构造煤中有机显微组分变形差异的力学及分子结构本质  

Mechanical and molecular structure essence of deformation differences in organic macerals of tectonically deformed coal

作　　者：侯晨亮 姜波[2] 李明[2] 宋昱[2] 刘和武[1] 程国玺 HOU Chenliang;JIANG Bo;LI Ming;SONG Yu;LIU Hewu;CHENG Guoxi(State Key Laboratory of Digital and Intelligent Technology for Unmanned Coal Mining,Anhui University of Science and Technology,Huainan 232001,China;Key Laboratory of Coalbed Methane Resource&Reservoir Formation Process Ministry of Education,China University of Mining&Technology,Xuzhou 221008,China)

机构地区：[1]安徽理工大学煤炭无人化开采数智技术全国重点实验室,安徽淮南232001 [2]中国矿业大学煤层气资源与成藏过程教育部重点实验室,江苏徐州221008

出　　处：《煤炭学报》2025年第3期1633-1646,共14页Journal of China Coal Society

基　　金：安徽理工大学高层次引进人才科研启动基金资助项目(2023yjrc83);国家自然科学基金资助项目(42472224,41430317)。

摘　　要：煤体微观变形的非均质性对煤层气赋存、运移产出具有重要影响,其中有机显微组分变形差异是煤体微观变形的关键,当前对有机显微组分变形差异性与其力学性质及分子结构之间的内在联系研究仍相对薄弱。以构造煤中有机显微组分变形差异性特征研究为基础,借助原生结构煤的高温高压变形物理模拟试验验证原位温度-应力条件下有机显微组分的变形规律,结合有机显微组分的原位纳米力学参数和分子结构特征等测试结果,阐释了构造煤中有机显微组分变形差异的力学及分子结构本质。结果表明:壳质组的分子结构松散、稳定性低、可抵抗的应力最小,表现出的硬度和弹性模量也最小,相同温度、应力载荷作用下蠕变位移最大,构造应力作用下易发生韧性弯曲变形;镜质组的分子结构相对紧密、稳定性较高、可抵抗应力较大,其硬度和弹性模量较大,相同温度、应力载荷作用下蠕变位移较小,构造应力作用下多出现脆性破裂变形;相比而言,惰质组的分子结构最为紧密、稳定性最高、可抵抗应力最大,其硬度和弹性模量最大,等同温度、应力载荷作用下蠕变位移最小,相同构造应力作用下产生的脆性破裂变形要弱于镜质组。The heterogeneity of coal microdeformation has a significant impact on the occurrence and migration of coal-bed methane,and the difference in organic maceral deformation is the key to analyzing coal microdeformation.To date,there are few studies on the inner relationship between the deformation differences of organic macerals and their mechan-ical properties and molecular structure.Therefore,based on the study of the deformation differences among organic ma-cerals in tectonically deformed coal,this study verified the deformation law of organic macerals under the in-situ temperat-ure and stress through the physical simulation experiments involving high-temperature and high-pressure deformation of primary structure coal.Combined with the test results of in-situ nanomechanical parameters and molecular structure char-acteristics of each organic maceral,this study reveals the mechanical basis and molecular structure essence of the deforma-tion differences in organic macerals of tectonically deformed coal,as follows.Exinite has the lowest hardness,elastic modulus,and maximum creep displacement because its molecular structure is loose with low stability and the minimum stress resistance,thus,exinite tends to produce ductile bending deformation under tectonic stress.The molecular structure of vitrinite is relatively tight with higher stability and larger stress resistance,thus,vitrinite has higher hardness,elastic modulus,and smaller creep displacement,and easily appears to brittle fracture deformation under stress.In comparison,the molecular structure of inertinite is the most compact with the highest stability and maximum stress resistance,and in-ertinite shows the highest hardness,elastic modulus,and minimum creep displacement,so that inertinite has weaker brittle fracture deformation than vitrinite under the same tectonic stress.

关 键 词：构造煤 微观变形 有机显微组分 力学性质 分子结构 

分 类 号：TD311[矿业工程—矿井建设] TQ530[化学工程—煤化学工程] P618[天文地球—矿床学]