Aiming at the reasonable malposition of extreme extreme close coal seam when combined mining under the condition of the composite roof of the Daanshan coal mine,the upper and lower coal seam of shaft 10 slots located in the +400 m level of Daanshan Coal Mine was selected to study the malposition of extreme close coal seam when combined mining under the condition of the composite roof.The results show:under the condition of stratified mining,when the upper layer is mined, after undergoing the process of "extrusion-unloading-support support extrusion and moving frame two times unloading".A large number of cracks will be generated in the gangue, and the degree of fragmentation will increase. Moreover, the smaller the malposition between the upper and lower working faces is, the more serious the damage is.The reasonable malposition of the upper and the lower seam of the shaft 10 in the +400 m level is 20m. Selecting the DW14-300 / 100X type single prop to support the composite roof will make the support effect good.,Which can ensure the safety production of the working face.The research results provide experimental and theoretical basis for the stability of the working faces when combined mining in the extremely close distance coal seam.
|Affiliation of speaker||Иркутский национальный исследовательский технический университет|
|Position of speaker||?|