翠屏山煤矿地质构造对煤层厚度影响的研究

GeologicalStructure and Its Impact on Coal Seam Thickness in Cuipingshan Coal Mine

翠屏山煤矿是全省标准化矿井,研究该矿地质构造特征及其对煤层厚度的影响作用,对今后的煤炭资源勘查和矿井生产具有一定的指导意义。在矿井地质工作的基础上,综合各类地质资料,揭示了翠屏山煤矿地质构造特征及其对煤层厚度的影响,结果表明:翠屏山煤矿地表为单斜构造,而深部为紧密褶皱和大幅度倒转褶曲,在燕山构造期形成了缓倾角断层和高角度逆冲断层;在燕山晚期和喜马拉雅早期形成了一系列高角度正断层。正断层的引张拖拽作用导致断层附近上、下盘煤层厚度变薄,逆断层的逆掩重叠或挤压聚集,形成厚煤带;在紧闭褶皱带内,由于煤层受到强烈的挤压而发生大规模的塑性流变,形成"藕断丝连"状煤层;在伏卧褶曲和倒转褶曲中,正常翼的煤层被挤压变薄而倒转翼的煤层较厚且稳定性较好。褶皱作用还出现"穿刺"现象,"穿刺"流变使煤层厚度变薄。褶皱构造和断裂双重构造使煤层常呈透镜状、藕节状、串珠状产出。

Cuipingshan coal mine is a mine of standardization. The study of the mine geological tectonic features and their influence on coal seam thickness has a certain guiding significance for future coal resources exploration and mining. On the basis of mine geology work, integrating various geological data, this paper reveals the geological structure characteristics of coal mine and its effect on coal seam thickness in Cuipingshan. The result shows that the surface of Cuipingshan coal mine seems monoclinal structure, but in the deep it is full of tight folds and significantly overturned folds. The small angle faults and reverse thrust faults with high angle were formed in the Yanshan tectonic period;and a series of high angle normal faults were developed in later period of Yanshan and early period of Himalayan. The effect of attraction, tension and dragging by the normal faults reduce the thickness of coal seam both in hanging wall and footwall which are around the faults. To the contrary, thrust overlap or extrusion aggregation of reverse faults lead to thick coal zones. The coal seam develops large-scale plastic flow and formed “the seemingly severed but actually connected＂ shape in coal seam because it has been squeezed strongly within the tight fold belt. Among the recumbent folds and overturned folds, normal wing seam becomes thinner for the squeezing and the overturned limb of the coal seam is normally thicker with good stability. ＂Puncture＂ phenomenon appears with folding action and the ＂puncture＂ flow reduces the thickness of the coal mine. The coal seam often presents lenticular, lotus and beaded shapes caused by the double structure of fold and fault.