ACOUSTIC EMISSION AND INFRARED CHARACTERISTICS OF COAL BURST PROCESS
Strain coalburst tests of coal samples were carried out by the experimental system of rockburst to study the coal disaster mechanism at a high stress state. The acoustic emission (AE) signals and the infrared thermography for the coal samples were detected and obtained during the tests. We mainly investigated the coalburst mechanism of the coal samples by AE technique and infrared thermography from unloading to failure. The basic parameters such as the energy rate and AE events were used to transform the data between time and frequency. AE events significantly increased during unloading. There were obvious high-temperature zones before coal burst. It is concluded from the characteristics of AE and infrared thermography of coalburst process that there are the stress concentration phenomena within the coal samples and the local high-temperature zone appeared from the infrared thermography. It is indicated by the intensive AE activity that as the partial release of stress before coalburst, macro-cracks were formed and extended. Thus a large amount of energy was released, inducing coalburst.
DE-JIAN LI XUE-NA JIA JI-LI FENG WEI-LI GONG XIAO-MING SUN JIN-LI MIAO
School of Mechanics and Civil Engineering, China University of Mining and Technology in Beijing, 100083, P.R.China
国际会议
The 7th International Symposium on Rockburst and Seismicity in Mines(2009年第七届国际岩爆与微振动性学术研讨会)
大连
英文
1341-1346
2009-08-21（万方平台首次上网日期，不代表论文的发表时间）