浅埋厚煤层开采地表导气裂缝分布规律研究

为了确定浅埋厚煤层开采地表漏风范围，基于串草圪旦煤矿6104工作面生产技术条件，采用现场实测、数值计算和理论分析相结合的方法，对浅埋厚煤层开采覆岩采动裂缝及导气裂缝的分布规律进行了研究。研究结果表明：浅埋厚煤层开采覆岩采动裂缝可分为开切眼侧永久裂缝区，以及随工作面推进动态分布的裂缝产生区、裂缝贯通发展区和裂缝闭合区；6104工作面裂缝贯通发展区范围为滞后工作面0～100 m。实测6104工作面导气裂缝分布区滞后工作面0～80 m，且导气能力随裂缝滞后工作面距离的增大而降低。

Study on Distribution Law of Gas Leakage Fissure in Shallow Thick Coal Seam Mining

In order to determine the surface air leakage range of shallow thick coal seam mining, based on the technical conditions of 6104 working face in Chuancao Gedan Coal Mine, the distribution law of overburden mining fracture and gas leakage fissure in shallow thick coal seam mining were studied by means of field measurement, numerical calculation and theoretical analysis. The results show that the overburden mining fractures in shallow and thick coal seam mining can be divided into permanent fracture zones on the side of workface starting line, as well as the fissure initiation zone, the fissure propagation zone and the fissure closure zone distributed dynamically with the working face mining; the fissure propagation zone in 6104 working face is 0 m to 100 m behind the working face. Field measurement shows that the gas leakage fissure zone in 6104 working face is 0 m to 80 m behind the workface, and the gas conductivity decreases with the increase of the distance from crack to working face.