Research On Coordination And Damage-Reduction Mining Technology Under Thick Loose Strong Aquifer Of Barapukuria Coal Mine

In Bangladesh Barakupuria Mine(referred Barapukuria Coal Mine), surface is covered with more than 100 meters thick loose strong aqueous layer Upper Dupi Tila. Except Lower Dupi Ti La relatively impermeable outer layer, basically there is no impermeable rock in overlying rock. For mine production safety, not only overburden crevice belt can not affect the Upper Dupi Tila aquifer, but also the complete impermeability of Lower Dupi TiLa impermeable layer should be guaranteed. Based on the analysis of the specificity of Barapukuria Coal Mine geological and mining conditions, applying of theoretical calculations, numerical simulation analysis, on-site detection analysis and other methods, coordination derogation mining techniques under strong aqueous soil layer in Barapukuria Coal Mine are in-depth study and coordination impairment mining method suitable Barapukuria Coal Mine geological and mining conditions is given.Through an analysis on the geological and mining conditions of Barapukuria coal mine, the Upper Dupi Tila thick loose strong aquifer is determined to be the main factor threatening the safe exploitation of coal mine, and to protect the water resistant capacity of Lower Dupi TiLa from damaged by coordination mining is the critical technology of the mining under water body of Barapukuria coal mine. Secondly, the theoretical implications and damage-reduction principle of coordination mining are interpreted by theoretical analysis, and the boundary staggered distance layout is given out. This results in the segmental damage and release of sandstone failure of coal VI roof, effectively controlling the height of mining water flowing fractured zone, reducing the superposition of mining boundary deformation and the degree of deformation and destruction of the Lower Dupi TiLa relative water resisting layer, alleviating the threat degree of impulsion pressure disaster. The calculating procedure of slicing boundary coordination staggered distance is assigned through probability integral method combined with surface subsidence observation data. The numerical simulation result shows that, the slicing coordination staggered distance layout has an obvious effect on the stress of boundary and coal pillar, and can effectively reduce the degree of impulsion pressure disaster, and can prevent the Lower Dupi Ti La relative water resisting layer against water flowing fractured zone, as well as can guarantee the safety mining under Upper Dupi Tila water body. The surface subsidence observation data calculation shows that, the boundary coordination staggered distance layout can effectively reduce the degree of deformation and failure of Lower Dupi TiLa relative the water layer. The coordination and damage-reduction mining technology under the thick loose strong aquifer of Barapukuria coal mine is finally assigned through comprehensive analysis.Research laid the foundation for further research especially thick coal seam overburden damage rule. This has a certain reference value for the development of comprehensive coordination derogation scheme under Bangladesh Balarpukulia Coal mining water body.