煤样变形破坏峰值前后电磁辐射特征研究
首发时间:2006-09-15
摘要:煤岩在变形破坏过程中产生电磁辐射现象。试验表明,电磁辐射水平与应力水平的关系密切,不同煤岩峰前阶段的电磁辐射随着应力的增加而起伏增强;峰后阶段电磁辐射在峰值强度后随着应力的降低呈上升的趋势,之后随着应力下降,电磁辐射逐渐下降。煤岩变形破坏峰后电磁辐射与峰前电磁辐射的比值可作为冲击倾向的电磁辐射指数。该指数与现有的冲击倾向指标有很好的线性关系,是电磁辐射预测煤岩冲击倾向性及冲击危险程度的重要指标,这为冲击矿压的防治打下良好的基础。
关键词: 冲击破坏 电磁辐射 峰前 峰后 冲击倾向性 电磁辐射冲击倾向指数
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The Study on The Electromagnetic Emission Character on Pre- and Post-peaking Phase of The Deformation and Failure of Coal
Abstract:Electromagnetic Emission (EME) is caused during the deformation and failure of rock and coal. Experimental study shows that the EME is well connected with the stress state. The EME usually increases with the stress increasing before the peak phase of rock and coal. On the post-peaking phase, The EME first rises and then falls with the stress decreasing gradually . The ratio of the post-peaking phase and pre-peaking phase of the EME can be used as a exponent to evaluate the rock burst tendency. The exponent has excellent linear correlation with the existing rock burst tendency index and has become a weighty index to forecast the rock burst tendency and the degree of the danger. It lays a good foundation for rock burst prevention.
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No.8370611158313201****
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