特厚易自燃煤层综放工作面采空区自燃“三带”分布规律研究

发布时间：2018-03-30 22:33

本文选题：特厚易自燃煤层　切入点：采空区　出处：《安徽建筑大学》2013年硕士论文

【摘要】：特厚煤层(厚度8m)放顶煤开采过程中,采空区遗煤多,煤自燃火源隐蔽,位置和程度难以判定,加大了矿井火灾防治的难度。开展特厚煤层放顶煤开采条件下采空区煤氧化自燃规律研究,对保证矿井的安全生产、减少资源和财产损失具有十分重要的现实意义。目前国内外常采用自燃“三带”判定采空区危险区域范围,研究主要集中在厚度8m易自燃煤层的二维平而分布规律,关于特厚煤层采空区氧化自燃带三维空间分布规律的研究较少。为了更高效的防治矿井火灾,判定特厚易自燃煤层采空区空间自然发火危险区域显得尤为重要。本文通过理论分析、实验分析、数值模拟和现场实测等研究方法,以山西峁底矿13204易自燃煤层综放面(煤层平均厚度12.06m)为例,对特厚易自燃煤层综放工作面采空区的空间自燃“三带”分布规律及自燃防治进行了研究。首先,基于采空区气体的渗流理论,分析了采空区裂隙形成机理及遗煤的空间分布规律,确定了采空区的孔隙率分布函数。然后,通过UDF接口对ANSYS FLUENT软件进行二次开发,建立了采空区自然发火的三维模型,模拟分析13204综放面采空区的漏风速度场和氧浓度场,对采空区三维空间的自燃“三带”进行了划分,分析了漏风源位置和充填垛对自燃“三带”分布的影响。结果表明：1)在正常条件下,沿工作面倾向方向上,采空区氧化自燃带最宽处出现在采空区进风侧底板附近,可达到68m,回风侧次之,采空氧化自燃带在底板附近二维平面上呈现出一个进、回风侧向采空区深部扩张的类似“香蕉”状区域；在垂直高度上,采空区氧化自燃带随着高度的增加逐渐变窄,且其分布范围在逐渐向工作面靠拢。2)工作面进、回风端口砌筑充填垛后,氧化自燃带最宽处出现在采空区中部底板附近,仅有31m,采空区氧化带在底板附近呈“椭圆”状。3)漏风源在采空区顶板不同位置的氧化自然带宽度：进风侧(117m)回风侧(113m)采空中部(87m),即漏风源在进风侧时对采空区自燃防治最不利。最后,针对13204综放面煤层埋藏浅的实际情况,通过能位测定判断了可能存在的地面漏风通道,提出并实施了砌筑充填垛、压注MEA阻化液、加快推进度等针对性的防灭火措施,有效控制了采空区煤自燃,实现了工作面的安全高效生产。本文有望为特厚易自燃煤层综放面采空区防灭火提供了理论和实践借鉴作用。
[Abstract]:In the process of coal mining with extra thick coal seam ( thickness of 8 m ) , it is difficult to determine the location and extent of coal spontaneous combustion in coal mining area . It is of great practical significance to study the coal oxidation spontaneous combustion in mining area under the condition of top coal mining under special thick coal seam .

Based on the theoretical analysis , experimental analysis , numerical simulation and field measurement , the paper studies the spatial self - ignition " three - zone " distribution law and spontaneous combustion control of the gob area in the fully mechanized top coal caving face of the special - thick spontaneous combustion coal seam . First , based on the seepage theory of gas in mined area , the mechanism of fracture formation in gob area and the spatial distribution of coal are analyzed , and the porosity distribution function of mined area is determined .

The three - dimensional model of natural fire in mined - out area is established through UDF interface , and the three - dimensional model of natural fire in gob area is established . The influence of air leakage source position and filling stack on self - ignition ' three - belt ' distribution is analyzed .
in that vertical height , the oxidized spontaneous combustion zone of the goaf gradually becomes narrow as the height increase , and the distribution range of the oxidized self - ignition belt is gradually close to the working face .

Finally , aiming at the actual situation of shallow coal seam buried in 13204 fully mechanized caving face , the possible existence of ground water leakage channel is judged through the position determination , and the targeted fire - fighting measures such as building filling , pressing MEA resistance liquid and accelerating the propulsion degree are put forward , so that the coal spontaneous combustion in the goaf is effectively controlled , and the safe and efficient production of the working face is realized .

【学位授予单位】：安徽建筑大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TD752.2

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