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为了探讨不同的变形机制对无烟煤化学结构的影响,从而深入研究构造煤的化学结构的改变与瓦斯突出之间的相互关系,本文采用沁水盆地南部晋城矿区的无烟煤进行了10组次高温高压实验,并且对实验前后样品进行了傅里叶变换红外光谱(FTIR)、激光拉曼光谱(Raman)和镜质组反射率(VR)的测试和分析.结果表明,除温度对煤化学结构影响较为明显外,应变速率对煤的化学结构也有明显影响.在较高应变速率(4×10~(-5) s~(-1))下,煤主要表现为脆性变形,样品发育具有明显位移的主破裂面,煤化学结构总体变化规律不明显;随着应变速率的降低,韧性变形作用渐趋增强,应变能不断积累,导致煤大分子结构发生晶内位错、滑移,缩合芳环数量和次生结构缺陷数量亦随之增加,脂族和醚键氧等官能团相继裂解析出,形成分子量更低的小分子,产生CO气体.此外,变形实验后样品的Ro,max值均明显大于变形前样品,暗示构造变形作用促进了煤的变质作用,同时镜质组反射率椭球(VRI)是反映构造变形作用类型的有效指标.
In order to explore the influence of different deformation mechanisms on the chemical structure of anthracite, so as to further study the relationship between the change of chemical structure of the structural coal and gas outburst, 10 sets of high temperature and high pressure experiments were conducted using anthracite in Jincheng mining area in southern Qinshui Basin (FTIR), Raman and vitrinite reflectance (VR) were measured and analyzed before and after the experiment.The results show that except for the influence of temperature on the chemical structure of coal Obviously, the strain rate also has a significant effect on the chemical structure of the coal. At higher strain rates (4 × 10 -5 s -1), the coal mainly shows brittle deformation and the samples have obvious displacement With the decrease of strain rate, the ductile deformation gradually increases and the strain energy accumulates continuously, resulting in dislocation, slippage and condensed aromatic ring number in the macromolecular structure of coal And the number of secondary structural defects also increased, the functional groups such as aliphatic and ether bond oxygen were successively cracked and separated to form lower molecular weight molecules to generate CO gas.In addition, Ro, max values of samples after deformation experiment Deformation substantially greater than the previous sample, suggesting the structural deformation promoting coal metamorphism, while vitrinite reflectance ellipsoids (VRI) is configured to reflect a valid indicator of the type of deformation.