切顶卸压无煤柱自成巷开采技术简称110工法，其通风模式为Y型通风，漏风隐患严重，增大了煤自燃危险性，对煤矿井下正常生产造成了一定威胁。因此，本论文基于实验研究、数值计算及现场测试相结合的方法，对龙凤煤矿遗煤氧化过程微观结构、气体生成、热效应和动力学机理变化规律进行了研究，并分析了1905工作面采空区漏风流场，划分其煤自燃三带分布范围，对切顶卸压条件下工作面采空区煤氧化特性研究和漏风治理提供了理论依据。

基于工业分析和元素分析实验，研究了龙凤煤矿9煤煤质和元素组成；采用原位傅里叶变换红外光谱实验，研究了9煤氧化过程微观结构演化特性，得到含氧官能团在煤中基团中含量占比最大，并随氧气浓度的增加而降低，羟基、甲基、亚甲基和C=O结构含量随温度和氧气浓度的升高先增大后降低，同时红外结构参数表明，9煤脂肪链长度随氧气浓度的升高先降低后增加，芳香度和芳碳率分别受芳环缩合作用和芳香体系的影响而增大；利用程序升温实验，研究了9煤氧化过程气体产物及各特征参数变化，得到其耗氧速率、CO生成速率和放热强度随温度和氧气浓度的升高而增大，最小浮煤厚度和下限氧气浓度随氧气浓度的降低而增大，随温度的升高而先增加后减小，而上限漏风强度的表现则相反；基于同步热分析实验，研究了9煤氧化过程热效应变化，得到了特征温度、放热峰值及放热量等参数在不同升温速率和氧气浓度下的变化规律，并采用Coats-Redfern方法对其受热分解/燃烧阶段进行动力学分析，得到该阶段的最概然机理函数符合n=4的A-E方程，其活化能随升温速率的增大而减小，随氧气浓度的增大而增加；基于Pearson相关系数法研究了9煤氧化过程特性参数与微观结构间的相关性，得到对耗氧速率和放热强度影响最大的活性基团分别为OH-N氢键和单取代芳烃，而随着温度的升高，对特征温度影响最大的活性基团逐渐从芳香烃过渡到羟基。

基于COMSOL数值模拟研究了不同通风量、留巷长度下工作面采空区漏风流场、氧气浓度场的分布规律，并结合束管监测，得到沿工作面倾向方向194～205 m范围漏风最为严重，其向采空区的漏风量占倾向方向漏风总量的70%以上；而当留巷长度达到300 m后，工作面走向方向向沿空留巷漏风最为严重的区域则稳定在41～160 m范围。当留巷长度达到200 m后，沿空留巷侧氧化升温带宽度约为44～46 m，运顺侧宽度约为120～123 m。

The technology of roof cutting and pressure relief without coal pillar self-forming roadway mining is referred to as 110 method. Its ventilation mode is Y-type ventilation, and the hidden danger of air leakage is serious, which increases the risk of coal spontaneous combustion and poses a certain threat to the normal production of coal mine. Therefore, based on the combination of experimental research, numerical calculation and field test, this paper studies the microstructure, gas generation, thermal effect and dynamic mechanism of the residual coal oxidation process in Longfeng Coal Mine, and analyzes the goaf of 1905 working face. The air leakage flow field divides the distribution range of the three zones of coal spontaneous combustion, and provides a theoretical basis for the study of coal oxidation characteristics and air leakage control in the goaf of the working face under the condition of roof cutting and pressure relief.

Based on industrial analysis and elemental analysis experiments, the coal quality and elemental composition of 9 coal in Longfeng Coal Mine were studied. The in-situ Fourier transform infrared spectroscopy experiment was used to study the microstructure evolution characteristics of 9 coal oxidation process. It was found that the content of oxygen-containing functional groups in coal was the largest, and decreased with the increase of oxygen concentration. The content of hydroxyl, methyl, methylene and C = O structure increased first and then decreased with the increase of temperature and oxygen concentration. At the same time, the infrared structure parameters showed that the length of 9 coal aliphatic chain decreased first and then increased with the increase of oxygen concentration, and the aromaticity and aromatic carbon rate were affected by aromatic ring condensation and aromatic system, respectively. The changes of gas products and characteristic parameters in the oxidation process of 9 coal were studied by temperature programmed experiment. The oxygen consumption rate, CO formation rate and heat release intensity increased with the increase of temperature and oxygen concentration. The minimum floating coal thickness and the lower limit oxygen concentration increased with the decrease of oxygen concentration, and increased first and then decreased with the increase of temperature, while the upper limit air leakage intensity was opposite. Based on the simultaneous thermal analysis experiment, the change of thermal effect in the oxidation process of 9 coal was studied, and the variation rules of characteristic temperature, exothermic peak and heat release under different heating rates and oxygen concentrations were obtained. The Coats-Redfern method was used to analyze the kinetics of its thermal decomposition / combustion stage. The most probable mechanism function of this stage conforms to the A-E equation of n = 4, and its activation energy decreases with the increase of heating rate and increases with the increase of oxygen concentration. Based on the Pearson correlation coefficient method, the correlation between the characteristic parameters and the microstructure of the 9 coal oxidation process was studied. The active groups that had the greatest influence on the oxygen consumption rate and the heat release intensity were OH-N hydrogen bonds and monosubstituted aromatic hydrocarbons, respectively. With the increase of temperature, the active groups that had the greatest influence on the characteristic temperature gradually transitioned from aromatic hydrocarbons to hydroxyl groups.

Based on COMSOL numerical simulation, the distribution law of air leakage flow field and oxygen concentration field in goaf of working face under different ventilation volume and length of retaining roadway is studied. Combined with beam tube monitoring, it is found that the air leakage is the most serious in the range of 194 ~ 205 m along the tendency direction of working face, and the air leakage to goaf accounts for more than 70 % of the total air leakage in the tendency direction. When the length of the retaining roadway reaches 300 m, the area with the most serious air leakage in the direction of the working face is stable in the range of 41 ~ 160 m. When the length of the retaining roadway reaches 200 m, the width of the oxidation heating zone on the side of the gob-side retaining roadway is about 44 ~ 46 m, and the width of the transport side is about 120 ~ 123 m.

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