Experimental study on fracture charge scale effect of coal specimen under uniaxial compression

doi:10.16265/j.cnki.issn1003-3033.2018.04.022

Abstract

Abstract: In order to study the difference in the occurrence and development of fractures in coal samples different in size, experiments were performed. Under uniaxial compression conditions, the relationship between the size of coal and the charge signal of coal fracture was studied by charge induction technology. The results show that electric charge per unit volume is a power function of the volume under uniaxial compression and electric charge per unit area is a power function of the area under uniaxial compression, that the existence of charge scale effect of coal specimen is due to the heterogeneity of coal samples, that there is low-level preexisting fracture in large volume or area coal specimen, so the probability of the expansion of original cracks and the generation and expansion of new cracks is greater in coal samples of large volume or area, and the numerous cracks cause the generation of more electrostatic charges.

Key words: fracture of coal, scale effect, quantity of electric charge of unit volume, power function, quantity of electric charge of unit area, initial fissure

CLC Number:

X936

WANG Yalin, PAN Yishan, MA Xiao, ZHU Xiaojing, LUO Hao. Experimental study on fracture charge scale effect of coal specimen under uniaxial compression[J]. China Safety Science Journal, 2018, 28(4): 128-132.

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