工作面临界压力梯度与采空区自燃氧化带宽度研究

?为了研究采空区自燃氧化带与工作面通风压差的关系，建立了工作面长度分别为60，90 m的采空区物理模型；利用FLUENT计算了6个不同工作面压差下的采空区渗流流动，得到共计12个工况下的渗流流场。数值计算结果表明:随着工作面压差增大，自燃氧化带向采空区深部移动，且该带范围变宽；随着工作面长度增加，自燃氧化带向采空区深部移动，且该带范围变宽；长度为60，90 m的工作面，临界工作面压差分别为25，35 Pa，得到了沿工作面长度方面的临界压力梯度约0.400 0 Pa/m。工作面临界压力梯度可作为工作面通风设计及采空区煤炭自燃防治的参考依据。

Study on critical pressure gradient and width of spontaneous combustion zone of goaf on working face

?To research the relationship between a goaf OSC（oxidization and spontaneous combustion）zone and pressure difference of mining face ventilation，the physical goaf models of 60 m and 90 m length mining face were constructed. By FLUENT software，the seepage flow in a goaf was calculated on the 6 conditions of mining face pressure difference，and it is obtained 12 seepage flow fields. The numerical results are shown that:a.as the increase of pressure difference，the OSC zone moves to the deeper goaf；b.as the increase of mining face length，this zone also moves to the deeper goaf；c.as far as 60 m and 90 m mining faces，the critical pressure differences are 25 Pa and 35 Pa，respectively，and the critical pressure grandient is approximately 0.400 0 Pa/m. This critical value could be referred to mining face ventilation design and control spontaneous combustion of remaining coal in a goaf.