含孔洞混凝土单轴压缩实验的声电信号特征
Acoustic Signal Characteristic of Porous Concrete Uniaxial Compression Experiment
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摘要: 建立了含孔洞混凝土单轴压缩实验系统，通过分析含孔洞混凝土受载破裂过程的声电信号特征来揭示其破裂机理。实验发现含孔洞混凝土的破裂模式受骨料粒径和孔洞大小的影响，骨料越粗，声电信号发生突变的次数越多，孔洞越大，声电信号的峰值出现越早。材料声发射和电磁辐射水平与所受应力之间存在正相关耦合关系，但声发射与电磁辐射的变化并不完全同步。综合利用声发射和电磁辐射探测技术可以评价煤岩体的稳定性和预测预防岩爆的发生。Abstract: This paper establishes the porous concrete uniaxial compression experiment system, through the analysis of porous concrete contained the acoustic signal characteristic during rupture process to reveal its rupture mechanism. The experiment found that porous concrete rupture mode effected by the aggregate diameter and hole size, the more rough of aggregate was, the more times of acoustic and electric signal mutation were, the bigger of holes were, the earlier of acoustic and electric signal peak appears. There is a positive correlation coupling relationship between acoustic emission and electromagnetic radiation level and the stress, but the changes were not completely synchronized. Comprehensive utilization of acoustic emission and electromagnetic radiation detection technology can evaluate the coal and rock mass stability and predict rockburst.
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Keywords:
- rock burst /
- porous concrete /
- aggregate /
- acoustic emission /
- electromagnetic radiation /
- failure mode
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[1] 王恩元，何学秋，李忠辉，等. 煤岩电磁辐射技术及其应用[M].北京：科学出版社，2009. [2] 王恩元，何学秋，刘贞堂，等.煤岩变形破裂的电磁辐射规律及其应用研究[J].中国安全科学学报,2000,10(2):36-39. [3] 何学秋,聂百胜,何俊,等.顶板断裂失稳电磁辐射特征研究[J].岩石力学与工程学报，2007(S1):353-358. [4] 李忠华，潘一山，纪海汛，等.瓦斯煤层冲击地压防治技术及应用[M].北京：国防工业出版社，2009. [5] 窦林名,何学秋.冲击矿压危险预测的电磁辐射原理[J].地球物理学进展，2005(2):160-164. [6] 宁超,余锋,景丽岗.单轴压缩条件下冲击煤岩声发射特性实验研究[J].煤矿开采，2011(1):102-105. [7] 刘保县,黄敬林,王泽云,等.单轴压缩煤岩损伤演化及声发射特性研究[J].岩石力学与工程学，2009(S1):651-655. [8] 刘向峰，王来贵，何峰.含孔洞试件破坏过程的红外实验与数值实验对比分析[J].岩石力学与工程学报,2005,24(增1):5173-5177. [9] 窦林明，何学秋.冲击地压防治理论与技术[M].徐州：中国矿业大学出版社，2001.
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