中国安全科学学报 ›› 2020, Vol. 30 ›› Issue (3): 115-121.doi: 10.16265/j.cnki.issn1003-3033.2020.03.018

• 安全工程技术 • 上一篇    下一篇

瓦斯环境中煤体破裂AE信号频带能量特征研究

赵敖寒1,2, 马衍坤**1,2 副教授, 刘健1,2 教授, 陈德重3, 袁宏永4 教授, 付明4 研究员   

  1. 1.安徽理工大学 省部共建深部煤矿采动响应与灾害防控国家重点实验室,安徽 淮南 232001;
    2.安徽理工大学 能源与安全学院,安徽 淮南 232001;
    3.山东能源新矿集团 华丰煤矿,山东 泰安 271000;
    4.清华大学 合肥公共安全研究院,安徽 合肥 230601
  • 收稿日期:2019-12-15 修回日期:2020-02-20 出版日期:2020-03-28 发布日期:2021-01-26
  • 通讯作者: **马衍坤(1985—),男,山东肥城人,博士,副教授,主要从事水力压裂方面的研究。E-mail:mykunbest@126.com。
  • 作者简介:赵敖寒(1996—),男,安徽宿州人,硕士研究生,研究方向为煤岩力学。E-mail:ohanzhao@163.com。
  • 基金资助:
    国家重点研发计划项目(2018YFC0808100);国家自然科学基金资助(51934007,51674009)。

Energy characteristics of AE signal frequency band during coal rupture in mines with gas

ZHAO Aohan1,2, MA Yankun1,2, LIU Jian1,2, CHEN Dezhong3, YUAN Hongyong4, FU Ming4   

  1. 1. State Key Laboratory Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology, Huainan Anhui 232001, China;
    2. School of Energy and Safety Engineering, Anhui University of Science and Technology, Huainan Anhui 232001, China;
    3. Huafeng Coal Mine, Shandong Energy Xinwen Mining Group, Taian Shandong 271000, China;
    4. Hefei Public Security Research Institute, Tsinghua University, Hefei Anhui 230601, China
  • Received:2019-12-15 Revised:2020-02-20 Online:2020-03-28 Published:2021-01-26

摘要: 为分析瓦斯环境对煤体受载破裂过程中的声发射(AE)频带能量的影响,以构造煤体为研究对象,利用自行研制的含瓦斯煤体试验装置进行单轴压缩试验,采用快速傅里叶变换(FFT)与小波包分析的信号处理方法,得到不同瓦斯压力下的煤体破裂AE频带能量特征。结果表明:瓦斯压力越大,煤体破裂产生的AE信号主频越大,频带越窄,频谱逐渐由复杂多峰形态转变为单峰形态;瓦斯环境下,随着受载应力的增加,频带逐渐丰富,频谱逐渐左移;当瓦斯压力变化时,2.92~4.38、4.38~5.84、7.3~8.76 kHz等3个频带的能量变化趋势较为明显;处于2.92~4.38 kHz频带内能量的变化量与4.38~5.84、7.3~8.76 kHz能量的变化量之和基本相等,且呈现相反的变化趋势;当构造煤体所受应力增加时,4.38~5.84与7.3~8.76 kHz分别为能量增加与减少幅度最大的频带;可以将2.92~4.38、4.38~5.84 kHz作为研究构造煤体在瓦斯环境中受载破坏的特征频带。

关键词: 瓦斯压力, 煤体, 声发射(AE), 单轴压缩, 频带能量

Abstract: In order to analyze gas's influence on AE band energy during coal rupture under loading, with structural coal as research object, uni-axial compression test was carried out by using self-developed gas-containing coal test device. Then, signal processing method of fast Fourier transform (FFT) and wavelet packet analysis was used to obtain characteristics of AE band energy during coal rupture under different gas pressure. The results show that the greater gas pressure is, the larger main frequency of AE signal is, the narrower frequency band is, and spectrum transforms gradually from a complex multi-peak form to a single peak form. When three is gas, with the increase of loading stress, frequency band enriches and spectrum shifts to left gradually. As gas pressure changes, energy of 2.92-4.38 kHz, 4.38-5.84 and 7.3-8.76 kHz changes significantly while that in 2.92-4.38 kHz is basically same as the sum of 4.38-5.84 and 7.3-8.76 kHz, showing an opposite trend. When stress of structural coal increases, 4.38-5.84 and 7.3-8.76 kHz indicate the largest increase and decrease of energy respectively. 2.92-4.38 kHz and 4.38-5.84 kHz can be used as characteristic frequency bands to study damage of structural coal under loading in mines with gas.

Key words: gas pressure, coal, acoustic emission (AE), uni-axial compression, frequency band energy

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