煤矿安全2019，Vol.50Issue(7)：46-49,4.DOI:10.13347/j.cnki.mkaq.2019.07.011
冲击载荷下煤体动力学性能及电磁信号变化特征研究
Study on Dynamic Characteristics and Electromagnetic Signal Variation Characteristics of Coal Under Impact Loading
摘要
Abstract
In order to reveal the dynamic properties and electromagnetic signal variation characteristics of outburst coal seam, the dynamic mechanical properties of coal samples under impact loading were studied by using SHPB bar technology with a cross section of 50 mm. The results show that with the increase of strain rate, the dynamic response of coal materials transits from hardening to softening, and the coal samples are destroyed. The electromagnetic signal released during the process lasts less than 1 second and its frequency ranges from 0 Hz to 40 Hz. The electromagnetic signal shows the characteristics of straight-line rise, exponential decline and small oscillation at the end, and increases with the increase of impact velocity, average strain rate and maximum strain rate, while decreases with the increase of failure strain.关键词
突出煤层/冲击载荷/电磁信号/动态力学性能/SHPB杆技术Key words
outburst coal seam/impact load/electromagnetic signal/dynamic mechanical properties/SHPB rod technology分类
矿业与冶金引用本文复制引用
张宇旭,王科..冲击载荷下煤体动力学性能及电磁信号变化特征研究[J].煤矿安全,2019,50(7):46-49,4.基金项目
湖北省教育厅科研计划资助项目(B2016275) （B2016275）
湖北理工学院科研资助项目(14xjz02A) （14xjz02A）
