突出煤层煤平巷落煤后下帮卸压范围分析

Analysis on Pressure Released Scope of Low Side Wall After Coal Blasting Operation of Seam Gateway in Outburst Seam

为了保证突出煤层掘采工作的安全，用钻屑瓦斯解吸指标法确定了煤平巷落煤后下帮的瓦斯卸压影响范围，通过测定K，值，△h2值等可以判定黄牛岭矿井围岩应力三带分布范围的特点，现场考察分析了煤厚2m、倾角30～40。的突出煤层煤平巷落煤后煤下帮的K，和△h2测值分布规律。结果表明：在考察区域对应的瓦斯地质和采矿环境下，突出煤层煤平巷落煤后下帮卸压影响范围为7～9m，卸压范围为0～6m。

In order to ensure guide the safety excavation and mining operation in outburst seam, the gas desorption index method of the drilling cuttings was applied to determine the gas pressure released influence scope in the low side wall of the gateway after the coal blas- ting operation of the seam gateway. With the measurement of K2 value and △h2 value, the features of the stress distribution scope in the three zones of the surrounding rock in Huangniuling Mine could be determined. The site investigation and analysis was conducted on the distribution law of measured values K1 and △h2 in the low side wall of the gateway after the coal blasting operation of the seam gateway in the outburst seam with the thickness of 2 m and an inclination of 30 -40°. The results showed that under the related gas geology and the mining environment in the investigated area, the pressure released influence scope in the low side wall of the seam gateway after the coal blasting operation in the outburst seam gateway would be 7 -9 m and the pressure released scope would be 0 -6 m.