综放采场煤炭自燃三维数值模型构建及应用研究

发布时间：2018-03-04 01:33

本文选题：综放采场　切入点：煤炭自燃三维数值模型　出处：《辽宁工程技术大学》2013年博士论文　论文类型：学位论文

【摘要】：随着综放开采方法的广泛应用,综放采场煤炭自燃已经成为矿井的主要灾害之一,严重影响安全高效矿井的建设。数值模拟分析是对其进行研究的主要方法之一因此,本文在对综放采场煤炭自燃特性分析的基础上,开展综放采场煤炭自燃三维数值模型构建的研究,并利用模型对综放采场煤炭自燃规律及防治措施进行研究。基于遗煤厚度与冒落煤岩空隙率对综放采空区煤炭自燃影响的重要性,采用理论分析方法对遗煤厚度、冒落煤岩空隙率进行了研究,得到了依据顶板压力与碎胀系数确定遗煤厚度及冒落煤岩空隙率的方法；并对受压遗煤进行了实验研究,得到了遗煤厚度对煤炭自燃的影响规律。由于综放采场极限平衡区顶煤也易发生自燃,应用回归分析方法、损伤力学理论及实验方法,对综放采场极限平衡区宽度及顶煤渗透率进行了研究,得到了极限平衡区宽度的确定方法及计算顶煤渗透率的经验公式。通过对综放采场煤炭自燃的渗流场、浓度场、温度场的特点分析,构建了综放采场煤炭自燃三维数值模型,并对具体条件下极限平衡区及采空区的煤炭自燃进行了模拟,通过对现场观测数据与数值模拟结果的对比分析,证明了所构建综放采场煤炭自燃三维模型的正确性及模拟结果的可靠性。利用所建数值模型对综放极限平衡区及采空区煤炭自燃规律进行了分析,得到了工作面供风量与顶煤升温时间及高温点位置、与采空区氧化带高度及宽度、与采空区高温点位置及遗煤升温时间的关系；耗氧速度与自然发火期的关系；综放采空区“三带”划分及温度场分布的特点。依据构建数值模型对九道岭矿E1S6综放面采空区煤炭自燃特点进行了分析,提出了具有针对性的注氮防治措施,并对其有效性进行了数值模拟分析。分析结果表明,该措施能够发挥采场煤炭自燃控制作用。最后,将防治措施在九道岭矿进行了实际应用,并取得了较好的防治效果,证明了所构建综放采场煤炭自燃数值模型的实用性。
[Abstract]:With the wide application of fully mechanized caving mining method, spontaneous combustion of coal in fully mechanized caving stope has become one of the main disasters in coal mine, which seriously affects the construction of safe and efficient mine. Numerical simulation analysis is one of the main methods to study it. Based on the analysis of spontaneous combustion characteristics of coal in fully mechanized caving stope, this paper studies the construction of 3D numerical model of spontaneous combustion of coal in fully mechanized caving stope, and makes use of the model to study the law of spontaneous combustion of coal in fully mechanized caving stope and its prevention measures. Based on the importance of the influence of residual coal thickness and caving coal porosity on spontaneous combustion of coal in fully mechanized caving mining area, the thickness of residual coal and the porosity of caving coal are studied by theoretical analysis method. The method of determining the thickness of coal and the porosity of caving coal is obtained according to the roof pressure and the coefficient of dilatation, and the influence of the thickness of residual coal on the spontaneous combustion of coal is studied experimentally. Due to the spontaneous combustion of top coal in limit equilibrium area of fully mechanized caving stope, the width of limit equilibrium zone and the permeability of top coal in fully mechanized caving face are studied by means of regression analysis, damage mechanics theory and experimental method. The method for determining the width of the limit equilibrium zone and the empirical formula for calculating the permeability of top coal are obtained. By analyzing the characteristics of seepage field, concentration field and temperature field of coal spontaneous combustion in fully mechanized caving stope, a three-dimensional numerical model of coal spontaneous combustion in fully mechanized caving stope is constructed, and the coal spontaneous combustion in limit equilibrium area and goaf under specific conditions is simulated. Through the comparison and analysis of field observation data and numerical simulation results, it is proved that the 3D model of coal spontaneous combustion in fully mechanized caving stope is correct and reliable. By using the established numerical model, the coal spontaneous combustion law in the limit equilibrium zone and goaf of fully mechanized caving face is analyzed, and the air supply quantity in the face, the temperature rise time of the top coal and the position of the high temperature point, the height and width of the oxidation zone in the goaf are obtained. The relationship between oxygen consumption velocity and spontaneous combustion period, the division of "three zones" and the distribution of temperature field in fully mechanized caving caving area. Based on the construction of numerical model, the characteristics of coal spontaneous combustion in the goaf of E1S6 fully mechanized caving face of Jiudaoling Coal Mine are analyzed, and the corresponding measures of preventing and controlling nitrogen injection are put forward, and the effectiveness of these measures is analyzed numerically. The results show that, This measure can play a role in controlling spontaneous combustion of coal in stope. Finally, the control measures are applied in Jiudaoling Coal Mine, and good control effect is obtained, which proves the practicability of the numerical model of spontaneous combustion of coal in fully mechanized caving stope.
【学位授予单位】：辽宁工程技术大学
【学位级别】：博士
【学位授予年份】：2013
【分类号】：TD752.2

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