摘要
煤体应力状态的准确测试是工程实践中的一项重要工作,受载煤体变形及破裂时能够产生电磁辐射,煤体中应力越高,变形破裂过程越强烈,电磁辐射信号越强,可以利用煤体变形及破裂时产生的电磁辐射信号间接确定煤体应力状态的变化特征.用电磁辐射法测试了煤体应力状态,并进行了工程实践验证.结果表明:电磁辐射信号的变化与煤体的应力状态的分布有较好的对应关系.电磁辐射技术可以确定煤体支承压力的分布,是测试煤体应力状态的一种新方法.
Accurate monitoring of stressed state of coal is an important work in the engineering practice. The loaded coal body may produce electromagnetic emission （EME） in the process of deforming and fracturing, and the greater the stress is, the more intensive the deformation and fracturing are, and the more intensive the electromagnetic emission will be. The change characteristics of the stressed state can be indirectly estimated by means of EME when the loaded coal deforms and fractures. The coal stressed state was tested by monitoring EME, and was validated by engineering practice . The results show that there is a good relation between the EME and the coal stressed state. So the EME monitoring technology is proved to be a good method for monitoring stressed state of coal.
出处
《采矿与安全工程学报》
EI
北大核心
2006年第1期111-114,共4页
Journal of Mining & Safety Engineering
基金
国家自然科学基金项目(50204010
50404015)
国家自然科学基金仪器专项(50427401)
关键词
应力状态
电磁辐射
曼承压力
卸压区
集中应力区
原岩应力区
stressed state
electromagnetic emission
abutment pressure
stress-relaxed area
stress-concentrated area
initial stress area
