摘要
随工作面的推进,顶板要产生裂缝、裂缝贯通、破断,然后来压。而顶板破裂时,将会产生电磁辐射现象,煤体中应力越高,顶板运动越剧烈,损伤破裂过程越强烈,电磁辐射信号就越强。研究表明,电磁辐射信号的变化与工作面顶板断裂时间及地点有较好的对应关系,电磁辐射技术可推断工作面顶板运动状态的发展,是监测预报采面顶板运动的一种新的方法。
With the advancing of work face, the cracks will be induced and then impenetrate with each other in roof, and result in the rupture of roof and roof weighting. During the process of breach in roof, the phenomenon of electromagnetic emission would be induced. The higher the stress in coal mass is, the fiercer the movement of roof is, the more intense the process of breach is, the greater the electromagnetic signal is. Research shows that there are some evident corresponding relationships between the changes of electromagnetic signals and the time and place when and where the roof above work face ruptures. The development of the motion state of the roof above work face can be concluded with electromagnetic technology, which is a new method of monitoring and forecasting the movement of the roof above work face.
出处
《矿山压力与顶板管理》
北大核心
2005年第3期40-42,共3页
Ground Pressure and Strata Control
基金
国家自然科学基金资助项目(50490273
50474068
50074030)
教育部博士点基金资助项目(20030290017)
