浅埋煤层关键层研究

根据浅埋煤怪的特点，提出了覆岩全厚整体台阶切落的判断公式，补充了关键层理论在浅埋煤层应用中的判定准同。分析了不同覆岩岩层关键层的层位，指出地表厚松散层浅埋煤层覆岩中两层坚硬岩层均为关键层，为其长壁工作面来压剧烈的原因提出了供理论依据。

Study on key stratum in shallow seam

Based on the features of the shallow seam, formula for determining the integral breaking of the whole overlying strata is proposed. The supplement and perfection of the criterion for determining the key stratum in shallow seam are given. Position of the key stratum in different overlying strata is analyzed. It is pointed that two hard stratums in overlying strata of shallow seam with thick loose sand bed are both the key seams, and provides the basis of intense roof weighting at long wall faces.