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冲击地压防治基础是进行冲击倾向性鉴定,测定指标的准确性和合理性尤为重要。在对现行冲击能量指数分析的基础上,综合考量煤岩体峰前塑性变形能释放和有效弹性能释放时间效应,建立有效弹性能释放速度计算模型,提出基于声发射特征参数和循环加卸载载荷表征峰值前释放塑性能,利用TYJ–500KN微机控制电液私服岩石剪切流变试验系统对煤样进行循环加卸载声发射实验,通过上述表征公式拟合得到分段函数计算式,进行冲击能量指数测定实验,验证表征公式可靠性。结果表明:依据峰值卸荷表征与声发射特征参数表征结果差仅为5.27%,2种表征方式相互印证。有效弹性能释放速度与冲击能量指数、单轴抗压强度、有效弹性能成正相关,与破坏时间成负相关。从而证明利用有效弹性能释放速度鉴定冲击倾向性具有一定合理性。
The basis of rock burst control is the identification of impact propensity. It is especially important to determine the accuracy and rationality of the target. Based on the analysis of the current impact energy index, considering the release of plastic deformation energy and the release time of effective elastic energy before the peak of coal and rock mass, an effective elastic energy release rate calculation model is established. Based on the characteristic parameters of acoustic emission and cyclic loading / unloading Characterization of plastic properties before the peak release, the use of TYJ-500KN microcomputer-controlled electro-hydraulic and personal rock shearing rheology test system for coal sample loading and unloading acoustic emission experiments were fitted by the above formula to get the formula for segment function, the impact energy Index determination experiment, verification and characterization formula reliability. The results show that the difference between peak unloading characterization and acoustic emission characteristic parameter characterization is only 5.27%, and the two kinds of characterization methods confirm each other. The release rate of effective elastic energy has a positive correlation with impact energy index, uniaxial compressive strength and effective elastic energy, and negative correlation with failure time. This proves that it is reasonable to identify the impact propensity by the release rate of effective elastic energy.