摘要进行不同粒径土样的持水特性试验，对吸湿与脱湿过程中的土–水特征曲线与滞后现象进行分析，探讨粒径对土持水性能的影响。利用D. G. Fredlund和A. Xing的土–水特征曲线模型对试验数据进行拟合，得到模型拟合参数与土–水特征曲线参数的定量关系。结果表明：参数a与进气值呈线性增加趋势，参数m随着残余基质吸力的增大而减小，参数n也随着减湿率的增大而减小。随着有效粒径的增大，进气值、进水值、残余基质吸力在半对数坐标上均随之呈现线性减小，减湿率呈二次函数增长。滞后效应随着有效粒径的增大而减小，同样随着粒径级配累积曲线斜率的增大而减小。
Abstract：The water retention of soils with different particle sizes was investigated to analyze the influence of particle size on the soil water characteristic curve(SWCC). The test data were best-fitted using the D. G. Fredlund and A. Xing equations. The obtained fitting parameters and hysteretic behavior were discussed and correlated with grain-size distribution parameters. The results show that the fitting parameter，a，increases linearly with the increasing of the air-entry value of the SWCC and that the fitting parameters，m and n，decrease with the increasing of the residual suction and slope of the SWCC respectively. The coarse-grained soil has the lower air-entry value，residual matric suction and water-entry value and less hysteresis than a fine-grained soil. Moreover，the slope of the drying SWCC increases with the increasing of particle size of soil. The hysteresis decreases with the increasing of particle size together with the slope of the grain size distribution curve of the soils.
田湖南，孔令伟. 细粒对砂土持水能力影响的试验研究[J]. 岩土力学，2010，31(1)：56-60.(TIAN Hunan，KONG Lingwei. Experimental research on effect of fine grains on water retention capacity of silty sand[J]. Rock and Soil Mechanics，2010，31(1)：56-60.(in Chinese))
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2016, Vol. 35 
