瓦斯煤层冲击危险性改进型综合指数评价方法及应用

Improved comprehensive index evaluation method and its application on rockburst hazard of gas coal seam

为研究瓦斯对煤层冲击危险性的影响,研制了煤样瓦斯充气装置,提出含瓦斯煤冲击倾向性测试方法。测得瓦斯压力分别为0、0.5、1.0、1.5、2.0 MPa下,煤样的单轴抗压强度、动态破坏时间、冲击能量指数和弹性能量指数4个反映其冲击倾向性的指标,发现煤的冲击倾向性随着其内部瓦斯压力的增加而减弱。基于冲击危险性综合指数评价方法,考虑瓦斯对煤层冲击危险性的影响,将煤层瓦斯属性作为一类地质因素,将瓦斯抽采效果作为一类开采技术条件,提出一种含瓦斯煤冲击危险性改进型综合指数评价方法,并利用该方法评价了某矿二盘区高瓦斯煤层的冲击危险性,利用改进型综合指数法评价高瓦斯煤层冲击危险性时,地质因素和开采技术因素评价结果具有较好的一致性。

In order to study the influence of gas on the rockburst hazard of coal seam,a gas inflating system for testing coal samples was developed,and a method of impact tendency testing for gas-containing coal was developed.Four impact tendency indexes of coal,which including the uniaxial compressive strength,dynamic failure time,impact energy index and elastic energy index,were measured under the gas pressure of 0,0.5,1.0,1.5,2.0 MPa.The test results show that the impact tendency of coal decreases as its internal gas pressure increases.Based on the comprehensive index evaluation method,considering the influence of gas on the rockburst hazard of coal seam,an improved comprehensive index evaluation method of rock hazard was proposed.In this method,the coal seam gas property was regarded as a kind of geological factor,and the gas drainage effect was regarded as a kind of mining technical condition.The improved comprehensive index evaluation method was used to evaluate the rockburst hazard of high gas coal seam in the second panel of a coal mine.It is found that the evaluation result of both geological conditions and mining technical conditions have a good consistency.