Mechanical behavior and acoustic-charge inversion ofcoal rock under gas adsorption

doi:10.16265/j.cnki.issn1003-3033.2018.07.014

Abstract

Abstract: In order to further explore the mechanical behavior of coal and the inversion law of acoustic-charge under different gas adsorption pressures,and improve the method of predicting and warning of shock-outburst complex disaster,coal samples were selected from the 168 working face of Sunjiawan mine in Fuxin,and their mechanical properties,shock-outburst characteristics and acoustic-charge inversion process under different gas adsorption pressures were investigated by using an acomposite monitoring system of load-acoustic-charge-strain.The results show that with the increase of gas adsorption pressure,the impact tendency index of gas coal decreases,and the adjustment of stress before peak stress increases gradually,and the peak failure time of gas coal is prolonged,the degrees of internal damage,softening and breaking of coal sample also increase,and the dynamic disaster of gas coal likely changes from an impact into an outburst,and that the acoustic-charge high amplitude signal obtained from monitoring system has a good correspondence relationship with coal stress state in time series,and could reflect the mechanical characteristics of gas coal.

Key words: gas adsorption pressure, mechanical behavior, failure characteristics, impact tendency, acoustic charge signal

CLC Number:

X936

XIAO Xiaochun, WANG Lei, WU Di, DING Xin, FAN Yufeng, ZHAO Baoyou. Mechanical behavior and acoustic-charge inversion ofcoal rock under gas adsorption[J]. China Safety Science Journal, 2018, 28(7): 82-87.

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