Abstract：In order to study the free charge migration law of different types of coal and rock samples during the process of tensile failure，the charge monitoring system for coal and rock tensile instability and failure is developed under the frame of the Brazil disk splitting test. The mechanical characteristics and free charge migration law are obtained through the real-time monitoring process of sandstone，mudstone and coal samples during tensile instability and failure. The results show that there exist free charges during the tensile process of coal and rock mass. Charge signal abnormal area is corresponding to the stress mutation process in the samples splitting test；and the free charges produced by coal is richer than that produced by sandstone and mudstone during tensile failure. Compared with sandstone and mudstone，the residual strength of coal after fracture still makes the charge signal have larger fluctuation. Charge induction law is different between tensile and compression failure of coal and rock. One of the important reasons for the abnormal charge signal is the damage localization caused by crack propagation under the tensile stress during the tensile instability and failure of coal and rock mass.
潘一山，罗 浩，唐 治，李忠华，赵扬锋. 煤岩体拉伸失稳破坏电荷感应规律研究[J]. 岩石力学与工程学报, 2013, 32(7): 1297-1303.
PAN Yishan，LUO Hao，TANG Zhi，LI Zhonghua，ZHAO Yangfeng. STUDY OF CHARGE INDUCTION LAW OF COAL AND ROCK MASS DURING TENSILE INSTABILITY AND FAILURE. , 2013, 32(7): 1297-1303.
王秀琨，王寅生. 岩石压电性[J]. 物探与化探，1985，9(4)：274-280. (WANG Xiukun，WANG Yinsheng. Piezoelectricity of rocks[J]. Geophysical and Geochemical Exploration，1985，9(4)：274-280.(in Chinese))
[1]
KILKEEV R S. 力荷载下的岩石电场[C]// 徐玉凤译. 苏联地震预报研究文集. 北京：地震出版社，1993：31-34.(KILKEEV R S. Electric field strength of rock under the load[C]// Translated by XU Yufeng. Proceedings of Soviet Union Earthquake Prediction Research. Beijing：Seismological Press，1993：31-34.(in Chinese))
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2013, Vol. 32 
