煤系岩石脆性破坏临界电磁辐射信息分析

Analysis on the Critical Electromagnetic Emission During Coal or Rock Fracture

根据煤系岩石加载破坏过程中的电磁辐射信息与其受载变形破坏过程的相关关系,分析了煤系岩石脆性破裂前的电磁辐射信号突增现象.通过试验数据和用岩石破坏重整化群理论系统研究岩石破裂前临界点的电磁辐射信息识别条件.单轴荷载条件下,临界点对应的应力和岩石峰值应力比值在其临界比大都在70%与80%之间,均值75%左右,误差在±9%以内,表明岩石内部微裂纹的形成与原有裂纹的扩展是电磁辐射活动的主要原因.上述研究可为煤岩动力灾害防治提供有力的依据.

It was analyzed the sudden increase of electromagnetic counts and emission before the rock brittle failure, and obtained the relationship between electromagnetic emission and rock compression process under loading , which was based on renormalization group theory. Combining rock uniaxial compression results, it was shown that the stress ratio between the electromagnetic emission of critical state and peaking state had a value range 70% to 80%. According to the test data, it could get that the stress ratio between critical point, had a value of nearly to 75% ,and the deviation was less than ＋ 9%, which was reveal that the micro-crack expansion was the main causes of electromagnetic radiation. This research resuh provides the prevention basis for the coal or rock dynamic disaster.