防冲钻孔参数确定的能量耗散指数法

钻孔布置参数的确定是大直径钻孔卸压防治冲击地压的关键之一。通过岩石力学试验、理论分析、现场实测等方法研究了工作面冲击危险区的卸压指标，提出了能量耗散指数的概念，推导出能量耗散指数与冲击能量指数之间的转换公式，得到以下结论：验证了能量耗散与冲击能量指数之间具有较好的相关性，可以将其作为煤层卸压后残余冲击危险性的评价指标；提出了工作面冲击危险区“分区分级”的防治理念，并以煤层有效卸压应变率分别为1.5‰、1.0‰、0.8‰作为新巨龙矿井高度、中度和一般冲击危险区的卸压标准；推导出了基于能量耗散指数的防冲钻孔参数定量计算方法，并在新巨龙矿井2302S工作面进行应用，取得了良好效果。研究结果对冲击地压防治具有参考意义。

Energy dissipation index method for determining rockburst prevention drilling parameters

Proper determination of drilling parameters plays a key role in applying big diameter drilling to prevent rockburst. The pressure relief evaluation index of burst risk area in coal face is studied based on rock mechanics testing, theoretical analysis and site measurement. The concept of energy dissipation index is presented, and the conversion formulation of energy dissipation index and bursting energy index is derived. Some conclusions are drawn as follows: good correlation is found between energy dissipation index and bursting energy index, which can be used as the index to evaluate the seam residual rockburst hazard of pressure relief. The “regionalization and grading” prevention and treatment ideas of rockburst risk area in coal face is proposed, with effective pressure relief strain rates of 1.5‰, 1.0‰ and 0.8‰ for the pressure relief indices of high, middle and general risk areas, respectively, in Xinjulong Mine. The quantitative calculation method of rockburst prevention relief drilling parameters is derived based on energy dissipation index. The ideas are applied to working face 2302S of Xinjulong Mine with a good result, providing a reference for rockburst control.