园子沟矿首采工作面“三带”分布及矿压显现规律研究

Study on the distribution of"three zones"and overlying strata movement in the first mining face of Yuanzigou Mine

覆岩运移范围及运移规律是指导工作面生产的重要依据,本文围绕园子沟煤矿首采工作面具体工程地质条件,采用钻孔电视法及理论分析对其覆岩运移范围的上下界限进行了研究。研究结果表明:裂隙带发育顶部高度距煤层顶板253.34 m,约为煤层厚度的23.68倍,而控制工作面矿压显现的关键层位为22.15 m厚的砂岩;工作面布置方向上平均来压步距和最大来压步距整体分布较为一致,中间略小于两侧,工作面推进方向上来压较为同步。研究结果对保障工作面安全生产具有重要的理论价值和实际意义。

The migration range and law of overburden rock is an important basis for guiding the production of working face.Based on the specific engineering geological conditions of the first mining face in yuanzigou coal mine,the upper and lower limits of the migration range of overburden rock are studied by using borehole television method and theoretical analysis.The research results show that:the top height of fracture zone is 253.34m from the coal seam roof,which is about 23.68 times of the coal seam thickness,and the key stratum controlling the strata behavior of the working face is the sandstone with the thickness of 22.15m;the average weighting step and the maximum weighting step are distributed uniformly in the layout direction of the working face,and the upward pressure in the advancing direction of the working face is relatively synchronous.The research results have important theoretical value and practical significance to ensure the safety production of working face.