煤体冲击破坏过程中的近磁场突变效应及其机理研究

Transient effect and mechanism of near magnetic field in impact failure process of coal mass

利用SHPB实验系统进行煤体冲击破坏试验,同时运用ZDKT-1型瞬变磁振测试系统测试了煤体近距离瞬变磁场变化并分析了其产生机理。试验表明,煤体在受到高速冲击破坏时其近距离磁场会发生瞬间突变。采用红外光谱技术对冲击破坏煤体进行对比分析,研究表明受冲击破坏前后煤体中的羟基氢键的状态发生了变化,认为大量的氢键断裂发生电荷的分离和转移是煤体近距离磁场瞬间突变的重要原因。

In this paper, the impact failure experiment of coal mass was conducted in SHPB experi-mental system. Meanwhile, the changes of near transient magnetic field were tested by ZDKT-1 Tran-sient Magnetic Testing System, and the generation mechanism was analyzed. The results show that the near magnetic field of coal mass will be mutated suddenly when the coal samples were suffered by high speed impact. In addition, different impact damage characteristics of coal mass were comparatively analyzed through infrared spectrum technique. It is concluded that H-bonds of hydroxyl group are changed at different statuses before and after the impact failure process of coal samples, and the separa-tion and transfer of massive electric charge during the H-bonds rupture is one of the most important reasons for instant mutation of near magnetic field.