煤体脆—韧性变形微观识别标志

基金项目:

河南省自然科学基金资助项目(0211060800)

国家重点基础研究发展规划项目(2002CB211705)

详细信息

The microscopic identification of coal brittle-ductile deformation

摘要: 以煤体的光学显微镜和扫描电镜观测为主,结合手标本和井下宏观观测,以华北西部部分矿区的主要煤层为研究对象,研究了煤体的脆-韧性变形标志,发现煤体在构造应力的作用下先后经历了脆性、脆—韧性和韧性变形阶段。脆性变形阶段以煤体破裂为主要特征,初期以格里菲斯裂隙为主,后期以剪性裂隙为主,偶尔见张性裂隙。处于脆-韧性变形阶段的煤体脆性和韧性变形的标志共存。典型韧性变形主要集中在糜棱煤中。岩石中发现的韧性变形标志在煤体中,除了重结晶现象,几乎都存在。
- 煤体 /
- 脆韧性变形 /
- 识别标志
Abstract: Based on the investigation of coal deformation characteristics under microscopic scale (optical microscope and scanning electronic microscope)in laboratory,coal brittle ductile deformation is identified in this paper.During geological history,coal suffered from brittle to brittle ductile and ductile deformation under the conditions of tectonic stress field.Griffith Cracks or fractures are formed as a result of brittle deformation.Brittle ductile deformation is an intergrading style.Typical coal ductile deformation is concentrated in the mylonitic coal.Almost all characteristics of ductile deformation in rocks are identified in coal,expect for recrystallization.
- coal /
- brittle ductile deformation /
- microscopic identification