基于有效冲击能量速率的煤层冲击倾向性指数研究

Study of Coal Seam Rock Burst Tendency Index under Effectively Impact Energy Rate

煤岩冲击倾向性的准确评判对于防治冲击地压具有非常重要的意义。在总结国内外煤层冲击倾向性研究成果的基础上,针对目前冲击倾向性指数未能完全反映煤层实际冲击倾向性强弱的问题,提出了综合反映能量积聚、耗散、释放过程及时间效应的有效冲击能量速率指数,并给出了评判准则。有效冲击能量速率指数与动态破坏时间、弹性能量指数、冲击能量指数和单轴抗压强度等常用指数均呈现一定的相关性。工程应用结果表明,使用该指数评判冲击倾向性强弱是科学合理的。

The accurately determination of coal and rock impact tendency was importance to rock burst prevention and control. Based on research results of coal seam impact tendency at home and abroad,to the problems that the actual coal seam impact tendency could not be reflected by impact tendency index at present,then an effectively impact energy rate index was put forward,which could be fully reflected energy accumulation,dissipation and releasing process and time effect and so on,then determination criterion was put forward. Some relativity appeared between normal index,which is about effectively impact energy rate,dynamic broken time,elastic energy index,impact energy index and uniaxial compressive strength. The field test showed that impact tendency determined by the index was reasonable.