测定非饱和土壤的渗透系数在野外一般采用小井渗入法。常用的有卡明斯基、吉林斯基、涅斯捷罗夫等几种方法。原作者指出:水向土中渗透,由于上面的水力水头作用及土壤毛细水呈现的毛细负压力作用,水不仅垂直向下渗透,还向侧方渗流。有的方法中因没考虑毛细力的影响,在计算渗透系数时不可避免的会发生很大的误差。在工作中曾选择了几种类型的土壤,按照下述三种方法进行了多次的此较试验,并利 Determination of unsaturated soil permeability coefficient in the field generally use a small well infiltration method. Commonly used are Kaminski, Jillingski, Nesterov and several other methods. The original author pointed out that water infiltrates into the soil due to the above water head effect and the capillary negative pressure of capillary water, not only the vertical infiltration, but also the lateral seepage. In some methods, the influence of capillary force is not considered, and a large error inevitably occurs when calculating the permeability coefficient. Several types of soils have been selected for work, and many of these tests have been conducted according to the following three methods