内蒙古乌达煤田火区相关裂隙研究

Study on the fractures related with coalfield fire area in Wuda coalfield,Inner Mongolia

针对当前煤层自燃研究中的薄弱环节,以强化地质因素研究为切入点,选择内蒙古乌达石炭二叠系煤田为工作区,深入研究裂隙系统在煤田火区形成的点→线→面扩展演化动力学过程中所起的重要作用.从成因角度将与煤田火区相关的裂隙划分为构造裂隙、采动塌陷裂隙、燃烧裂隙等3种基本类型和5种复合类型.其中,构造裂隙对采动塌陷裂隙和燃烧裂隙具有控制作用,燃烧裂隙通常在构造裂隙和塌陷裂隙基础上发育,单独的燃烧裂隙少见.野外调查和高分辨遥感解译证实,乌达煤田火区分布在裂隙密度较大的区域,裂隙类型与火区类型具有良好的相关性.

Aimed at the weak points in spontaneous combustion research, strengthened the study of geology controlling factors, selected Wuda coalfield of Permo-Carboniferous system in Inner Mongolia as the working area, and studied thoroughly the fracture system which played an important role in the dynamic process of coalfield fire area formation based on the model of burning spot→fire line→fire area. From the viewpoint of genesis, the fractures related with coalfield fire area can been divided into three basic types： structure fracture, mining collapse fracture, combustion fracture, and five compound types. The basic style of the structure fracture controlls on the mining collapse fracture and combustion fracture, and the combustion fracture developes generally based on the structure fracture or mining collapse fracture, independent combustion fracture is rare. The field geological survey and high resolution remote sensing interpretation show that the coal fires in Wuda coalfield distribute in the area with a large density of fractures and the type of fractures has a good interrelation with the type of coalfield fire area.