Affiliations: State Key Lab of Control and Simulation of Power Systems and Generation Equipments, Department of Electrical Engineering, Tsinghua University, Beijing, China
Correspondence:
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Corresponding author: Songling Huang, State Key Lab of Control and Simulation of Power Systems and Generation Equipments, Department of Electrical Engineering, Tsinghua University, Haidian District, Beijing 100084, China. Tel./Fax: +86 10 62772131; E-mail:huangsling@tsinghua.edu.cn
Abstract: Electromagnetic emission signal induced in fractured
rocks has a wide frequency band, and the change in signal amplitude is very
severe. In this paper, based on the analysis of the stress change at the
crack tip, the stress excited electrical dipole (SEED) model had been
established. Then the self-expanding destructive experiments were carried
out by different rocks. The simulation results based on the model had been
indicated that the intensity of the signal is closely related to the
variation of the stress near the crack tip. The frequency of the signal is
not only related to the mode of the crack, but also the material properties.
Keywords: Electromagnetic emission, fracture, rock, stress excited, electrical dipole
