| 煤岩破坏声发射强度长程相关性和多重分形分布研究 |
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| 引用本文： | 许福乐,王恩元,宋大钊,宋晓艳,魏明尧.煤岩破坏声发射强度长程相关性和多重分形分布研究[J].岩土力学,2011,32(7):2111-2116. |
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| 作者姓名： | 许福乐 王恩元 宋大钊 宋晓艳 魏明尧 |
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| 作者单位： | 中国矿业大学 煤炭资源与安全开采国家重点实验室,江苏徐州 221008;中国矿业大学 安全工程学院,江苏徐州 221008 |
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| 基金项目： | 国家“十一五”科技支撑计划，教育部新世纪优秀人才支持计划，煤炭资源与安全开采国家重点实验室自主研究项目，中国矿业大学青年科研基金资助项目 |
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| 摘 要： | 通过单轴加载煤岩破坏全过程声发射试验,运用多重分形消除趋势波动分析法(MF-DFA),分析了声发射强度序列的长程相关性及多重分形特征,在此基础上研究了不同应力水平下声发射强度序列长程相关指数H的变化趋势。结果表明:声发射强度时间序列内部波动不是完全随机的现象,而是由内在自相似机制决定的长程相关过程,其波动是一个有序的多重分形分布;H的变化与煤岩体的变形破坏过程能够较好的对应,声发射强度H值的"最大—减小"模式可以作为煤岩体失稳事件的前兆,这为利用声发射进行煤岩体稳定性现场监测预报提供了新的理论依据及方法。
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| 关 键 词： | 煤岩破坏 声发射强度 长程相关性 多重分形 |
| 收稿时间： | 2010-07-15 |
Long-range correlation and multifractal distribution of acoustic emission of coal-rock |
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| XU Fu-le,WANG En-yuan,SONG Da-zhao,SONG Xiao-yan,WEI Ming-yao.Long-range correlation and multifractal distribution of acoustic emission of coal-rock[J].Rock and Soil Mechanics,2011,32(7):2111-2116. |
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| Authors: | XU Fu-le WANG En-yuan SONG Da-zhao SONG Xiao-yan WEI Ming-yao |
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| Institution: | 1. State Key Laboratory of Coal Resources and Mine Safety, China University of Mining & Technology, Xuzhou, Jiangsu 221008, China; 2. School of Safety Engineering, China University of Mining & Technology, Xuzhou, Jiangsu 221008, China |
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| Abstract: | Acoustic emission tests of coal-rock specimens under uniaxial compression were carried out;then the long-range correlation and multifractal characteristics of acoustic emission strength sequence were analyzed by multifractal detrended fluctuation analysis method(MF-DFA).On this basis,the trend of long-range correlation exponent H of AE strength sequence with different stress levels was studied.The results show that the inner fluctuation of AE sequence is a well-regulated multifractals,which is rather a long... |
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| Keywords: | coal-rock failure strength of acoustic emission(AE) long-range correlation multifractals |
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