高抽巷负压对采空区瓦斯涌出及自燃“三带”影响的数值模拟

发布时间：2018-04-02 21:45

本文选题：高抽负压　切入点：采空区　出处：《中国煤炭》2017年09期

【摘要】：将采空区看作多孔介质,利用渗流力学等理论推导出采空区渗透率及采空区渗流控制方程。利用数值模拟软件Fluent,以天池煤矿401工作面的相关基础参数模拟高抽负压对采空区瓦斯涌出和自燃"三带"影响规律。从模拟结果得出,抽采率随着高抽负压的增大而增加,但随着高抽负压的增大,抽采率增加幅度越来越小;高抽巷瓦斯浓度随着抽放负压升高而下降,但瓦斯抽放纯量是增加的。随着高抽负压的增加会使可能自燃"三带"宽度有所拉宽,但总体来说随着高抽负压的增大并没有使得采空区自燃"三带"与工作面的相对位置有明显的变化,为瓦斯抽放时火灾的防治提供理论依据。
[Abstract]:The goaf is regarded as a porous medium and the permeability and seepage governing equation of goaf are derived by using the theory of seepage mechanics.By using numerical simulation software Fluent. the influence of high negative pressure on gas emission and spontaneous combustion in goaf is simulated with the basic parameters of 401 face in Tianchi Coal Mine.The simulation results show that the extraction rate increases with the increase of the negative pressure of the high drainage, but with the increase of the negative pressure of the high drainage, the increase of the extraction rate is smaller and smaller, and the gas concentration of the high drainage roadway decreases with the increase of the negative pressure.But the scalar amount of gas drainage is increased.With the increase of high suction negative pressure, the width of "three zones" may be widened, but as a whole, with the increase of high suction negative pressure, there is no obvious change in the relative position between the "three zones" and the working face in the goaf spontaneous combustion.It provides theoretical basis for fire prevention and control during gas drainage.
【作者单位】：山西和顺天池能源有限责任公司;西安科技大学安全学院;
【基金】：国家自然科学基金(51604219) 中国博士后科学与基金项目(2016M602843)
【分类号】：TD712.5

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