Abstract:
According to the problems of roof water disaster, rock burst, and spontaneous combustion of a coal seam in the Barapukuria coal mine of Bangladesh, this paper analyzes the geological characteristics of “three thick, two hard and one strong” and the disaster conditions of the water disaster in the UDT strong water-bearing sand layer, the strong impact disaster of thick and hard roof fracture and the spontaneous combustion of residual coal in thick seam multi-layered mining goaf.On the basis of the disaster control conditions of the water-resisting performance of the LDT aquifuge and the stability of key strata of overburden structure, the theory of layered coordinated disaster reduction mining in a thick coal seam is put forward.Based on the theory and principle of coordinated disaster reduction mining, the mining mode of layered coordinated disaster reduction in the thick coal seam of Barapukuria coal mine is proposed.Also, the multi-disaster source prevention and control technology system of roof water disaster upper protection and lower drainage, dynamic and static transfer of rock burst and space-time adaptation of spontaneous combustion fire is constructed.The multi-layered safe mining of the thick coal seam in Barapukuria coal mine is realized.Through the application and practice in the Barapukuria coal mine, it shows that the thick seam slicing and thickness limiting mining can make a full use of the disaster control mechanism of overburden structure, and avoid the whole fracture and impact disaster of the thick and hard roof.The thick coal seam layered coordination staggered layout mining method can disperse and transfer the high stress at the boundary of the thick coal seam, avoid the superimposed damage of overlying rock stretching area, and effectively protect the integrity and water resistance of aquiclude.The thick coal seam slice overall staggered distance coordinated mining method can effectively release the coal pillar stress in the upper slice goaf, realize the rapid settlement of the whole overburden, compact the gap in the overburden fracture zone, and reduce the risk of spontaneous combustion in the goaf.Under the condition of multi-disaster superimposed mining, the application of coordinated disaster reduction mining method can control the disaster intensity from the source, combined with conventional disaster prevention methods, it can play a more obvious role on disaster prevention.