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| EXPERIMENTAL RESEARCH ON ELECTROMAGNETIC EFFECTS FROM SELF-EXPANSION CRACKING OF GRANITE |
| LIN Peng，KANG Shengzu，WANG Cheng，ZHENG Dong |
| (State Key Laboratory of Hydroscience and Engineering，Tsinghua University，Beijing 100084，China) |
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Abstract This paper proposes an experimental system to monitor the phenomenon of electromagnetic radiation during the granite failure. By conducting the self-expanding experiment of granite，the electromagnetic response on basis of cracking procedure is studied. The experimental results show that：in rock main rupture instantly，the largest electromagnetic radiation occurs with value of about 0.2 mV. The propagation，coalescence of microcracks lead rock to catastrophe failure accompanied by a strong electromagnetic signal. Electromagnetic radiation has directionality during rock fracture process；the frequency of the electromagnetic signal is low；and there is a characteristic frequency for releasing radiate energy in rupture process.
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Received: 20 May 2013
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2013, Vol. 32 
