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为完善冲击地压灾害的预测判据,在单轴压缩条件下,通过试验研究煤体冲击倾向性指标K与煤体破裂产生的电荷之间的关系。结果表明,随着应力峰后电荷脉冲数减少或累积电荷量减少,K值增大,煤样冲击倾向性增强;随着应力峰后电荷变化率增大,K值增大;煤样K值越大表示相应工程地质煤岩体的临界塑性区深度与临界荷载越小,冲击地压发生的可能性越大;因此,可将应力峰后电荷特征相关参数作为煤体冲击倾向性强弱及冲击地压发生难易程度的初步判定依据。
In order to improve the predicting criterion of rock burst, under uniaxial compression, the relationship between the index K of coal impact tendency and the charge generated by rupture of coal is studied through experiments. The results show that the K value increases and the impact tendency of coal samples increases with the decrease of the charge pulse number or the accumulated charge amount after the stress peak. The K value increases with the change of charge after the stress peak. The K value The larger the larger the critical plastic zone depth and critical load of the corresponding engineering geological rock mass, the more likely the rock burst will occur. Therefore, the relevant parameters of post-peak charge characteristics can be taken as the impact strength of coal body and Rock burst to produce a preliminary determination of the degree of difficulty.