含水煤体冲击倾向及声-电荷时频特征试验

doi:10.16265/j.cnki.issn1003-3033.2017.11.018

中国安全科学学报 ›› 2017, Vol. 27 ›› Issue (11): 103-108.doi: 10.16265/j.cnki.issn1003-3033.2017.11.018

含水煤体冲击倾向及声-电荷时频特征试验

肖晓春^1,2 教授, 金晨^1,2, 吴迪^1,2 副教授, 丁鑫^1,2, 于飞¹

1 辽宁工程技术大学力学与工程学院,辽宁阜新 123000
2 煤矿灾害动力学与控制国家重点实验室重庆大学,重庆 400044

收稿日期:2017-08-12 修回日期:2017-10-12 发布日期:2020-10-21
作者简介:肖晓春 (1979—),男,回族,内蒙古化德人,博士,教授,博士生导师,主要从事煤矿冲击地压、瓦斯突出机制及监测预警和低渗储层煤层气物理激励增采机制及方法的研究工作。E-mail:xxc7902@163.com。
基金资助:
国家自然科学基金资助(51374123,51504122);煤矿灾害动力学与控制国家重点实验室开放基金资助(2011DA105287-FW201605);2014年辽宁省优秀人才支持计划(LJQ2014043);辽宁省教育厅一般项目(LJYL045,LJYL047)。

Experimental study on burst tendency of water-bearing coal and its acoustic emission-charge time frequency domain signal characteristics

XIAO Xiaochun^1,2, JIN Chen^1,2, WU Di^1,2, DING Xin^1,2, YU Fei¹

1 School of Mechanics and Engineering, Liaoning Technical University, Fuxin Liaoning 123000, China
2 State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China

Received:2017-08-12 Revised:2017-10-12 Published:2020-10-21

摘要/Abstract

摘要： 为准确预测冲击地压,采用加载系统及信号监测系统对烘干24 h、自然含水和饱水的取自阜新某矿的3种煤样进行试验研究,探究含水煤体冲击倾向性变化规律及其与破裂过程声-电荷信号时频域特征的对应关系。结果表明:随着煤样含水率降低,冲击倾向性增强,煤体加载破坏过程声-电荷信号变化具有规律性;时域方面,煤样冲击越强,强化及峰后阶段声发射(AE)波形、电荷信号更加连续密集且幅值更高;频域方面,煤样冲击增强,强化及峰后阶段声、电荷频谱图频率向低频方向移动,且冲击越强低频段信号幅值越高。

关键词: 含水煤体, 声-电荷时频信号, 冲击倾向性, 声发射(AE)波形, 信号幅值

Abstract: In order to predict the rock burst tendency accurately, experiments were carried out on samples of water-bearing coal from Fuxin by using a loading system and signal monitoring systems. The relationships between the rock burst tendency and AE-charge time-frequency domain signals in the failure process were studied. Three conditions, drying 24 hours, natural and the saturated, were considered. The experimental results show that, as the moisture content of coal decreases, the coal rock burst tendency stronger becomes, that change in the signals is regular in the failure process, that in time domain, with coal rock burst tendency becoming stronger, AE waveform and charge are more intensive, and the amplitudes become higher at intensification stage and post-peak stage, and that in frequency domain, a stronger rock bust tendency makes frequency of AE-charge spectrogram shift to low-frequency domain, and the amplitudes of signals in low frequency state greater.

Key words: moisture content coal, acoustic emission(AE)-charge time-frequency domain signal, rock burst tendency, AE waveform, amplitude of signals

中图分类号:

X936

肖晓春教授, 金晨, 吴迪副教授, 丁鑫, 于飞. 含水煤体冲击倾向及声-电荷时频特征试验[J]. 中国安全科学学报, 2017, 27(11): 103-108.

XIAO Xiaochun, JIN Chen, WU Di, DING Xin, YU Fei. Experimental study on burst tendency of water-bearing coal and its acoustic emission-charge time frequency domain signal characteristics[J]. China Safety Science Journal, 2017, 27(11): 103-108.

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含水煤体冲击倾向及声-电荷时频特征试验

Experimental study on burst tendency of water-bearing coal and its acoustic emission-charge time frequency domain signal characteristics

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