普采工作面长度及动态压差对采空区自燃氧化带影响研究

The Conventional Working Face Length and Dynamic Differential Impact Study of the Goaf Spontaneous Combustion Oxidation Zone

为了研究工作面长度及动态压差与采空区自燃氧化带分布的关系,在GAMBIT上,建立了工作面长度分别为60 m和90 m的采空区物理模型;利用FLUENT软件,计算了6个不同工作面压差下的采空区渗流流动,得到12个工况下的渗流流场。结果表明:沿工作面长度方向,自燃氧化带上限风速、下限风速和中值风速的等值线,呈现为"鱼背"型曲线;随着工作面压差增大,自燃氧化带上限风速的"鱼背"型曲线向采空区深部移动,且该带范围略微变宽;随着工作面长度增加,自燃氧化带上限风速"鱼背"型曲线向采空区深部移动,且该带范围显著变宽。研究结果对防治采空区煤炭自燃有指导作用。

In order to research the relation between a goaf OSC（ oxidization and spontaneous combustion） zone and mining face length,dynamic pressure difference,the physical goaf models of 60 m and 90 m length mining faces are constructed by GAMBIT. 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 results are shown that： along the mining face length,contoured velocity lines of the maximum,minimum and mid-value for OSC zone appear ＂ fishback＂ curves; as the increase of mining face pressure difference,the maximum velocity ＂ fishback＂ curve moves to the deeper goaf,and the width of OSC zone becomes appreciably larger; as the increase of mining face length,the maximum velocity ＂ fishback＂ curve moves to the deeper goaf,and the width of OSC zone becomes markedly larger. The conclusions could guide to control spontaneous combustion of remaining coal in a goaf.