采矿与安全工程学报2016，Vol.33Issue(2)：375-380,6.DOI:10.13545/j.cnki.jmse.2016.02.029
冲击载荷作用下煤岩破碎与耗能规律实验研究
Experimental research on failure and energy dissipation law of coal under impact load
摘要
Abstract
In order to explore the failure characteristics and energy dissipation law of coal during the impact process, the impact compression test of coal under different strain rates has been carried out by using split-Hopkinson pressure bar (SHPB) of 75 mm in diameter.The influence of loading rate on the energy dissipation and fragment distribution has also been discussed.The experiment results have shown that, the strain rate and energy of stress wave are increasing linearly with the improvement of the bullet velocity.Meanwhile, the dissipation energy which leads to the coal broken is increasing expo-nentially with strain rate.According to the research on fractal dimension of coal fragment, it has been found that the greater the strain rate is, the larger the fractal dimension is, the smaller the fragment-size is, the more severe fragmentation is. The relationship between fractal dimension and strain rate and dis-sipated energy density is of logarithmic growth, which means the increasing trend of fractal dimension is getting slower.关键词
煤岩/分离式霍普金森压杆/动态冲击/能量耗散/分维Key words
coal/split-Hopkinson pressure bar/dynamic impact/energy dissipation/fractal dimension分类
矿业与冶金引用本文复制引用
张文清,石必明,穆朝民..冲击载荷作用下煤岩破碎与耗能规律实验研究[J].采矿与安全工程学报,2016,33(2):375-380,6.基金项目
国家自然科学基金项目(51204007) （51204007）
