| 刘奉银,张昭.增湿路径对非饱和土水气渗透系数的影响研究[J].水利学报,2008,39(8): |
| 增湿路径对非饱和土水气渗透系数的影响研究 |
| Study on effect of infiltration paths on water_air permeability coefficients in unsaturated loess |
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| DOI： |
| 中文关键词: 黄土 非饱和土 渗透 渗气 增湿路径 |
| 英文关键词: loess unsaturated soil water_air infiltration permeability coefficient infiltration path |
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| 摘要点击次数: 2164 |
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| 中文摘要: |
| 对水气运动联合测定的方法，提出了3种渗水稳定时间判定方法及3种渗水驱动势的计算方法。对同一干密度的试样，进行不同增湿路径的渗透试验，分析了不同的渗水稳定时间判定方法、渗水驱动势计算方法对渗水系数的影响，得出考虑渗水驱动势随时间变化的变水头计算方法最为合理和稳定。进而以变水头计算方法为基础，分析了增湿路径对水气渗透系数测定值的影响。结果表明，增湿路径对渗水系数的影响总体不大，而在较高饱和度范围内对渗气系数的影响较大。 |
| 英文摘要: |
| Three methods for determining the time of stable moisture transfer and three methods for calculating the seepage force are suggested. At the same time, the infiltration test for loess specimens with the same dry density experienced different infiltration paths is carried out. The effect of time for stable moisture transfer and calculation method for seepage force on permeability coefficient is analyzed according to the data of test. The result shows that the calculation method using varying water head and taking the time_variation of seepage force into account is the most stable and best method. On this basis, by applying the method using varying water head the effect of infiltration path on water_air permeability coefficient is analyzed. The result shows that the water_air permeability coefficient is not significantly affected by the infiltration path, but it can not be neglected if the saturation of loess is high. |
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