粒度分析中级配指标的探讨

Discussion of Grading Index When the Grading Curve Corresponding with Normal Distribution

针对天然土中粒径分布大多符合对数正态分布这一事实，在土粒级配曲线近似为正态分布这一前提下，探讨了目前广泛采用的粒度分析中级配指标的物理意义及其存在的问题，并提出了划分有效粒径的方法．

In accordance with the effective size of nature soil conforming wostly with normal distribution, the physical signification and existing problem on the grading index of the soil grain are discussed. On the premise that the grading curves of soil grain are similar to the cure of normal distribution the method to delimiting effective size is presented.