前 言 在水文地质的调查中,渗透系数——“K”值是一个必须获得的数据。由于求渗透系数“K”所要求的精确程度不同,因而我们可以采用各种不同的方法。例如,如果我们所要求所得K值精确度很高,则可采用到野外去实地进行抽水与压水试验的方法,如要求的精确度不十分高,则可以采用经验公式计算的方法(即根据分析土的孔隙度与颗粒成份来计算)进行粗略的估计,这里,要注意的一点就是必须是在其原适用条件下,才可以应用经验公式。 Introduction In hydrogeological surveys, the permeability coefficient - the “K” value is a must-have data. Because of the different degree of precision required for the permeability coefficient “K”, we can use a variety of different methods. For example, if the accuracy of the K values ​​we request is very high, a field pumping and water pressure test can be used in the field. If the required accuracy is not very high, then the empirical formula can be used Analysis of soil porosity and particle composition to calculate) a rough estimate, here, it is important to note that it must be in its original application of conditions before the empirical formula can be applied.