陕北浅埋矿区煤层顶板含水层富水成因研究

Study on the causes of water abundance of coal seam roof aquifer in shallow-buried mining area of northern Shaanxi

为了查清陕北浅埋矿区工作面涌水量差异巨大的原因,从地形地貌、风化基岩厚度、含水层富水性、井下涌水等方面,开展了煤层顶板含水层富水成因研究。结果表明:作为煤层开采最主要充水含水层的风化基岩,其富水性强弱主要受地貌控制;风化基岩富水性强弱与风化基岩厚度没有直接关系;在风化基岩提供储水空间的基础上(空间条件),第四系厚度较大、富水性较好的区域(水源条件),可以形成富水性较好的风化基岩含水层区域,该区域煤炭开采过程中,会产生较大采空区涌水。

In order to find out the causes for the large difference of water inflow from the working face in the shallow-buried mining area in northern Shaanxi,a study on the causes of water abundance in the coal seam roof aquifer is carried out from the aspects of topography features,weathered bedrock thickness,water abundance in the aquifer,and underground water inflow.The results show that as the main water filled aquifer weathered bedrock in coal seam mining,the water abundance of the weathered bedrock is mainly controlled by the topography features,and is not directly related to the thickness of weathered bedrock;on the basis of water storage space(space conditions)provided by the weathered bedrock,the area with large Quaternary thickness and good water abundance(water source conditions)can form a weathered bedrock aquifer area with good water abundance,and during the coal mining process in this area,large water inrush from the goaf will occur.