本文選題：結(jié)構(gòu)缺陷 + 自由基濃度　； 參考：《太原理工大學(xué)》2016年碩士論文

【摘要】：煤是一種復(fù)雜的大分子有機(jī)巖石,對周圍環(huán)境的應(yīng)力十分敏感。煤受到構(gòu)造應(yīng)力作用,形成了不同變形特征的構(gòu)造煤。構(gòu)造煤的宏觀變形特征與分子結(jié)構(gòu)的演化與原生結(jié)構(gòu)煤都不相同。宏觀變形上,從脆性變形煤到韌性變形煤,原生結(jié)構(gòu)的保存程度越來越差,粒度也越來越小,手拭強(qiáng)度也越來越小,宏觀煤巖組分也越來越難以辨認(rèn)。構(gòu)造煤結(jié)構(gòu)上原生層理結(jié)構(gòu)慢慢變差,逐漸表現(xiàn)出擦痕、階步,鱗片狀和揉皺狀的結(jié)構(gòu)。與原生結(jié)構(gòu)煤相比,碎裂煤發(fā)育著有利煤層氣擴(kuò)散和滲流的較大的裂隙結(jié)構(gòu),而碎粒煤和糜棱煤因破碎變形嚴(yán)重而無法觀察到裂隙發(fā)育狀況。在變質(zhì)變形過程中,構(gòu)造煤的分子結(jié)構(gòu)演化具有一定的規(guī)律性。利用拉曼光譜、電子順磁共振波譜和紅外光譜對構(gòu)造煤的分子結(jié)構(gòu)演化特征進(jìn)行分析。構(gòu)造煤的拉曼光譜分析,可以定性地表征次生結(jié)構(gòu)缺陷變化規(guī)律。隨著構(gòu)造煤R_(o,max)的增大,構(gòu)造煤分子的結(jié)構(gòu)缺陷發(fā)生規(guī)律變化。脆性變形煤D峰面積逐漸增加,碎裂煤D峰面積增加幅度大于碎粒煤,韌性變形煤的D峰面積逐漸減小。在脆性變形機(jī)制下,G峰面積隨構(gòu)造煤R_(o,max)的變大而迅速升高,碎裂煤的增長速度較大。韌性變形煤的G峰面積增長緩慢。造成這種現(xiàn)象的原因可能是構(gòu)造應(yīng)力對煤的分子結(jié)構(gòu)的降解和縮聚作用。通過對構(gòu)造煤的電子順磁共振波譜分析發(fā)現(xiàn),不同類型構(gòu)造煤的演化規(guī)律具有差異。碎裂煤自由基濃度隨變質(zhì)程度升高而降低;碎粒煤表現(xiàn)為先降低后升高;糜棱煤的自由基濃度表現(xiàn)為N型演化特征。通過對構(gòu)造煤紅外光譜分析發(fā)現(xiàn),隨變質(zhì)變形作用的增強(qiáng),構(gòu)造煤的芳香結(jié)構(gòu)的Ⅲ類氫原子含量增加,而Ⅳ類氫原子含量減少,芳香環(huán)縮合程度提高,而脂肪結(jié)構(gòu)和含氧官能團(tuán)含量減少。利用波譜學(xué)原理對構(gòu)造煤分子結(jié)構(gòu)分析,發(fā)現(xiàn)在構(gòu)造應(yīng)力作用下,構(gòu)造煤分子結(jié)構(gòu)具有明顯的演化規(guī)律。
[Abstract]:Coal is a kind of complex macromolecular organic rock, which is sensitive to the stress of surrounding environment. Coal is subjected to tectonic stress, forming tectonic coal with different deformation characteristics. The macroscopic deformation characteristics and the evolution of molecular structure of tectonic coal are different from that of primary coal. In macroscopic deformation, from brittle deformed coal to ductile deformed coal, the preservation degree of primary structure is getting worse and worse, the particle size is becoming smaller and smaller, the hand wiping strength is becoming smaller and smaller, and the macroscopic coal and rock components are becoming more and more difficult to identify. The primary bedding structure in the structural coal structure gradually becomes worse, and gradually shows the structure of scratch, step, scale and crinkle. Compared with the primary coal, the fractured coal has a large fracture structure which is favorable to the coalbed methane diffusion and percolation, while the broken coal and the minced coal can not be observed because of the serious crushing deformation. In the course of metamorphic deformation, the evolution of molecular structure of tectonic coal has certain regularity. The molecular structure evolution characteristics of tectonic coal were analyzed by Raman spectrum, electron paramagnetic resonance spectroscopy and infrared spectrum. Raman spectroscopy analysis of tectonic coal can characterize the variation of secondary structural defects qualitatively. With the increase of tectonic coal, the structural defects of structural coal molecules change. The D peak area of brittle deformed coal increases gradually, and the D peak area of broken coal is larger than that of granular coal, while the D peak area of ductile deformed coal decreases gradually. Under the brittle deformation mechanism, the area of G peak increases rapidly with the increase of the tectonic coal R _ S _ O _ (max), and the growth rate of the fractured coal is larger. The G peak area of ductile deformed coal increases slowly. The reason for this phenomenon may be the degradation and condensation of the molecular structure of coal by tectonic stress. Through the electron paramagnetic resonance spectroscopy analysis of tectonic coal, it is found that the evolution law of different types of tectonic coal is different. The free radical concentration of broken coal decreased with the increase of metamorphic degree, that of pulverized coal decreased first and then increased, and the free radical concentration of minced coal showed the characteristics of N-type evolution. The infrared spectrum analysis of structural coal shows that with the increase of metamorphic deformation, the 鈪，

本文編號：1857825