一种测定非饱和土-水力学参数的方法

A method for determining hydraulic parameters of unsaturated soils

详细介绍了非饱和土-水力学参数联合测试系统,该系统分别利用轴平移技术和达西定律测定非饱和土土-水特征曲线和水相渗透系数。通过试验结果对比可以发现,由联合测试系统确定土-水特征曲线与压力板仪溢出水校正称量法确定的土-水特征曲线接近,但由联合测试系统确定的试样残余含水率比使用压力板仪溢出水校正称量法确定的试样含水率要小;由联合测试系统确定的渗透函数,当饱和度较大时,实测值与模型预测值较为接近;当饱和度较小时,实测值与模型预测值相差较大。

A combined system for concurrently measuring the hydraulic properties of unsaturated soils is introduced in detail.The axis translation method and the Darcy＇s law are adopted to determine the soil-water characteristic curve and the hydraulic conductivity function.By comparing the measured data,it is shown that the difference of the soil water characteristic curves determined by the laboratory combined system;and the adjusted method of weighing soil in the pressure plate extractor is small;but the residual water content determined by the combined system is less than that determined by the adjusted method of weighing outflow.In addition,it is shown that the measured value of the hydraulic conductivity is close to the computed value of that when the saturation is large.However,the difference between the measured value and the computed value is large when the saturation is small..