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选取淮南矿区不同风化年限的煤矸石进行分层采样,通过对所采135份样品的粒组划分及保水性的定量测试,对比分析了表生作用下煤矸石块度分布特征及其保水性变化规律,为矿区煤矸石等充填复垦工程应用提供科学依据.结果表明:不同采样区和同一采样区不同暴露程度的煤矸石块度分布差别较大;所有采样区上层煤矸石小于2mm和2~10mm两个粒组质量百分比显著高于下层;随着风化年限的增加,各采样区煤矸石小于2mm粒组的质量百分比总体呈上升趋势;随着风化程度的增强,10~20mm和2~10mm块度及自然块度的煤矸石的保水性均逐渐提高,且同一采样区上层煤矸石保水性均高于下层,即表生作用下块度相同的煤矸石保水性的高低受其风化程度的影响;同一采样区10~20mm和2~10mm块度及自然块度煤矸石保水性依次增高,即煤矸石块度分布特征对其保水性具有显著影响,尤其小于2mm块度煤矸石对提高煤矸石的保水性至关重要,且二者存在良好的相关性.
Coal gangue with different weathered years in Huainan mining area was selected for stratified sampling. The grain size distribution and water retention of coal gangue collected from 135 samples were quantitatively tested. Which provided scientific basis for the application of coal gangue and other reclamation projects in mining area.The results show that the distribution of coal gangue varies greatly between different sampling zones and the same sampling zone.The coal gangue in the upper sampling zone is less than 2mm and 2 ~ The mass percentage of two pellets of 10mm was significantly higher than that of the lower one. With the increase of weathered years, the mass percentage of coal gangue less than 2mm in each sampling area showed an overall upward trend. With the increasing degree of weathering, 10-20mm and 2-10mm The water retention of the coal gangue with the same degree of blockiness and the natural blockiness gradually increases, and the water holding capacity of the upper coal gangue in the same sampling area is higher than that of the lower layer, that is, the degree of water retention of the gangue with the same blockiness under the superficial effect is affected by the weathering degree ; The same sampling area of 10 ~ 20mm and 2 ~ 10mm block size and natural block degree of coal gangue water retention in turn increased, that is, coal gangue block size distribution of its water retention has a significant impact, especially less than 2mm To improve the water retention is critical gangue, and there is a good correlation between the two of gangue.