煤层冲击倾向性与危险性评价指标研究

针对冲击倾向性指标不能完全反映实际煤层冲击危险程度的问题,提出了考虑时间效应的冲击能量速度指标、临界软化区域系数、临界应力系数3项新的指标,并与动态破坏时间、弹性能指数、冲击能指数和单轴抗压强度等4项传统的冲击倾向性指标结合,用于判断与评估煤层冲击危险性。煤样试验表明,其一定程度上解决了冲击倾向性判别结果误差大、离散性等难题,提高了煤层冲击危险性评判的精确性与可靠性。

Research on evaluation indices for impact tendency and danger of coal seam

Aiming at the rockburst tendency indices could’t completely impact dangerous degree of coal seam，the new impact energy speed indicator considering the time effect，the critical soften areas coefficient and the critical stress coefficient were put forward.Four traditional indices such as dynamic damage time，elastic energy index，impact energy index and uniaxial compressive strength in combined with the proposed three new indices were used to estimate the impact tendency risk of the coal seam.The test results of the coal samples show that the three new evaluation indices and the traditional indices，to a certain extent，are able to accurately assess the impact tendency and hazard from rock burst of the coal seam.