表土厚度对浅埋工作面采空区自燃的影响规律

发布时间：2018-03-05 00:04

本文选题：安全工程　切入点：浅埋煤层　出处：《安全与环境学报》2017年02期 　论文类型：期刊论文

【摘要】：鄂尔多斯地区的煤层埋藏浅,表土层厚度对地表漏风影响明显,继而导致采空区的自燃危险区域发生变化。为此以某煤矿4201工作面为研究对象,先通过二维离散单元程序UDEC模拟确定地表与采空区连通时的表土层厚度范围,再根据该模拟结果建立不同表土层厚度条件下的采空区漏风模型,用Fluent数值模拟软件对采空区自燃危险区域进行模拟。结果表明:当采空区上覆基岩厚度一定、表土厚度小于74 m时,煤层开采后地表裂隙会与采空区连通,从而导致地表漏风;表土层厚度越小,采空区自燃危险区域的范围和地表漏风量就越大,两者近似呈对数函数关系;地表漏风不但使采空区自燃危险区域的范围明显增大,而且使回风侧宽度大于进风侧宽度。
[Abstract]:The coal bed in Ordos area is shallow, and the thickness of the surface soil layer has obvious influence on the surface air leakage, which leads to the change of the spontaneous combustion dangerous area in the goaf. Therefore, the 4201 face of a coal mine is taken as the research object. Firstly, the thickness range of the surface soil layer when the surface is connected with the goaf is determined by the two-dimensional discrete element program UDEC, and then the air leakage model of the goaf under the condition of different thickness of the surface soil layer is established according to the simulation results. The Fluent numerical simulation software is used to simulate the dangerous area of spontaneous combustion in goaf. The results show that when the thickness of overlying bedrock is constant and the thickness of surface soil is less than 74 m, the surface fissure will be connected with the goaf after coal seam mining, which will lead to surface air leakage. The smaller the thickness of topsoil layer, the greater the range of spontaneous combustion danger area and the surface air leakage in goaf, and the relationship between them is approximately logarithmic, and surface air leakage not only increases the range of spontaneous combustion danger area in goaf, Moreover, the width of the return wind side is larger than that of the inlet side.
【作者单位】：辽宁工程技术大学安全科学与工程学院;辽宁工程技术大学矿业技术学院安全工程系;
【基金】：国家科技支撑计划项目(2013BAK06B00) 国家自然科学基金青年基金项目(51404127)
【分类号】：TD752.2

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