煤岩循环加载破坏电磁辐射能与耗散能的关系

Correlation between electromagnetic radiation and dissipated energy of coal rock duringcyclic loading

研究了煤岩体损伤破坏过程中的能量转化机制,以煤岩体加卸载循环过程中产生的滞回环为桥梁建立了受载煤岩体电磁辐射能与耗散能之间的关系,并利用龙煤集团新陆及峻德煤矿煤样进行了实验室实验验证.结果表明:煤样电磁辐射能累计与对应的耗散能累计(滞回环面积累计)很好的服从y=aln x+b形式的关系,正相关系数多在0.90以上,不同频率天线接收的电磁辐射信号不会对此关系产生实质影响;由于煤岩体内部结构的强离散性,相同矿区相邻取样点的煤样在整个破坏过程中产生的电磁辐射累计能量存在一定的差异,对应的耗散能也有所不同,但总体上两者呈正相关关系.

Electromagnetic radiation （EMR） and dissipated energy were measured during the stress loading of coal rock. The mechanism of energy conversion during damage to the rock was studied. A relationship between EMR and dissipated energy was established that involved the hysteresis loop seen between loading and unloading of the material. Laboratory experiments on Xinlu and Junde coal samples were.performed. The cumulative EMR energy is related to the ar- ea of the hysteresis loop, which corresponds to the dissipated energy, by an equation of the form ：y = aln sc＋b. The correlation coefficient for the fit of the data to this equation was grea- ter than 0.90. Using EMR signals of different frequencies have little effect On the relationship. Adjacent samples from a mine show different total EMR release and dissipated energy. Never- the-less, these are positively correlated overall.