环境修复
赵亮,唐泽军,刘芳.粉煤灰改良沙质土壤水分物理性质的室内试验[J].环境科学学报,2009,29(9):1951-1957
粉煤灰改良沙质土壤水分物理性质的室内试验
- Laboratory tests of fly ash as a sandy soil amendment and its effects on soil water
- 基金项目：国家重点基础研究发展计划(973)项目(No.2007CB407207)
- 作者
- 单位
- 赵亮
- 中国农业大学水利与土木工程学院, 北京 100083
- 唐泽军
- 中国农业大学水利与土木工程学院, 北京 100083
- 刘芳
- 甘肃联合大学经济与管理学院, 兰州 730000
- 摘要：通过大量的土柱积水入渗试验,研究了粉煤灰改良沙质土壤水分物理性质的效果.同时,试验还通过在沙土表层不同深度(10、20、30cm)施加不同施用率(10%、20%、30%、40%)的粉煤灰,对比研究了土壤水分物理性质的变化情况.结果表明,沙质土壤中施加粉煤灰可以有效地减小土壤入渗能力,减小湿润锋的下移速率,增强沙土持水性.在0～30cm施用深度,4种处理条件下湿润锋下移30cm所需的时间分别是对照试验的7～19倍,而且4种处理末端推进速率较对照试验均减小了90%以上.粉煤灰土壤改良层中含水率较沙土有明显提高,有效水分滞留时间显著增加.
- Abstract：The effects of fly ash as sandy soil amendment on the physical properties of soil water were tested by measuring the accumulated water infiltration in the soil. These treatments involved four different fly ash quantities(10%,20%,30%,40%) and 3 application depths(10 cm,20 cm,30 cm). Applying fly ash to sandy soil effectively reduced infiltration and increased soil water retention. Compared to the control experiment,regardless of application depth,the total time of wetting for every treatment increased by 7～19 times,and the final velocity of the wetting front decreased by 90%. In addition,the water content of the soil profile was higher than in the control experiment and the retention time of water in the soil increased significantly.
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