Influencing mechanism of gully terrain on ground pressure behaviors in shallow seam longwall mining
Abstract：According to the problem of strong ground pressure behaviors when working face＇ s crossing gully terrain at Huojitu Coal Mine in Shendong mining area, measurements in situ, theoretical analysis and simulation experiment were adopted to study the influencing mechanism of gully terrain on ground pressure behavior in shallow seam mining. The result shows that instant descending of support column and roof cutting or caving appears frequently during uphill of gully terrain in shallow seam. Loss of primary key stratum due to being eroded in gully terrain area results in the dele- tion of horizontal side force during uphill of gully terrain, in which case the primary key stratum can not form stable voussoir beam structure and slides instability. And the lower single key stratum slides instability because of the obvi- ously increasing load above, in which case the strong ground pressure behaviors occurs in working face. If primary key stratum is integrated in gully terrain area, there will be no strong ground pressure behaviors during uphill of gully ter rain. The research result serves as a guidance for prevention of strong ground pressure behaviors when crossing gully terrain at No. 21305 and No. 21306 working face in Huojitu Coal Mine.
Keywords：gully terrainshallow seamstrong ground pressure behaviorsstrata movementkey stratum
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 179-185 )