ISO 17892-4.2016规定了确定土壤粒度分布的方法。 ISO 17892-4.2016适用于在岩土工程勘察范围内，通过筛分、沉淀或两者的组合，对土壤试样的粒度分布进行实验室测定。 粒径分布是土壤最重要的物理特性之一。土壤分类主要基于粒度分布。土壤的许多岩土和水文地质性质与粒度分布有关。 粒度分布提供了基于离散粒度类别细分的土壤描述。每一类的大小可通过筛分和/或沉淀来确定。粗土通常通过筛分进行测试，但细土和混合土通常通过筛分和沉降的组合进行测试，具体取决于土壤的成分。 所述筛分方法适用于所有粒径小于125 mm的非胶结土壤。描述了两种沉淀方法:比重计法和移液管法。 注:ISO 17892-4.2016符合EN 1997-2规定的粒度分布测试要求。

ISO 17892-4.2016 specifies a method of determining the particle size distribution of soils. ISO 17892-4.2016 is applicable to the laboratory determination of the particle size distribution of a soil test specimen by sieving, or sedimentation, or a combination of both within the scope of geotechnical investigations. The particle size distribution is one of the most important physical characteristics of soil. Classification of soils is mainly based on the particle size distribution. Many geotechnical and geohydrological properties of soil are related to the particle size distribution. The particle size distribution provides a description of soil based on a subdivision in discrete classes of particle sizes. The size of each class can be determined by sieving and/or sedimentation. Coarse soils are usually tested by sieving, but fine and mixed soils are usually tested by a combination of sieving and sedimentation, depending on the composition of the soil. The sieving method described is applicable to all non-cemented soils with particle sizes less than 125 mm. Two sedimentation methods are described: the hydrometer method and the pipette method. NOTE ISO 17892-4.2016 fulfils the requirements of the particle size distribution testing in accordance with EN 1997-2.