论文部分内容阅读
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。
The water-holding characteristics of soil samples with different particle sizes were tested. The soil-water characteristic curve and hysteresis during moisture absorption and desorption were analyzed to investigate the effect of particle size on soil water holding capacity. The soil-water characteristic curve model of D.G.Fredlund and A.Xing was used to fit the test data, and the quantitative relationship between model fitting parameters and soil-water characteristic curve parameters was obtained. The results show that the parameter a increases linearly with the intake value, the parameter m decreases with the increase of the residual substrate suction, and the parameter n also decreases with the increase of the dehumidification rate. With the increase of effective particle size, the values of inlet air, water inflow and residual substrate suction decrease linearly in the semi-logarithmic coordinates, and the dehumidification rate increases quadratically. The hysteresis effect decreases with the increase of the effective particle size, and also decreases with the increase of the slope of the cumulative curve of particle size gradation.