doi:10.16186/j.cnki.1673-9787.2019120077

Received:2019/12/23

Revised:2020/01/03

Published:2021/09/15

Study on acoustic emission characteristics in the process of fracture of coal-rock combination body with different thickness of coal

LI Huigui1, LI Huamin2, GAO Baobin3

1.College of Mining Engineering， Guizhou University of Engineering Science ，Bijie  551700， Guizhou， China;2.School of Energy Science and Engineering ，Henan Polytechnic University， Jiaozuo  454000 ， Henan， China;3.College of Safety Science and Engineering， Henan Polytechnic University， Jiaozuo  454000 ， Henan， China

Abstract:In order to study the influence of coal thickness on the acoustic emission（AE）characteristics in the process of fracture ， the samples of basic top siltstone and coal-rock combination bodies in Bultai coal mine were taken as the research object. The DS5-8b acoustic emission monitoring system was used to monitor the acoustic emission parameters during the fracture process of siltstone and coal-rock combination bodies. The results showed that the thickness of coal of the coal-rock combination bodies had an effect on the acoustic emission characteristics during the fracture process. There was a negative correlation between the peak count of AE and the thickness of coal ， and a positive correlation between the accumulated count of AE and the thickness of coal. Compared with the acoustic emission peak count and cumulative count of siltstone ， when the thickness of coal was 5 ，10，15 ，20 mm， the peak count was reduced by 50.8% ，65.8% ，74.4% and 79.8% respectively， and the cumulative count was increased by 98.8% ，354.2% ，374.7% and 516. 9% respectively. The peak signal intensity and duration time of the first wave were positively correlation with the thickness of coal of the coal-rock combination bodies ， while the duration time of the wave before the peak is negatively correlation with the thickness of coal of the coal-rock combination bodies. The research results could provide precursory information for the rock burst disasters in Shendong mining area.

Key words:coal-rock combination body;acoustic emission characteristic;uniaxial compression;waveform parameter

 不同煤厚煤岩组合体破裂过程声发射特征研究_李回贵.pdf