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Dynamic tendency and EME critical value of seam and rock in deep mining section

GAO Ming-shi,DOU Lin-ming,ZHANG Nong,XU Xing-liang,ZHENG Bai-sheng(School of Energy and Safety Engineering,China University of Mining and Technology,Xuzhou 221008,China)  
The paper had study on the dynamic tendency of the seam and rock in No.Ji-2 mining section in No.11 Mine of Pingdingshan Coal Mining Group.The dynamic failure time T_D,the elastic energy index W_(ET) and bump energy index K_S were measured.The paper determined the classification of the pressure bump for the coal and rock in the mining section.Meanwhile,the paper had obtained the law of the initial bump and bump failure.The paper determined the EME critical value and pulse numbers of the dynamic failure for the coal and rocks.
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