摘 要：为解决泥沙颗粒分析工作中出现的没有按照级配曲线的适 用性来表达和计算有关特征值给成果质量产生的影响，通过理论分 析和研究，论述了不同种泥沙颗粒级配曲线的适用性与有关特征值 之间的关系，同时还介绍了一种新的泥沙颗粒级配曲线绘制方法。泥 沙颗粒级配曲线的绘制有多种方法，每种级配曲线有其特点和严格 的适用性；国家分析室应选择半对数坐标系级配曲线；分组法计算泥 沙样品各组平均粒径，应采用每组上下限与其几何均值的和的加权 平均值。 

关键词：泥沙颗粒级配曲线；最大粒径；最小粒径；中值粒径；平均粒 径；非均匀系数

Abstract:In orderto solve the influences of relevantcharacteristic values expressed and calculated according to the suitability of sedim ent grading curve in the analysis of sedim ent grain on the quality of results from the analysis, the relationship between the suitability of different sedim ent grading curves and theirrelevantcharacteristic values through a theoretical analysis and study were discussed ，and a new m ethod to plota sedim ent grading curve was also presented.There is a variety of plotting sedim ent grading curve, each grading curve has its feature and strict suitability. State-owned analysis lab should selecta sem i-logarithm coordinate system to plotgrading curve；when average grain size over each group ofsam pling sedim entis calculated by grouping m ethod,a weighted m ean value ofup per and lower lim its ofsam pling sedim ents within the each group and its geom etric m ean valuesshould be adopted.

Keywords:sedim entgrading curve；m axim um grain size；m inim um grain size；m edian grain size；average grain size；heterogeneouscoefficient