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根据大量钻探及井下采掘揭露资料,探讨了下峪口煤矿2号煤层的赋存特征,分析表明2号煤属不稳定薄煤层,煤层总体厚度呈NE—SW向薄厚交替变化特点,区内可划分为两个相对的厚煤带和两个薄煤带。煤体结构以碎裂煤为主,兼有少量的糜棱煤及碎粒煤,,煤层顶以粉砂岩与砂岩顶板为主。通过对2号煤厚度变化分析,认为沉积环境、河流的同生冲刷及构造挤压是影响厚度变化的三个主要因素。
Based on the data of a large number of drilling and underground excavations, the occurrence characteristics of No. 2 coal seam in Xiayukou coal mine are discussed. It is indicated that No. 2 coal is unstable thin coal seam. The overall thickness of coal seam shows an alternation of NE-SW thickness and thickness. Divided into two relatively thick coal and two thin coal belts. The structure of coal is mainly fragmented coal, with a small amount of mylonitized coal and crushed coal, and the top of the coal seam is dominated by siltstone and sandstone roof. Based on the analysis of the change of No.2 coal thickness, it is concluded that the depositional environment, the ebb and flow of the rivers and the tectonic extrusion are the three main factors that affect the thickness variation.