Study on signal characteristics of burst tendency coal under different loading rates  

作　　者：Chao Zhou Xueqiu He Dazhao Song Zhenlei Li Huakang Yang Yang Liu Lei Guo 

机构地区：[1]School of Civil and Resources Engineering,University of Science and Technology Beijing,Beijing 100083,China [2]Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mine,University of Science and Technology Beijing,Beijing 100083,China

出　　处：《International Journal of Coal Science & Technology》2024年第5期142-150,共9页国际煤炭科学技术学报(英文)

基　　金：Supported by the National Natural Science Foundation of China(52304203,52374180 and 52327804).

摘　　要：In order to study the mechanics,acoustic emission(AE)and electromagnetic emission(EME)response law of bursting liability coal at different loading rates,uniaxial compression tests were carried out on coal mass from Konggu Coal Mine.The corresponding relations among mechanical properties,AE and EME signals in the process of coal failure under loading were analyzed,and the energy evolution law of coal failure with bursting liability under loading rate was discussed.The results show that within a certain range of loading rate,the higher the loading rate,the higher the compressive strength and peak load of bursting liability coal,and the shorter the time for coal to reach the peak load.Under different loading rates,the mechanics,AE and EME signals of coal samples can be well corresponded.When the loading rate is low,the number of blocks destroyed of coal sample is large and the block size is relatively small,and the blocks are mainly scattered around the test platform.When the loading rate is high,the number of damaged blocks is relatively small and the block size is relatively large,and the blocks are far away from the test bench.When loading at a low rate,the internal cracks in coal can be fully developed and connected,and the energy release rate is relatively uniform in the process of loading and failure of coal sample.In the case of high loading rate,the energy release rate of coal sample in the loading process is much smaller than that in the moment of failure.Combining the above test results with the actual situation of the working face,it can be concluded that the total energy stored in the coal of fast mining increases and the threshold of impact decreases compared with that of slow mining.Therefore,under the disturbance of external dynamic load,rapid mining is more likely to induce rock burst.

关 键 词：Loading rate Burst tendency The mechanics AE and EME response Block damage Energy release rate Mining speed Rock burst 

分 类 号：TD324[矿业工程—矿井建设] TP274[自动化与计算机技术—检测技术与自动化装置]