潘谢矿区外围1煤底板工程地质类型分区

Engineering geological zoning of 1st coal mine floor in periphery area of Panxie mining area

为了提高潘谢矿区外围1煤层开采时的底板稳定性,统计分析了潘谢外围46个钻孔资料,采用Surfer和AutoCAD绘图软件,得到1煤底板到太原组1灰间地层总厚度等值线图、泥岩统计厚度等值线图、粉砂岩统计厚度等值线图、砂岩统计厚度等值线图以及砂岩比值等值线图。研究得出:研究区主要岩性组成为泥岩,西部地区有较大范围粉砂岩;大部分地区砂岩比值在0.04左右,砂岩含量较少。结合三角分类法,对研究地层进行了岩性组合特征分区,最终划分出砂岩—粉砂岩区、泥岩—粉砂岩区、粉砂岩—泥岩区、粉砂岩区和泥岩区5个区,并借此分析潘谢外围1煤底板的隔水能力,得出1煤底板在高压水源下易发生突水。

To improve the stability of floor when mining 1 st coal mine floor in periphery area of Panxie mining area ,46 borehole data sta-tistics has been computed. Utilizing Surfer and AutoCAD softwares, some contour graph of statistical thickness between 1st coal and 1st limestone layer has been made,which is aimed at mudstone,silty sandstone,sandstone and sandstone ratio. By the above work,it can be known that the main lithology of study area is mudstone and the western region has a large range of fine sandstone. The ratio of sand-stone in most area is about 0. 04,and the sandstone is less. Based on the method of triangle classification,the lithology combination fea-ture zoning was carried out. Finally, the study area are divided into five zones, which are sandstone-powder sandstone area, mudstone- powder sandstone area, silt-mudstone area, silt area and mudstone area. Therefore, the watertightness of 1 st coal floor of Panxie periphery was analysed. It is concluded that the water inrush is quite possible because the coal floor of 1st coal is under high pressure.