基于多指标法测定煤巷帮部瓦斯预排带宽度

Measurement of Gas Pre-releasing Width in Coal Roadway Based on Multi-index Method

针对梁北煤矿11131孤岛工作面采用沿空掘巷时,沿空煤体的力学环境复杂、瓦斯排放效果不清楚等问题,采用数值模拟、瓦斯参数、电磁辐射等指标综合评价了沿空煤体的力学特性及瓦斯参数分布规律。结果表明:钻屑量、钻孔瓦斯含量及钻孔解吸指标可反映巷帮不同深度瓦斯变化规律,电磁辐射可以反映巷帮不同深度应力变化规律,综合确定11131机巷瓦斯预排带从采空区一侧起,范围大于25 m,从实体煤一侧起,预排带宽度大于15 m;11131风巷瓦斯排放结果与机巷类似。

In terms of 11131 island mining face in Liangbei mine, due to complex mecnanlcat environment along the coal mass and unclear gas releasing effects, gas parameters and electromagnetic radiation index were used to evaluate the mechanical characteristics and gas distribution law about coal along with gob during roadway extraction. The results showed that the amount of cuttings, the gas content of boreholes and the gas resorption indicators could reflect the gas changes with depth of borehole, and the electromagnetic radiation could reflect the stress variation rules of coal mass along roadway in different depth. Eventually, it was determined gas pre-releasing width of 11131 machinery tunnel exceeded 25 m from gob side, and 15 m from coal mass, which was similar to that of air roadway.