高瓦斯综采工作面瓦斯涌出预测与立体防治技术研究

针对高瓦斯低渗透煤层工作面瓦斯抽采与灾害控制难题,以土城矿15311综采工作面为研究对象,首先,初步分析了工作面瓦斯涌出来源,运用分源预测法预测了其瓦斯涌出含量,接着针对性地在3#煤层运用了顺层钻孔、底抽巷穿层钻孔、高位钻场以及采空区埋管等多种抽采方法,并联合工作面配风提出了立体瓦斯防治技术。最后,通过施工底抽巷截留钻孔对底抽巷溢出瓦斯进行截留抽放,考察了抽采效果。结果表明:15311综采工作面瓦斯来源主要为3#煤层和下邻近层,瓦斯抽采总量为45.4 m3/min,瓦斯抽采率为85.33%,回风流中瓦斯浓度未超过1%,瓦斯抽采达标,有效地控制了工作面高瓦斯的涌出。

Research on the Prediction of Gas Emission and 3D Prevention and Control Technology for Fully-mechanized Face with High Gas

In the light of the problem of gas extraction and disaster control for coal mining face with high gas and low permeability, No.15311 fully-mechanized face of Tucheng Mine was considered as an object of study in this paper. Firstly, the source of gas emission was preliminarily analyzed, the different-source prediction method was applied to predict the gas emission. Secondly, several methods of gas extraction, such as in-seam boreholes in mining seam, boreholes through mining seam in bed plate tunnel, boreholes in the high level gateway, and the pipeline buried in the goaf, was used to put forward the 3D prevention and control technology for gas combining with the ventilation in coal mining face. Basic on it, the spillover gas was intercepted and pulled out by drilling construction in the roadway floor, and the effect of extraction is also investigated. The filed practice indicated that:the source of gas emission in No.15311 fully-mechanized face is mainly form the coal seam and the lower adjacent layer, total gas extraction is 45.4 m³/t, gas extraction rate is 85.33%, the concentration of gas has not exceeded 1% in return air, this effectively control coal mining face of gas emission source.