Similarity simulation study on overlying rock migration law of the excavation of extra-thick coal seams
SHI Lian
Abstract：The movement of overlying strata of extra-thick coal seam will directly affect the safe and efficient mining.Taking Guojiahe Coal Mine as the research object,based on the systematic analysis of the geological conditions of the first mining face of the No.3 coal seam,the characteristics of overlying rock fracture and surface subsidence during the mining process of two adjacent fully-mechanized caving faces were studied.The research results indicate that under the support of coal pillars,the subsidence of the overlying rock layer in the middle of the working face is most significant compared to the two ends of the working face.As the deformation and instability of coal pillars in adjacent working face sections occur,when the arch structure of the overlying rock mass is damaged,the overlying rock layer will experience overall subsidence.The relevant research results will help promote the safe and efficient mining of the extra thick coal seam in Guojiahe Coal Mine.
Keywords：extra-thick coal seamfully-mechanized caving miningoverlying rock fracturesimilarity simulation
Publication Date：2023-12-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 69-76 )