综采长壁工作面推进速度对优势瓦斯通道的诱导与控制作用

Guidance and control effect of drawing speed on excellent gas channel at fully mechanized longwall face

基于采动裂隙椭抛带理论,确定了采动优势瓦斯通道带的上、下边界,构建了采动优势瓦斯通道带的时空形态理论模型。以淮北祁南矿34下采区为原型,开展了上覆岩采动瓦斯通道扩展数值仿真研究,发现优势瓦斯通道在上覆岩的空间位置随推进速度的增加而降低,发育高度、宽度和范围随推进速度的增加而减小等特征。以此为依据,对综采工作面推进速度加快后的高位钻孔参数进行了相应调整,并在祁南矿34下2工作面开展了卸压瓦斯抽采人工导流试验,现场试验结果验证了高位钻孔参数依据推进速度而进行的优化是合理的,从而也验证了本文提出的推进速度对优势瓦斯通道的诱导与控制规律是正确的。

Based on the elliptic paraboloid zone theory of mining fissure,a theoretical model was established,which means that the temporal and spatial form of excellent mining gas channel was corresponding to the advancing distance of working face,and the upper and lower boundary of excellent gas channel was determined in this study. Based on the geological conditions of Qinan Coal Mine of Huaibei,this study investigated the expanding rule of mining gas channel by UDEC as well as the control action of the channel acting on the pressure relief flow under the condition of coal seam group using field test. The numerical calculations show that the typical location,height and width of excellent mining gas channel are lower with the higher drawing speed. According to the numerical calculations,the design parameters of high drilling was optimized with the higher drawing speed for the field test in 34low2 working face,which verifies the feasibility of parameters optimization for high drilling,and also confirms the guidance and control effect of drawing speed on excellent gas channel proposed in this study.