Abstract
AbstractIn this paper, we report a detailed experimental study on the surface electric potential of coal samples during uniaxial compression, tensile fracture and three‐point bending. The experimental results show that the surface electric potential can be produced during coal deformation and rupture, and well correlated with the load, as indicated by the high correlation coeffcients ranging from 0.6 to 0.9, as well as the almost simultaneous change in surface electric potential responding to the load change. Particularly, the larger the load is, the higher the surface potential becomes, and vice versa. In addition, the electric potential distribution over the coal surface changes with the load as well as the loading time. The study of coal surface electric potential can significantly facilitate the understanding of generation mechanism of electromagnetic radiation during coal rupturing. It is necessary for the development and application of new technologies based on the coal or rock electromagnetic radiation, and eventually leads to a novel method to evaluate the stress state and the stability of coal seams in a mining field thereby to monitor and forecast coal or rock dynamic disasters.
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