Discussion on Key stratum distinguishing method of overlying strata based on the thin slab theory
QIN Wei
XU Jia-lin
Abstract：The limitations of key stratum distinguishing method based on the thin slab theory and the relationship be-tween the width of working face and the key stratum distinguish were analyzed. The result shows that the breaking or-der of hard strata is decided by the span criterion of hard strata and it is not relate to the width of working face in gen-eral case. So using the thin slab model or clamped-clamped beam model has no effect to the distinguishing results of the key stratum. The geometry size of hard strata is not always accord with the definition of the thin slab model. And the key stratum distinguishing method based on the thin slab theory should consider the width of working face. If the width of working face is less than the span criterion of the overlying hard strata, hard strata will not break, the interval of roofing breaking of hard strata can not be obtained ,the position of key stratum can not be determined by comparing the interval of roofing breaking of hard strata.
Keywords：thin slab modelkey stratumdistinguishing methodthe width of working faceclamped-clamped beam model
Publication Date：2010-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 194-197 )