Early warning of coal dynamic disaster by precursor of AE and EMR"quiet period"
Shengquan He1
Mengli Qin2
Liming Qiu3
Dazhao Song1
Xiufeng Zhang4
1.State Key Laboratory of the Ministry of Education of China for High-Efficient Mining and Safety of Metal Mines,University of Science and Technology Beijing,Beijing 100083,China;School of Civil and Resources Engineering,University of Science and Technology Beijing,Beijing 100083,China;Research Institute of Macro-Safety Science,University of Science and Technology Beijing,Beijing 100083,China2.State Key Laboratory of the Ministry of Education of China for High-Efficient Mining and Safety of Metal Mines,University of Science and Technology Beijing,Beijing 100083,China;School of Civil and Resources Engineering,University of Science and Technology Beijing,Beijing 100083,China3.State Key Laboratory of the Ministry of Education of China for High-Efficient Mining and Safety of Metal Mines,University of Science and Technology Beijing,Beijing 100083,China;School of Civil and Resources Engineering,University of Science and Technology Beijing,Beijing 100083,China;Research Institute of Macro-Safety Science,University of Science and Technology Beijing,Beijing 100083,China;Shaanxi Key Laboratory of Prevention and Control Technology for Coal Mine Water Hazard,Xi'an 710077,China;State Key Laboratory of Coking Coal Exploitation and Comprehensive Utilization,Pingdingshan 467000,China4.Shandong Energy Group Co Ltd,Jinan 250014,Shandong,China
摘要：Efficient and accurate monitoring and early warning of coal dynamic disaster and other disasters can provide guarantee for the efficient operation of mine transportation system.However,the traditional threshold early warning method often fails to warning some accidents.To address above issues,a new early warning method was proposed based on"quiet period"phenomenon of AE and EMR during fracture.It is found that,a"quiet period"of AE and EMR was present before the load reaches the peak stress,which could be used as one of the precursors to warn the imminent failure of coal and rock speci-mens.MS and AE signals increased abnormally followed by the phenomenon of"quiet period"before the occurrence of coal dynamic disaster on site,and the decrease of MS events in the"quiet period"is about 57％-88％compared with that in previous abnormal increase stage.During the damage evolution of coal and rock,"quiet period"phenomenon usually occurred at 85％-90％of the peak stress,where the slope of damage parameter curve is almost zero.The"quiet period"of the AE-EMR signals and the low change rate of damage parameter before failure provide a theoretical foundation for the coal dynamic disaster warning based on the"quiet period"precursor found in MS-AE-EMR monitoring system.These findings will help reduce the number of under-reported events and improve early warning accuracy.
机标关键词：disasterdynamicperiodcoalearlyprecursorquietwarning
论文发表日期：2022-06-28
在线出版日期：2025-08-15（本平台首次上网日期，不代表文献的发表时间）
页数：14( 106-119 )
英文信息