煤岩破坏表面电位特征规律研究
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摘要
研究了煤岩在单轴压缩、拉伸、三点弯曲等不同破坏方式下的表面电位特征和规律,初步探讨了煤岩破坏表面电位机理.结果表明,煤岩在受载破坏时能够产生表面电位,并且表面电位与载荷具有较好的一致性,二者之间的相关系数在0.6~0.9以上,可达到高度相关;表面电位信号一般随载荷的增加而增强,随载荷的降低而减弱.试样上不同电极处测得的表面电位信号强度是不完全相同的,是随载荷及煤样的破坏状态的变化而变化的.根据表面电位与载荷之间的相关关系,可以用表面电位信号来反映煤岩受载破坏的状态.
The surface potential of coal was studied during different fracture modes,including uniaxial compression,tensile fracture and three-point bending.The results show that a surface potential is produced during the fracture of coal and that the surface potential has a good correspondence to the load: the correlation coefficient between them can be as great as 0.6 to 0.9.The change in load induces the change in the surface potential.The larger the load the higher the surface potential becomes,and vice versa.The magnitude of the surface potential is not the same at electrodes located in different positions on the coal sample.The differences also change along with the change in load and the fracture state of the coal sample.Based on the correlation between surface potential and load,the status of a coal fracturing under load may be determined from the surface potential.
The surface potential of coal was studied during different fracture modes,including uniaxial compression,tensile fracture and three-point bending.The results show that a surface potential is produced during the fracture of coal and that the surface potential has a good correspondence to the load: the correlation coefficient between them can be as great as 0.6 to 0.9.The change in load induces the change in the surface potential.The larger the load the higher the surface potential becomes,and vice versa.The magnitude of the surface potential is not the same at electrodes located in different positions on the coal sample.The differences also change along with the change in load and the fracture state of the coal sample.Based on the correlation between surface potential and load,the status of a coal fracturing under load may be determined from the surface potential.
引文
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[3]吴立新,王金庄.煤岩受压红外热象与辐射温度特征实验[J].中国科学:D辑,1998,28(1):41-46.WU Li-xin,WANG Jin-zhuang.Experimental studyof infrared radiation features of coal and rocks underloading[J].China Science:D,1998,28(1):41-46.
[4]樊栓保.国内外煤与瓦斯突出预测的新方法[J].矿业安全与环保,2000,27(5):17-19.FAN Shuan-bao.New methods for coal and gas out-burst forecast in home and abroad[J].Mining Safety&Environmental Protection,2000,27(5):17-19.
[5]FRID V I,SHABAROV A N,PROSKURYAKOVV H,et al.Formation of electromagnetic radiation incoal stratum[J].J Mining Science,1992,28(2):139-145.
[6]何学秋,刘明举.含瓦斯煤岩破坏电磁动力学[M].徐州:中国矿业大学出版社,1995:22-38.
[7]王恩元.含瓦斯煤破裂的电磁辐射和声发射效应及其应用研究[D].徐州:中国矿业大学安全工程学院,1997.
[8]何学秋,王恩元,聂百胜,等.煤岩流变电磁动力学[M].北京:科学出版社,2003:389-407.
[9]FRID V.Rockburst hazard forecast by electromag-netic radiation excited by rock fracture[J].Rock Me-chanics and Rock Engineering,1997,30(4):229-236.
[10]王恩元,何学秋,聂百胜,等.电磁辐射法预测煤与瓦斯突出原理[J].中国矿业大学学报,2000,29(3):225-229.WNAG En-yuan,HE Xue-qiu,NIE Bai-sheng,etal.Principle of predicting coal and gas outburst u-sing electromagnetic emission[J].Journal of ChinaUniversity of Mining&Technology,2000,29(3):225-229.
[11]王恩元,何学秋,刘贞堂,等.煤岩动力灾害电磁辐射监测仪及其应用[J].煤炭学报,2003,28(4):366-369.WANG En-yuan,HE Xue-qiu,LIU Zhen-tang,etal.Electromagnetic radiation detector of coal or rockdynamic disasters and its application[J].Journal ofChina Coal Society,2003,28(4):366-369.
[12]АВ波诺马廖夫.岩石形变与破裂的电现象[C]//M A萨多夫斯基.苏联地震预报研究文集.张肇诚,何世海,张炜,等,译.北京:地震出版社,1993:80-87.
[13]吴小平,施行觉,郭自强.花岗岩压缩带电的实验研究[J].地球物理学报,1990,33(2):208-211.WU Xiao-ping,SHI Xing-jue,GUO Zi-qiang.Study on the electrification of granite samples undercompression[J].Chinese Journal of Geophysics,1990,33(2):208-211.
[14]郝锦绮,刘力强,龙海丽,等.双轴压力下岩样自电位变化实验的新结果[J].地球物理学报,2004,47(3):475-482.HAO Jin-qi,LIU Li-qiang,LONG Hai-li,et al.New result of the experiment on self-potentialchange of rocks under biaxial compression[J].Chi-nese Journal of Geophysics,2004,47(3):475-482.
[15]龙海丽.岩石破裂过程自电位异常的研究[D].北京:中国地震局地球物理研究所,2003.
[16]ENOMOTO Y,SHIMAMOTO T,TSUTUMI A,et al.Rapid electric chargefluctuation prior to rockfracturing:its potential use for an immediateearth-quake precursor[C]//HAYAKAWA M,FUJINA-WA Y.Proceedings ofInternational Workshop on E-lectromagnetic Phenomena Related to Earth-quakePrediction.Tokyo:Terra Scientific PublishingCo,1993:64-65.
[17]TAKEUCHI A,BOBBY W S L,FRIEDEMANN TF.Current and surface potential induced by stress-activated positive holes in igneous rocks[J].Physicsand Chemistry of the Earth,2006,(31):240-247.
[18]李忠辉.受载煤体变形破裂表面电位效应及其机理的研究[D].徐州:中国矿业大学安全工程学院,2007.
[19]韩德馨,任德贻,王延斌,等.中国煤岩学[M].徐州:中国矿业大学出版社,1996:67-73.
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