fire crack

From the viewpoint of genesis,the fractures related with coalfield fire area can been pided into three basic types: structure fracture,mining collapse fracture,combustion fracture,and five compound types.

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。