文章摘要
赵扬锋, 丁 玲, 刘玉春, 李 兵.循环荷载作用下煤岩电荷感应与微震信号变化规律Journal of Water Resources and Water Engineering[J].,2023,34(5):172-182
循环荷载作用下煤岩电荷感应与微震信号变化规律
Variation law of charge induction and microseismic signals of coal and rock under cyclic loading
  
DOI:10.11705/j.issn.1672-643X.2023.05.20
中文关键词: 煤岩失稳破坏  循环荷载  电荷感应  微震信号  时频特征
英文关键词: coal and rock unstable failure  cyclic loading and unloading  charge induction  microseismic signals  time-frequency characteristics
基金项目:国家自然科学基金项目(52074142);辽宁省自然科学基金项目(2022-MS-401)
Author NameAffiliation
ZHAO Yangfeng1,2, DING Ling1, LIU Yuchun3, LI Bing1 (1.辽宁工程技术大学 力学与工程学院 辽宁 阜新 123000 2.辽宁省矿山沉陷灾害防治重点实验室, 辽宁 阜新 123000 3.辽宁工程技术大学 理学院 辽宁 阜新 123000) 
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中文摘要:
      为进一步提高深部地下工程中煤岩失稳破坏监测预警的针对性和准确性,采用自主研发的多通道电荷感应和微震综合监测系统,监测和分析在不等幅循环荷载作用下煤岩变形破裂过程中电荷感应和微震信号的时、频特性和能量特征,并与单轴压缩实验进行对比。结果表明:循环荷载下煤岩在不同阶段的电荷感应和微震信号各具特点,卸载段会产生较多微破裂和损伤,煤样在发生多裂纹贯穿劈裂破坏前会频繁出现峰值较小的电荷感应信号,需特别注意。对微震信号傅里叶变换进行频谱分析,发现微震信号频谱特征能够很好地反映煤样内部裂隙的扩展状态,并且主频幅值的增高与微震信号的增强具有同步性。采用电荷感应和微震信号共同划定煤岩的受载阶段,可以得到更加准确的失稳预警信息。
英文摘要:
      In order to improve the relevance and accuracy of the monitoring and early warning of coal and rock unstable failure in deep underground engineering, the charge induction and microseismic signals generated by coal and rock in the deformation and fracture process under cyclic loading were monitored simultaneously by a self-developed multi-channel monitoring system, and the time-frequency characteristics and energy features of the signals were analyzed and compared with those of the uniaxial compression tests. The results show that the charge induction and microseismic signals of coal and rock under cyclic loading have different characteristics at different loading stages, more microfractures are generated in the cyclic unloading section, and charge induction signals with small peak values frequently occur before multiple splitting fractures generate in the coal samples. Of particular note is that Fourier transform and spectrum analysis of the signals show that the variation characteristics of the spectral band and spectral amplitude of the microseismic signals can very well reflect the internal fracture extension of the coal samples, and the increase of the amplitude of the main frequency is synchronous with that of the amplitude of microseismic signals. The charge induction and microseismic signals can jointly define the loading process of the coal and rock, which can provide more accurate early warning information on rock failures.
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