ISO/TS 17892-12:2004 土工技术研究和试验 土壤的实验室试验 第12部分： 阿特贝而格极限值的测定

标准编号：ISO/TS 17892-12:2004

中文名称：土工技术研究和试验 土壤的实验室试验 第12部分： 阿特贝而格极限值的测定

英文名称：Geotechnical investigation and testing — Laboratory testing of soil — Part 12: Determination of Atterberg limits

发布日期：2004-10

标准范围

ISO/TS 17892-12:2004规定了测定土壤阿太堡极限的试验方法。阿太堡极限包括液限、塑限和收缩限。这些限制也称为一致性限制。本文件仅包括液限和塑限的测定。液限是土壤从液态变为塑性状态时的含水量。本文件描述了使用落锥法测定天然土壤样品或土壤样品的液限，其中0.4mm或最近的筛子上的材料已被清除。本标准采用了60 g/60°锥体和80 g/30°锥体，因为两个锥体给出的液限值基本相同。可采用其他锥形装置，前提是它们能给出与本文所述试验相同的结果。注:卡萨格兰德法是测定液限的另一种方法。经验表明，结果取决于操作员的表现和判断。此外，自1932年卡萨格兰德首次提出以来，卡萨格兰德型仪器和试验方法经历了许多微小但显著的变化。这些变化会导致根据试验确定的液限值出现差异。落锥法是确定土壤液限的首选方法。土壤的塑性极限是土壤塑性时的最低含水量。塑性极限的测定通常与液限的测定同时进行。我们认识到，测试结果取决于操作员的判断，结果会出现一些变化。阿太堡限值受试样氧化或其他变化的影响，这些变化是由于试样储存时间过长或以不合适的方式处理而导致的。这尤其适用于快速粘土、硫化物粘土和有机土壤。

ISO/TS 17892-12:2004 specifies methods of test for the determination of the Atterberg limits of a soil. The Atterberg limits comprise the liquid limit, plastic limit and shrinkage limit. These limits are also called consistency limits. This document covers the determination of the liquid limit and the plastic limit only.The liquid limit is the water content at which a soil changes from a liquid to a plastic state. This document describes the determination of the liquid limit of a specimen of natural soil, or of a specimen of soil from which material retained on a 0,4 mm or nearest sieve has been removed, using the fall-cone method. This standard has adopted both the 60 g/60° cone and the 80 g/30° cone as it has been shown that both cones give essentially the same value of the liquid limit. Other cone devices may be adopted provided they can be shown to give results equal to those obtained from the tests described herein.NOTE The Casagrande method is an alternative method for the determination of the liquid limit. Experience has shown that the results are subject to the performance and judgement of the operator. Moreover, the Casagrande type apparatus and test method have undergone many small but significant variations since it was first proposed by Casagrande in 1932. These variations give rise to differences in the values of the liquid limit determined from the test. The fall-cone method is the preferred method of determining the liquid limit of a soil.The plastic limit of a soil is the lowest water content at which the soil is plastic. The determination of the plastic limit is normally made in conjunction with the determination of the liquid limit. It is recognised that the results of the test are subject to the judgement of the operator, and that some variability in results will occur.The Atterberg limits are influenced by oxidation or other changes in the specimen, resulting from storing it too long or otherwise by treating it in an unsuitable way. This applies especially to quick clays, sulphide clays and organic soils.

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