煤岩破坏表面电位特征规律研究  

Study on Characteristics and Rules of Surface Potential During Coal Fracture

作　　者：李忠辉[1] 王恩元[1] 刘贞堂[1] 宋晓艳[1] 李艳娜[1] 

机构地区：[1]中国矿业大学安全工程学院,煤炭资源与安全开采国家重点实验室,江苏徐州221008

出　　处：《中国矿业大学学报》2009年第2期187-192,共6页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(50427401);国家重点基础研究发展计划(973)项目(2005cb221505);国家高技术研究发展计划(863)项目(2006AA06Z119);国家"十一五"科技支撑计划(2006BAK03B02-04;2007BAK29B01);教育部新世纪优秀人才支持计划(NCET-06-0477);中国矿业大学青年科研基金(2007A002);中国矿业大学煤炭资源与安全开采国家重点实验室开放基金(07KF12)

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 corre- spondence 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.

关 键 词：煤岩 受载破坏 表面电位 规律 机理 

分 类 号：TD713[矿业工程—矿井通风与安全] P319.19[天文地球—固体地球物理学]