爆破器材2024，Vol.53Issue(6)：18-23,6.DOI:10.3969/j.issn.1001-8352.2024.06.003
基于SHPB的红砂岩冲击破碎特征的试验研究
Experimental Study on Impact Fragmentation Characteristics of Red Sandstone Based on SHPB
摘要
Abstract
In order to investigate the fractal characteristics of red sandstone fragmentation under different strain rates under impact loading,a 100 mm large-diameter split Hopkinson pressure bar(SHPB)was used to conduct impact com-pression tests on red sandstone.Stress-strain curves,energy parameters,and distribution of fractured rock blocks of red sandstone under medium and high strain rates were obtained.Based on the mass fractal model of fragment size distribution,the fragmentation energy dissipation characteristics of red sandstone under impact load were analyzed,and the correlation between fractal dimension D and dissipated energy density η was quantitatively analyzed.The study results indicate that the dynamic compressive strength of red sandstone increases with the increase of strain rate,demonstrating a clear rate depen-dency.Meanwhile,the macroscopic fragmentation pattern of red sandstone becomes more crushed with the increase of strain rate.As the dissipated energy density η increases,the fractal dimension D also shows a corresponding increase,and this growth trend is consistent with the power function relationship.关键词
冲击载荷/分形维数/耗散能/破碎特征Key words
impact load/fractal dimension/dissipated energy/fragmentation characteristic分类
矿山工程引用本文复制引用
孙热,谢全民,仇志龙,万鹏,马俊,彭磊..基于SHPB的红砂岩冲击破碎特征的试验研究[J].爆破器材,2024,53(6):18-23,6.基金项目
国家自然科学基金项目(52378399) （52378399）
武汉市知识创新项目(2023020201010147) （2023020201010147）
湖北(武汉)爆炸与爆破技术研究院2022年博士科研启动基金(PBSKL-2022-QD-03) （武汉）
