Abstract Obtaining the bursting liability is essential for rock burst mitigation. To reasonably evaluate the bursting liability of coal in deep coal mining, a new modified bursting energy index considering rebound and damage effects of rock is proposed. Then, uniaxial compressive tests of gypsum–rock combination specimens with different rock types are conducted for researching the energy evolution and bursting liability. Third, the traditional bursting energy index K E and modified bursting energy index K ED are compared. At last, the reasonability of K ED is verified through PFC2D simulation. Results show: (1) When evaluating the bursting liability of coal–rock combination, the rebound and damage effects of rock must be considered. (2) The uniaxial compressive strength of gypsum–rock combination specimen nonlinearly increases with increasing rock strength, but the dynamic failure duration exponentially decreases. (3) K E and K ED all increase linearly when the rock strength increases. (4) The slope of fitting curve of K ED is smaller than that of K E, indicating that the bursting liability calculated by K E is strengthened. (5) PFC2D simulation shows that K ED decreases with increasing number of drilling hole in the coal component. When using K ED to evaluate the bursting liability of coal–rock combination, it is more reasonable and applicable.

中文翻译：

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一种考虑岩石回弹和损伤效应的煤岩组合试件爆破评价新指标

摘要 获得爆破责任是减轻岩爆的必要条件。为合理评价深部煤矿开采煤体的爆破能力，提出了一种考虑岩石回弹和损伤效应的修正爆破能指数。然后，对不同岩石类型的石膏-岩石组合试件进行单轴压缩试验，研究其能量演化和爆破倾向。第三，比较了传统的爆破能指数KE和修正的爆破能指数K ED 。最后通过PFC2D仿真验证了K ED的合理性。结果表明：（1）在评价煤岩组合的爆破倾向时，必须考虑岩石的回弹和破坏效应。(2) 石膏-岩石组合试件的单轴抗压强度随着岩石强度的增加呈非线性增加，但动态破坏持续时间呈指数下降。(3) 岩石强度增加时，KE 和K ED 均呈线性增加。(4) K ED 拟合曲线的斜率比KE 小，说明KE 计算的爆破倾向得到加强。(5) PFC2D 模拟表明，K ED 随着煤组分中钻孔数的增加而减小。用K ED 评价煤岩组合的爆破倾向时，更合理、更适用。表明 KE 计算的爆破倾向得到加强。(5) PFC2D 模拟表明，K ED 随着煤组分中钻孔数的增加而减小。用K ED 评价煤岩组合的爆破倾向时，更合理、更适用。表明 KE 计算的爆破倾向得到加强。(5) PFC2D 模拟表明，K ED 随着煤组分中钻孔数的增加而减小。用K ED 评价煤岩组合的爆破倾向时，更合理、更适用。