浅埋深综放工作面采空区自燃危险区域判定

Dangerous Region Judgment of Spontaneous Combustion in Goaf of Fully Mechanized Top Coal Caving Mining Face with Shallow Depth Seam

根据安家岭一号井工矿4106工作面的实际情况,采用现场实测与数值模拟相结合的方法对该浅埋深综放工作面采空区自燃危险区域进行了研究,以采空区松散煤体气流微循环非线性渗流模型、采空区松散煤体温度分布数学模型和采空区松散煤体内氧气迁移模型为基础,建立了基于FLUENT的采空区氧浓度分布三维数学模型,模拟结果与现场实测数据基本吻合,为准确划定浅埋深综放工作面采空区自燃危险区域提供了新的技术手段。最后,根据采空区自燃危险区域范围确定了上隅角预埋管灌注三相泡沫与下隅角预埋管注氮气交替实施的防灭火工艺,实施效果良好。

According to the actual conditions of No.4106 coal mining face in Anjialing No.1 Mine,a site measurement and numerical simulation combined method was applied to study the spontaneous dangerous zone in the goaf of the fully mechanized top coal caving mining face in the shallow depth seam.Based on the gas micro circulated nonlinear vadose model of the loose coal in goaf,the temperature distribution mathematical model of the loose coal in the goaf and the oxygen migration model of loose coal in the goaf,a 3D mathematical model of the oxygen concentration distribution in the goaf was established based on FLUENT.The simulation results and site measured data could be basically fitted and could provide the new technical means to accurately delimit the spontaneous combustion dangerous zone in the goaf of the fully mechanized top coal caving mining face in the shallow depth seam.Finally,according to the spontaneous combustion zone scope in the goaf,a fire prevention and control technology was conducted with the pre-buried pipe and grouted three phase foam at the top corner and the pre-buried pipe nitrogen injection alternatively.Thus the spontaneous combustion of the loose coal in the goaf of the coal mining face was effectively prevented and controlled and the safety mining of the coal mining face was protected.