煤岩变形破裂电磁和微震信号关联响应机理及特征研究
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摘要
本文采用理论分析、实验研究和现场测试相结合的方法，研究了煤岩变形破裂过程电磁和微震信号的关联响应机理及变化特征。根据电磁场理论、断裂力学理论和损伤理论，分析煤岩裂纹扩展力学特征，研究低频电磁和微震信号的产生机理及影响因素。利用ZDKT-1型煤岩动力灾害实验模拟系统测试了不同加载方式（恒速、变速、分级加载、冲击加载）下煤岩变形破裂电磁和微震信号，通过整体经验模态分解（EEMD）和小波阈值去噪方法，确定电磁和微震信号的高、低频模态，分析了加载条件和试件组分及结构对电磁和微震信号的影响规律。采用相关性分析方法，研究了电磁、微震和应力之间的相关性。依据能量加速释放和临界点理论，分析了电磁和微震的频率、能量关联响应特征，提出了基于电磁和微震关联响应的煤岩失稳破坏预测方法。现场测试了爆破掘进下工作面煤体电磁和微震信号，并对利用电磁和微震信号联合预测震源方位进行了初步尝试。
The association response mechanisms and change characteristics of electromagnetic andmicroseismic signals in the process of deformation and fracture of coal or rock are studied byadopting the method of a combination of theoretical analysis, experimental research and field testin the dissertation. According to electromagnetic field theory, fracture mechanics and damagetheory, the mechanical characteristics of coal and rock crack propagation are analyzed.Meanwhile, the generation mechanism and influence factors of low frequency electromagneticsignals and microseismic signals are studied. Afterwards, the electromagnetic and microseismicsignals during the deformation and fracture of coal and rock under different loading (constantvelocity loading, variable velocity loading, multi-stage loading, impact loading) are tested byusing ZDKT-1coal and rock dynamic disasters experimental simulation system. Through theEnsemble Empirical Mode Decomposition (EEMD) and wavelet threshold denoising method, thehigh and low frequency mode of electromagnetic and microseismic signals are determined. Andthe effect of loading conditions and the composition and structure of specimens onelectromagnetic and microseismic signals is analyzed. Then, the correlation of electromagneticsignals, microseismic signals and stress is studied by means of the correlation analysis. Theassociation response characteristics of electromagnetic and microseismic signals in the aspect offrequency and energy are analyzed based on the energy accelerated release and critical pointtheory, and the prediction method of instability and failure of coal and rock on the basis ofassociation response of electromagnetic and microseismic signals is proposed. Finally, the electromagnetic and microseismic signals of coal fracture induced by blasting excavation inheading face are investigated, and the joint prediction of the source location by usingelectromagnetic and microseismic signals is preliminarily attempted.
The association response mechanisms and change characteristics of electromagnetic andmicroseismic signals in the process of deformation and fracture of coal or rock are studied byadopting the method of a combination of theoretical analysis, experimental research and field testin the dissertation. According to electromagnetic field theory, fracture mechanics and damagetheory, the mechanical characteristics of coal and rock crack propagation are analyzed.Meanwhile, the generation mechanism and influence factors of low frequency electromagneticsignals and microseismic signals are studied. Afterwards, the electromagnetic and microseismicsignals during the deformation and fracture of coal and rock under different loading (constantvelocity loading, variable velocity loading, multi-stage loading, impact loading) are tested byusing ZDKT-1coal and rock dynamic disasters experimental simulation system. Through theEnsemble Empirical Mode Decomposition (EEMD) and wavelet threshold denoising method, thehigh and low frequency mode of electromagnetic and microseismic signals are determined. Andthe effect of loading conditions and the composition and structure of specimens onelectromagnetic and microseismic signals is analyzed. Then, the correlation of electromagneticsignals, microseismic signals and stress is studied by means of the correlation analysis. Theassociation response characteristics of electromagnetic and microseismic signals in the aspect offrequency and energy are analyzed based on the energy accelerated release and critical pointtheory, and the prediction method of instability and failure of coal and rock on the basis ofassociation response of electromagnetic and microseismic signals is proposed. Finally, the electromagnetic and microseismic signals of coal fracture induced by blasting excavation inheading face are investigated, and the joint prediction of the source location by usingelectromagnetic and microseismic signals is preliminarily attempted.
引文
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