中文摘要：

以陇东高原马兰黄土为对象，设计了现场毛细上升试验，将试验得到的黄土中毛细上升速率与基于非饱和黄土的土水特征曲线，与根据 Terzaghi 理论以及 Lu 等提出的方法计算得到的黄土中毛细上升速率进行了比较。结果表明：Terzaghi 理论由于将湿润峰处的渗透系数假定为饱和渗透系数，得到的结果偏大，而 Lu 等的方法考虑了土的非饱和渗透性，预测精度较高，在没有条件进行现场试验的情况下，可用于对黄土中毛细上升速率的估算。

英文摘要：

This study focused on the Malan loess on the Longdong Plateau. A field experiment was conducted in order to study the capillary rise, and the rate of capillary rise in the loess was obtained. According to Terzaghi’s theory and the estimation method proposed by Lu and Likos, the rate of capillary rise in the loess was calculated on the basis of the unsaturated soil-water characteristic curve, and was compared with the experimental value. The results show that the value obtained by Terzaghi’ s theory was larger because the permeability coefficient at the wetting front was presumed to be a saturated permeability coefficient. In contrast, the value obtained by the Lu and Likos method, which considered the unsaturated permeability of soil, had high prediction accuracy. It can therefore be used to estimate the rate of capillary rise in the loess if there is no access to a field experiment.