ISO 14688-2:2017规定了工程用土壤最常用材料特性分类的基本原则。本手册将与ISO 14688？1一起阅读，ISO 14688？1给出了土壤识别和描述的规则。相关特征可能会有所不同，因此，对于特定项目或材料，可以对描述性和分类术语进行更详细的细分。由于当地地质条件的差异，采用了提高相关分类标准的做法。 本文件中确立的分类原则允许根据现场和实验室试验结果，将土壤分为具有类似成分和岩土性质的组，以确定其是否适用于岩土工程目的。 ISO 14688-2:2017适用于原位天然土壤、人工改造的天然土壤和合成材料。 EN 16907-2中给出了土方工程专用的更详细分类。 注1:ISO 14689涵盖了岩石的识别和描述。使用ISO 14688-1、本文件和ISO 14689（视情况而定）中的程序识别和描述土壤和岩石之间的中间材料。 注2:ISO 25177涵盖了土壤学用途的土壤识别和分类，以及土壤保护和污染区域修复测量框架内的土壤识别和分类。

ISO 14688-2:2017 specifies the basic principles for classification of those material characteristics most commonly used for soils for engineering purposes. It is intended to be read in conjunction with ISO 14688？1, which gives rules for the identification and description of soils. The relevant characteristics could vary and therefore, for particular projects or materials, more detailed subdivisions of the descriptive and classification terms could be appropriate. Due to differences in local geological conditions, practices to enhance relevant classification criteria are used. The classification principles established in this document allow soils to be classified into groups of similar composition and geotechnical properties, based on the results of field and laboratory tests with respect to their suitability for geotechnical engineering purposes. ISO 14688-2:2017 is applicable to natural soil in situ, natural soil reworked artificially and synthetic materials. A more detailed classification specific to use in earthworks is given in EN 16907？2. NOTE 1 Identification and description of rocks are covered by ISO 14689. Identification and description of materials intermediate between soil and rock are carried out using the procedures in ISO 14688？1, this document and ISO 14689, as appropriate. NOTE 2 The identification and classification of soil for pedological purposes, as well as in the framework of measurements for soil protection and for remediation of contaminated areas, is covered by ISO 25177.