎平均粒径与破碎耗能密度具有显著的三阶多项式相关关系,随着石墨矿石试样耗能密度增加,石墨矿石试样破碎程度加剧,可以采用石墨矿石试样破碎块度平均粒径实现对石墨矿石试样破碎程度进行定量描述。In order to study the crushing energy dissipation characteristics of graphite ore rock under impact loads,∅50 mm diameter split Hopkinson pressure bar(SHPB)test device is used to conduct impact compression tests.The crushing energy dissipation law of the graphite ore rock samples is analyzed under different loading rates with five different impact pressures from 0.2 MPa to 0.6 MPa with a 0.1 MPa interval.The test results show that the dynamic compressive strength of the samples have a strong third-order polynomial relationship with the average strain rate under impact loads.The graphite ore rock has dynamic hardening under impact loads,and its dynamic compressive strength increases nonlinearly with the increase of strain rate,which shows an obvious strain rate effect.In addition,there is an obvious logarithmic relationship between the crushing dissipation energy and the incident energy.With the increase of incident energy,the crushing dissipation energy also increases.However,the proportion of the crushing energy gradually decreases from 0.38 to 0.11.The crushing energy dissipation density of the samples has an obvious strain rate effect,and its value increases with the increase of strain rate.Besides,the average particle size of the broken samples is strongly correlated with the energy dissipation density of the samples.As the energy dissipation density increases,the crushing degree of the sample becomes more severe.Therefore,the average particle size of the crushing fragments can be used to quantitatively describe the crushing degree of the samples.

关 键 词：冲击荷载 破碎块度 破碎耗能 分离式霍普金森压杆(SHPB) 

分 类 号：TD235.3[矿业工程—矿井建设]