【摘要】 对比分析2种基于统计模型预测非饱和土渗透系数的方法(Kunze法与Fredlund法),得出:2种方法本质相同,仅选取的积分限和积分变量形式不同,是对同一问题的2种不同表述。对其简化计算方法中各参数的选取进行深入分析,结果表明:分段数m取值介于15~50时较为合理,且Fredlund方法中取ln(1 000 000)(假定残余含水率为0)为积分上限、进气值的对数为积分下限,理论上会使预测结果偏大。当接近饱和含水率时,非饱和渗透系数随含水率的变化较为敏感,当接近残余含水率时,渗透系数变化率很小且差异性趋于不明显。更多还原

【Abstract】 By comparing and analyzing two methods( Kunze’s method and Fredlund’s method) based on statistical models to predicting the hydraulic conductivity of unsaturated soils,we found that they are exactly the same in essence just with different limits of integration and integration variable forms. Moreover,by analyzing the selection of parameters in their simplified calculation we obtain that it is more reasonable to determine the value of m within15- 50. Theoretically the prediction result will be larger if ln( 1000000)( residual water content is assumed to be0) is taken as the integration upper limit and logarithm of air-entry value as the integration lower limit in Fredlund method.更多还原