高常胜,张钧鹏,邓皓泽,李宗武,陈宏灏,李冬

• 1:鞍钢集团矿业公司弓长岭有限公司井采分公司
• 2:北京科技大学资源与安全工程学院

摘要(Abstract)：

在采矿过程中，矿石通常发生拉伸破坏，为探究高、低品位铁矿石的动态拉伸力学特性，采用分离式霍普金森杆(SHPB)系统和超高速数字图像相关(DIC)技术，对品位在60%以上的富铁矿石和品位在10%到20%之间的贫铁矿石进行动态劈裂试验，分析其破坏过程、应变分布、动态拉伸强度及能量吸收特性。结果表明:高品位铁矿石裂纹扩展集中于试样中心，破坏形式以中心主裂纹贯穿为主，动态拉伸强度和加载率随冲击气压升高显著增大;低品位铁矿石因内部节理发育，裂纹沿弱面分散扩展，动态拉伸强度和加载率受节理分布影响显著，规律性较弱。能量分析表明:高品位铁矿石能量吸收率高于低品位，其破坏由矿物颗粒强度主导，而低品位铁矿石受节理面强度控制。对高品位铁矿石与低品位铁矿石各项数据对比后发现，在相同冲击气压的作用下高品位铁矿石的加载率、动态拉伸强度、最大拉伸应变和吸收能均高于低品位铁矿石。铁矿石岩性和品位对其力学性能有显著影响，实验结果可为铁矿石爆破开采参数优化及损伤控制提供理论依据。

关键词(KeyWords)： 动态拉伸力学特性;铁矿石;SHPB系统;裂纹扩展;数字图像相关(DIC)技术

Abstract:

Keywords:

基金项目(Foundation): 赋存复杂矿体无切割自由面爆破落矿技术研究(2024-科A13)~~

作者(Author): 高常胜,张钧鹏,邓皓泽,李宗武,陈宏灏,李冬

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