| 小波去噪含水煤岩单轴压缩红外热像特征 |
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| 引用本文： | 宫伟力,何鹏飞,江涛,张德祥.小波去噪含水煤岩单轴压缩红外热像特征[J].华中科技大学学报(自然科学版),2011(6):10-14,23. |
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| 作者姓名： | 宫伟力 何鹏飞 江涛 张德祥 |
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| 作者单位： | 深部岩土力学与地下工程国家重点实验室;中国矿业大学(北京)力学与建筑工程学院; |
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| 基金项目： | 国家重点基础研究发展计划资助项目(2006CB202200); 教育部创新团队发展计划资助项目(IRT0656) |
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| 摘 要： | 研究红外热像的多步骤滤波去噪技术以及基于红外热像的含水煤岩单轴压缩损伤特征分析.对试验室尺度煤岩试样进行了浸水饱和、单轴加载试验与红外热成像探测.对在试验中得到的红外热像,首先利用中值滤波去除脉冲噪声;然后利用小波多分辨分析算法去除热像中的相干噪声.研究结果表明:红外图像温度分布的不同模式表征了不同的损伤阶段,即随机分布的小尺度高低温区代表压密阶段;大尺度集中高温区是破坏的早期信号;贯通性大尺度高温区是破坏的临界点;孤立大尺度低温区表示由微破裂汇合而成的塑性损伤,是损伤局部化的表征;贯通的大尺度低温区代表宏观破坏.浸水煤样有较大的原始损伤;在压密、弹性、微裂纹稳定扩展、非线性破坏等各个峰前阶段的损伤尺度与扩展速率大于不含水煤岩;在峰值后只有应变软化阶段,以突然失稳形式破坏.
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| 关 键 词： | 红外热像 煤岩 小波 损伤 单轴压缩 |
Infrared thermography of saturated coal rock under uniaxial compression based on wavelet denoising |
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| Gong Weili, He Pengfei, Jiang Tao Zhang Dexiang.Infrared thermography of saturated coal rock under uniaxial compression based on wavelet denoising[J].JOURNAL OF HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY.NATURE SCIENCE,2011(6):10-14,23. |
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| Authors: | Gong Weili He Pengfei Jiang Tao Zhang Dexiang |
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| Institution: | Gong Weili1,2 He Pengfei1,2 Jiang Tao2 Zhang Dexiang1,2(1 State Key Laboratory for Geomechanics and Deep Underground Engineering,Beijing 100083,China,2 School of Mechanics and Civil Engineering,China University of Mining and Technology,China) |
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| Abstract: | Development of multi-step filtering and denoising techniques on infrared(IR) image and thermography characterization of damage for the uniaxially loaded water-bearing coal rock specimens were presented.The laboratory-scale coal specimens were emerged in water saturated within different duration and then under uniaxial compression tests and infrared thermovision.The obtained raw thermographies were processed by using a 2D median filter for removing the pulsation noises.For removing coherent noises,a multi-re... |
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| Keywords: | infrared thermography coal rock wavelet damage uniaxial compression |
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