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《Journal of Disaster Prevention and Mitigation Engineering》 2013-01
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Experimental Study of Charge Induction in Process of Coal Deformation and Fracture in Different Mines

ZHAO Yang-feng,PAN Yi-shan,LUO Hao,LI Guo-zhen(School of Mechanics and Engineering,Liaoning Technical University,Fuxin 123000,China)  
By the experimental system for collecting the charge-induced signal of the coal,the law of charge induction of coal in the different mine in process of the coal deformation and fracture is studied under different loading rates in laboratory.The experimental results show that the charge-induced signal is generated in the initial load of coal.With the increase of the loading stress level,the charge-induced signal is generated constantly,and the signal amplitude increases.Before and after the peak stress of coal,the strongest charge-induced signal is generated,and the signal is also the most abundant.After the main rupture of coal,the evident charge-induced signal is still generated,but the signal amplitude is smaller.The stronger signal of charge induction produces during coal stress mutation.The higher compressive strength of the coal and the stronger bump-prone of the coal are,the stronger the charge-induced signal is and the longer the signal duration is.The greater the loading rate is,the stronger the charge-induced signal is.Our result suggests that the charge production is relation to the deformation and fracture of coal and coal type,the coal damage degree under load may be determined from the charge-induced signal.
【Fund】: 国家自然科学基金(51274114、11172121、50704020);; 辽宁省博士启动基金(20121085)资助
【CateGory Index】: TD315
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