芦岭煤矿10#煤层顶板特征

利用钻孔资料，统计芦岭煤矿10#煤层顶板30m以内砂岩和直接顶的厚度。依据硬质岩石质量分数、直接顶厚度与采高的比值（Km）分析顶板的岩性类型和顶板的结构类型。结果表明：1”煤层顸板岩体岩性分为硬质岩体、中硬岩体和软质岩体三类，分别约占矿区的50％、35％、15％；顶板结构类型为老顶直接覆盖型、伪顸＋老顶型、直接顶＋老顶型和伪顶＋直接顶＋老顶型四种；顶板工程地质类型分为无周期来压、有周期来压和周期来压强烈三种，依次占矿区的49％、50％、1％。该矿地质条件较好，研究结果为矿区工作面布置方法、顶板支护方式的选择提供了依据。

No. 10 coal seam roof characteristics in Luling coal mine

This paper draws on borehole core data, offers estimates of sandstones occurring within 30 m from roof in the Luling coal mine No. 10 seams and immediate roof thickness, and analyzes coal roof li- thology and structural types according to hard rock percentage and immediate roof thickness/shear height ratio（K,n）. The result shows that the coal roof lithology of No. 10 can be divided into three kinds of hard, medium and soft rock masses, accounting for about 50% , 35% , 15% of the mining area respectively; the coal roof structural types are divided into four kinds, such as the main roof cover type, the false roof and main roof, the immediate roof and main roof type and the false roof and immediate roofs; the engi- neering geological type of the roof are divided into three kinds： no periodic weighting roof, periodic weighting roof and strong periodic weighting roof, accounting for about 49% , 50% , and 1% of the min- ing area respectively. The coal mine is blessed with a better geological condition and the study serves as a basis for developing layout methods and selecting roof supporting pattems for working faces.